CN113495239B - Imaging method, device and system of medical image - Google Patents

Abstract

The present application relates to a medical image imaging method, device and system. The method includes: acquiring positioning data sent by a positioning sensor; the positioning sensor is used for real-time monitoring of the position of the inspected part, and the positioning data includes the current physical location of the inspected part. Coordinates; calculate the physical position offset of the inspected part according to the current physical coordinates and the initial physical coordinates; determine the inspected part according to the current physical coordinates and the rotation matrix between the physical coordinate system and the logical coordinate system in the magnetic resonance imaging system The current logical coordinates of Medical images are generated from the reacquired medical imaging data. This method can greatly reduce the generation of artifacts in medical images.

Description

Imaging method, device and system for medical images

technical field

The present application relates to the field of computer technology, in particular to a medical image imaging method, device, and system.

Background technique

In the current medical field, the magnetic resonance imaging (Magnetic Resonance Imaging, MRI) system is widely used in the analysis of clinical lesions due to its advantages of high-resolution images, multi-directional thin-layer scanning, and high diagnosis rate for difficult diseases. During the MRI scanning process, for example, scanning the subject's head, the subject's mental stress or other physiological activities will cause the head to move, which will cause artifacts in the MRI image and affect the doctor's reading result. Therefore, in order to improve the accuracy of doctor's reading results, artifacts in MRI images should be minimized.

In the traditional technology, the subject's head is usually fixed with mechanical parts to reduce the subject's head movement, so as to achieve the purpose of reducing artifacts in the magnetic resonance image.

However, the use of mechanical fixation in traditional techniques may cause discomfort to the subject, making the subject resist physically or psychologically more nervous, and thus cause more serious artifacts in the magnetic resonance image.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide an imaging method, device and system for medical images to solve the problem that the subject may be uncomfortable due to mechanical fixation in the traditional technology, resulting in more serious artifacts in the magnetic resonance image.

An imaging method of a medical image, the method comprising:

Obtain the positioning data sent by the positioning sensor; the positioning sensor is used to monitor the position of the inspected part in real time, and the positioning data includes the current physical coordinates of the inspected part;

Calculate the physical position offset of the inspected part;

Determine the current logical coordinates of the inspected part according to the current physical coordinates and the rotation matrix between the physical coordinate system and the logical coordinate system in the magnetic resonance imaging system;

Calculate the logical position offset of the inspected part according to the current logical coordinates;

Based on the physical position offset and the logical position offset, it is judged whether the medical imaging data needs to be re-acquired, and if so, a medical image is generated according to the re-acquired medical imaging data.

In one of the embodiments, judging whether to re-acquire medical imaging data based on the physical position offset and the logical position offset includes:

If the physical position offset is greater than a preset first threshold, and/or the logical position offset is greater than a preset second threshold, it is determined that medical imaging data needs to be re-acquired.

In one of the embodiments, the above method also includes:

If the medical imaging data does not need to be re-acquired, determine the time period corresponding to the acquisition of the positioning data;

Motion compensation is performed on the medical imaging data collected during the time period, and a medical image is generated by using the motion-compensated medical imaging data.

In one of the embodiments, motion compensation is performed on the medical imaging data collected during the time period, including:

According to the current logical coordinates and the initial logical coordinates, calculate the coordinate variation of the inspected part in different directions of the logical coordinate system;

Weighted addition/subtraction is performed between the coordinate variation and the medical imaging data collected within a time period to perform motion compensation.

In one of the embodiments, the above method also includes:

The medical image to be quantified is generated by using the medical imaging data before motion compensation, and the medical image to be quantified is quantified under the preset image quality index to obtain the quantified result;

According to the physical position offset, the logical position offset and the quantitative result, the relationship between the displacement offset and the quality of the medical image in the current acquisition mode is obtained.

In one of the embodiments, the above method also includes:

Determine the first pressure coefficient of the positioning airbag according to the physical position offset and the logical position offset, and send the first pressure coefficient to the inflator corresponding to the positioning airbag; wherein the positioning airbag is used to fix the position of the inspected part.

In one of the embodiments, the above method also includes:

The second pressure coefficient input by the user is received, and the second pressure coefficient is sent to the air pump corresponding to the positioning airbag.

An imaging device for medical images, the device comprising:

The obtaining module is used to obtain the positioning data sent by the positioning sensor; the positioning sensor is used to monitor the position of the inspected part in real time, and the positioning data includes the current physical coordinates of the inspected part;

The first calculation module is used to calculate the physical position offset of the inspected part;

The second calculation module is used to determine the current logical coordinates of the inspected part according to the current physical coordinates and the rotation matrix between the physical coordinate system and the logical coordinate system in the magnetic resonance imaging system; calculate the current logical coordinates of the inspected part according to the current logical coordinates logical position offset;

The imaging module is configured to judge whether the medical imaging data needs to be re-acquired based on the physical position offset and the logical position offset, and if so, generate a medical image according to the re-acquired medical imaging data.

An imaging system for medical images, the system includes: magnetic resonance equipment and computer equipment; the magnetic resonance equipment includes a head coil, the inner surface of the head coil is provided with a telescopic structure, and the free end of the telescopic structure is connected to a positioning sensor, and the telescopic structure drives positioning The sensor is close to or far away from the tested part;

The positioning sensor is used to monitor the position of the inspected part in real time, and send the monitored positioning data to the computer equipment; the computer equipment is used for:

Obtain the positioning data sent by the positioning sensor, and the positioning data includes the current physical coordinates of the inspected part;

Calculate the physical position offset of the inspected part;

Determine the current logical coordinates of the inspected part according to the current physical coordinates and the rotation matrix between the physical coordinate system and the logical coordinate system in the magnetic resonance imaging system;

Calculate the logical position offset of the inspected part according to the current logical coordinates.

In one of the embodiments, the telescopic structure includes one or more positioning airbags, and the positioning airbags are driven by an air pump;

The computer device is also used to control the inflator to adjust the pressure of the positioning air bag based on the received pressure coefficient.

The imaging method, device and system of the above medical image can obtain the positioning data sent by the positioning sensor; the positioning sensor is used to monitor the position of the inspected part in real time. Since the positioning data includes the current physical coordinates of the inspected part, it can be used according to the current The physical coordinates calculate the physical position offset of the inspected part; and determine the current logical coordinates of the inspected part according to the current physical coordinates and the rotation matrix between the physical coordinate system and the logical coordinate system in the magnetic resonance imaging system; and then according to the current The logical coordinates calculate the logical position offset of the inspected part; based on the physical position offset and the logical position offset, it is judged whether the medical imaging data needs to be re-acquired, and if so, a medical image is generated according to the re-acquired medical imaging data. In this method, it is not necessary to use a mechanical fixation method to fix the inspected part of the subject, but to monitor the position of the inspected part through a positioning sensor, which has no restraint on the subject and will not cause the It can greatly reduce the possibility of serious artifacts; and determine whether it is necessary to re-acquire medical imaging data by judging the physical position offset and logical position offset of the inspected part. Artifacts in medical images can be further reduced by reacquiring medical imaging data during large movements.

Description of drawings

Fig. 1 is a schematic structural diagram of an imaging method application system for medical images in an embodiment;

Fig. 2 is a schematic flow chart of a medical image imaging method in an embodiment;

Fig. 3 is a schematic flow chart of a medical image imaging method in another embodiment;

Fig. 4 is a schematic flowchart of a medical image imaging method in yet another embodiment;

Fig. 5 is a schematic diagram of the process of the imaging method of the entire medical image in an embodiment;

Fig. 6 is a structural block diagram of an imaging device for medical images in an embodiment;

Fig. 7 is a schematic structural diagram of an imaging system for medical images in an embodiment;

Fig. 8 is a schematic structural diagram of an imaging system for medical images in another embodiment;

Figure 9 is an internal block diagram of a computer device in one embodiment.

Description of reference numbers:

11: Magnetic resonance equipment; 12: Computer equipment; 13: Positioning signal acquisition device;

111: positioning sensor; 112: telescopic structure; 113: air pump;

114: head coil.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

The medical image imaging method provided in the embodiment of the present application may be applicable to the medical image imaging system shown in FIG. 1 . Wherein, the system includes a magnetic resonance device 11 and a computer device 12 ; the magnetic resonance device 11 is used to perform a magnetic resonance scan on a patient, collect the patient's MRI image data, and send the collected imaging data to the computer device 12 . It may include components such as superconducting magnets, gradient coils, radio frequency transmitting coils, radio frequency receiving coils and hospital beds. Among them, the superconducting magnet is used to form the main magnetic field; the radio frequency transmitting coil is used to execute the radio frequency sequence to emit radio frequency pulses to excite the nuclear spins in the human body; the gradient coil is used to execute the sequence to form a gradient field to stimulate the nuclear spin in the human body The magnetic resonance signal generated by the spin performs phase encoding, frequency encoding, etc.; the radio frequency receiving coil is used to receive the magnetic resonance signal. The magnetic resonance equipment 11 is also used to collect positioning data and other information data of the patient during the scanning process, and send them to the computer equipment 12 for analysis and processing. The computer device 12 is used to execute the steps in the following method embodiments, so as to realize the process of improving the quality of the obtained medical images.

In one embodiment, as shown in FIG. 2 , a medical image imaging method is provided, and the method is applied to the computer device in FIG. 1 as an example for illustration, including the following steps:

S101. Obtain positioning data sent by a positioning sensor; the positioning sensor is used to monitor the position of the inspected part in real time, and the positioning data includes the current physical coordinates of the inspected part.

Specifically, the computer device can obtain the positioning data of the inspected part sent by the positioning sensor, wherein the positioning sensor can be movably arranged on the radio frequency receiving coil and used to monitor the position of the inspected part in real time, and the obtained is the inspected part positioning data; since the positioning sensor can monitor the position of the inspected part in real time, the computer equipment can also obtain the positioning data in real time. Optionally, the computer equipment can directly acquire the positioning data from the positioning sensor, or the signal data of the positioning sensor can be collected in real time by the positioning signal acquisition device first, and transmitted to the computer equipment. Optionally, there may be multiple positioning sensors. For example, when scanning a patient's head, multiple positioning sensors may be arranged on the surface of the head to monitor the positions of multiple regions of the head.

Wherein, the above-mentioned positioning data includes the current physical coordinates of the part to be examined. In this embodiment, the physical coordinate system can be set as the plane where the scanning equipment bed (such as the magnetic resonance scanning bed) is located, then when the patient is lying on the scanning equipment bed, The physical coordinates of its various parts can be determined. Taking the above example as an example, multiple positioning sensors can monitor the positions of multiple areas of the head, and the positioning data can include the current position coordinates of multiple areas of the head, such as the position coordinates of the top of the head and the position coordinates of the temples.

The radio frequency receiving coils can include head coils, leg coils, ankle coils, abdominal coils, spine coils, etc. according to different detection parts. In one embodiment, the radio frequency receiving coil is a head coil, the inner surface of the head coil can be provided with a movable telescopic structure, the free end of the movable telescopic structure is provided with a positioning sensor, and the movement of the movable telescopic structure can make the positioning sensor close to or Keep away from the tested area. Optionally, the movable telescopic structure can be driven by electricity or inrush gas.

In one embodiment, three transmitters are arranged on the magnetic resonance scanning device or the receiving coil of the magnetic resonance scanning, and the positions of the three transmitters on the magnetic resonance scanning device or the receiving coil of the magnetic resonance scanning are fixed. The positioning sensors arranged on the surface of the body can respectively receive the signals sent by the transmitter, and the coordinate position of each positioning sensor can be determined according to the received signals. Optionally, the positioning sensor can also be integrated with a rotation receiver, and the receiver records the moving angle of each positioning sensor relative to the initial position. Further, the moving direction of the patient's head can be determined according to multiple moving angles. According to the movement angle of each positioning sensor relative to the initial position, the coordinate position of the positioning sensor can be refined to improve the positioning accuracy.

S102. Calculate the physical position offset of the inspected part.

公式计算该定位传感器对应的物理位置偏移量；若有多个定位传感器，则可以对每个定位传感器的物理位置偏移量进行平均求和，得到最终的物理位置偏移量。可选地，计算机设备还可以根据当前物理坐标和上一时刻的物理坐标，计算物理位置偏移量。In one embodiment, because the positioning sensor monitors the position of the inspected part in real time, the initial physical coordinates of the inspected part are known, and then the computer device can calculate the physical position according to the current physical coordinates and the initial physical coordinates Offset. Optionally, the computer device can calculate the physical position offset of the inspected part through the Euclidean distance formula. Exemplarily, it is assumed that the physical coordinates of the inspected part collected by a positioning sensor at the current moment (time t) are (x _t , y _t , z _t ), and the initial physical coordinates are (x ₀ , y ₀ , z ₀ ), you can pass

The formula calculates the physical position offset corresponding to the positioning sensor; if there are multiple positioning sensors, the physical position offset of each positioning sensor can be averaged and summed to obtain the final physical position offset. Optionally, the computer device may also calculate the physical position offset according to the current physical coordinates and the physical coordinates at the last moment.

In another embodiment, the positioning sensor arranged on the surface of the head can be set as an accelerometer, and the accelerometer can determine the motion acceleration of the positioning sensor arranged on the surface of the head, and the second integration of the acceleration can determine the movement of the positioning sensor. distance. Further, the physical position offset can be determined according to the moving angle of each positioning sensor relative to the initial position calculated by the aforementioned rotating receiver.

Optionally, before calculating the physical position offset, the computer device may first filter the positioning data, so as to filter out high-frequency interference.

S103. Determine the current logical coordinates of the examined part according to the current physical coordinates and the rotation matrix between the physical coordinate system and the logical coordinate system in the magnetic resonance imaging system.

Specifically, when the object to be examined is located in the scanning environment of the scanning device, the scanning device can correspond to its own logical coordinate system. For example, during magnetic resonance scanning, a series of scanning parameters can be set, and different scanning parameters determine different logical coordinate systems. , and there is a certain mapping relationship between the physical coordinate system and the logical coordinate system, that is, the rotation matrix. Then, the computer device can determine the current logical coordinates of the inspected part according to the current physical coordinates and the rotation matrix between the physical coordinate system and the logical coordinate system.

S104. Calculate a logical position offset of the inspected part according to the current logical coordinates.

In one embodiment, the computer device can calculate the logical position offset of the inspected part according to the current logical coordinates and the initial logical coordinates. In another embodiment, the computer device can also calculate the logical position offset of the inspected part according to the current logical coordinates and the logical coordinates at the previous moment. Optionally, the method for calculating the logical position offset may also use a Euclidean distance calculation formula.

Optionally, since the logical coordinate system is usually a three-dimensional coordinate system, the computer device can also calculate the offsets along the three directions of the X-axis, Y-axis and Z-axis respectively according to the current logical coordinates and the initial logical coordinates, and then calculate the The offsets in the three directions are divided by the voxel lengths in the corresponding directions to obtain the relative offsets in the three directions, and finally the final logical position offset is calculated by the Euclidean distance formula according to the relative offsets in the three directions quantity. The voxel length in this embodiment is specifically the maximum size of the patient's head along three directions in the logical coordinate system. Of course, the relative offset can also be determined by using the FOV of the patient’s current scan. Specifically, the relative offset in the three directions can be obtained by dividing the offset in the three directions by the size of the FOV in the corresponding direction. Offset.

S105. Based on the physical position offset and the logical position offset, it is judged whether the medical imaging data needs to be re-acquired, and if so, a medical image is generated according to the re-acquired medical imaging data.

Specifically, the computer device determines whether to re-acquire medical imaging data based on the obtained physical position offset and logical position offset. Optionally, two thresholds (the first threshold and the second threshold) may be preset, and if the physical position offset is greater than the first threshold, and/or the logical position offset is greater than the second threshold, it is determined that re-acquisition is required medical imaging data. That is to say, at this time, the movement range of the inspected part is too large, which may cause heavy artifacts in the generated medical image, and the influence of artifacts caused by the large motion range is compensated by re-collecting medical imaging data.

Wherein, when the medical imaging data needs to be re-acquired, the medical image is generated according to the re-acquired medical imaging data. It should be noted that, if it is determined that the motion range of the inspected part is still large during the process of re-acquisition of medical imaging data, re-acquisition is required until the medical imaging data does not need to be re-acquired. Optionally, when the medical imaging data needs to be re-acquired, the computer device can also trigger an alarm device to give an alarm prompt, so as to prompt relevant operators to perform re-acquisition.

In the imaging method of medical images provided in this embodiment, the computer device first acquires the positioning data sent by the positioning sensor. Since the positioning data includes the current physical coordinates of the inspected part, the computer device can calculate the physical position of the inspected part according to the current physical coordinates The offset, and according to the current physical coordinates and rotation matrix, determine the current logical coordinates of the inspected part; then calculate the logical position offset of the inspected part according to the current logical coordinates; finally, based on the physical position offset and logical position offset Quantitatively determine whether the medical imaging data needs to be re-acquired, and if so, generate a medical image according to the re-acquired medical imaging data. In this method, it is not necessary to use a mechanical fixation method to fix the inspected part of the subject, but to monitor the position of the inspected part through a positioning sensor, which has no restraint on the subject and will not cause the It can greatly reduce the possibility of serious artifacts; and determine whether it is necessary to re-acquire medical imaging data by judging the physical position offset and logical position offset of the inspected part. Artifacts in medical images can be further reduced by reacquiring medical imaging data during large movements.

In one embodiment, as shown in FIG. 3 , it is a schematic flow chart of a medical image imaging method in another embodiment. This embodiment relates to when the medical imaging data does not need to be re-acquired, the computer device moves the medical imaging data The specific process of compensation, optionally, the above method also includes:

S201. If the medical imaging data does not need to be re-acquired, determine a time period corresponding to the acquisition of positioning data.

Specifically, when the physical position offset is not greater than the first threshold and the logical position offset is not greater than the second threshold, it means that the current motion range of the examined part is controllable, and there is no need to re-acquire medical imaging data. Because the positioning sensor detects the position of the inspected part in real time, the computer equipment can also obtain the time point of collecting each positioning data, so the time point of the previous positioning data and the time point of the current positioning data can be used to determine the current time point of the acquisition. The time period for which the location data corresponds.

S202. Perform motion compensation on the medical imaging data collected within the above time period, and use the motion-compensated medical imaging data to generate a medical image.

Specifically, image motion compensation refers to a method to describe the difference between adjacent frames (adjacent here means adjacent in the encoding direction, and the two frames may not be adjacent in playback order), specifically to describe the previous frame How to move each small block to a certain position in the current frame. After determining the time period corresponding to the collected positioning data, the computer device can perform motion compensation on the medical imaging data collected within the time period. Initial logical coordinates, calculate the coordinate variation of the inspected part in different directions of logical coordinates, for example, the current logical coordinates are (x _j , y _j , z _j ), and the initial logical coordinates are (x ₀ ', y ₀ ', z ₀ '), then the coordinate changes in different directions are (x _j -x ₀ '), (y _j -y ₀ '), (z _j -z ₀ '), and then the computer equipment combines the coordinate changes and the The medical imaging data acquired during the time period is weighted and added/subtracted for motion compensation. After the motion compensation is completed, the medical imaging data after motion compensation is used to generate a medical image.

In the medical image imaging method provided in this embodiment, when the medical imaging data does not need to be re-acquired, the computer device determines the time period corresponding to the currently collected positioning data, and performs motion compensation on the medical imaging data collected within the time period. The compensated medical imaging data generates a medical image. In this method, when the motion range of the inspected part is small, in order to avoid image artifacts caused by it, the computer device can perform real-time motion compensation on it, so as to further reduce the influence of the motion of the inspected part on the image.

In one embodiment, the specific process for the computer device to perform motion compensation on medical imaging data may include:

First, a database of motion vectors and phase changes of magnetic resonance signals is established, and the database contains multiple pairs of motion vectors and phase offsets (biases). Exemplarily, the establishment process of the database can be performed by performing a single excitation of one layer or multiple layers on the detection site, and the detection site generates a physical position offset and a logical position offset in the scanning phase, thereby obtaining multiple sets of Phase shift of magnetic resonance signals. More specifically, in each excitation process, three reference echo signals R1, R2, and R3 without phase encoding can be collected, and the three reference echo signals are respectively the first even signal, the odd signal, and the second even signal, The phase offset between the even signal and the odd signal, and the phase offset between the first even signal and the second even signal can be obtained by comparing the phases of the first even signal, the odd signal, and the second even signal. Then, based on the physical location offset and the logical location offset, the corresponding phase offset is matched in the database.

Finally, phase correction is performed on the medical imaging data using the phase offset to obtain motion-compensated medical imaging data.

In one embodiment, the impact of the motion range of the examined part on the quality of the medical image can also be evaluated through the above physical position offset and logical position offset, as shown in Figure 4, optionally, the above method also includes:

S301. Using medical imaging data before motion compensation to generate a medical image to be quantified, and performing quantization on the medical image to be quantified under a preset image quality index to obtain a quantified result.

Specifically, before compensating the above-mentioned medical imaging data, the computer device can also use the medical imaging data before motion compensation to generate a medical image to be quantified, and set a series of image quality indicators, such as image saturation, contrast and other indicators . Then the computer equipment analyzes the medical image to be quantified, for example, based on the image pixel point value, quantifies the medical image to be quantified under the above image index, and obtains a quantified result. Optionally, the computer device may score the medical image to be quantified under different image quality indicators, and finally perform direct summation, average summation, or weighted summation of the scores under different image quality indicators to obtain a quantitative result.

S302. According to the physical position offset, the logical position offset and the quantization result, obtain the correlation between the displacement offset and the quality of the medical image in the current acquisition mode.

Wherein, the collection mode may be a mode determined according to set scanning parameters, and may include a scanning sequence type and a scanning mode. For example, the magnetic resonance scan includes a variety of scan sequences, such as T2W sequence, ADC sequence, etc., and scan methods include horizontal scan, longitudinal scan, head-to-toe scan, and foot-to-head scan. The computer device obtains the relationship between the displacement offset and the quality of the medical image in the current acquisition mode through the statistical analysis of the above physical position offset, logical position offset and quantification results.

Exemplarily, assuming that during a certain scanning process, the physical position offset and the logical position offset obtained by the computer device are both small, but the quantification result score of the medical image is low, it can be determined that in the current acquisition mode In this case, slight movement of the examined part can cause large artifacts, so in subsequent scans in this acquisition mode, the scanning technician can focus on reminding the examinee to reduce movement.

In the medical image imaging method provided in this embodiment, the computer device can also use the medical imaging data before motion compensation to generate the medical image to be quantified, and quantify the medical image to be quantified under a preset image quality index to obtain a quantified result; And according to the above-mentioned physical position offset, logical position offset and quantification results, an association relationship between the position offset and the medical image in the current acquisition mode is obtained. In this way, the influence of the motion of the examined part on the medical images obtained by different sequences and scanning methods can be evaluated, so that the scanning technician can know which acquisition modes require the examinee to minimize the movement, and focus on reminding the examinee, which can also Further reduce image artifacts caused by subject motion.

In one embodiment, the positioning airbag can also be used to assist in fixing the position of the inspected part, then the above method further includes: determining the first pressure coefficient of the positioning airbag according to the physical position offset and the logical position offset, and setting the first The pressure coefficient is sent to the air pump corresponding to the positioning airbag; wherein, the positioning airbag is used to fix the position of the inspected part.

Wherein, the positioning airbag is used to fix the position of the inspected part. The number of the positioning airbag can be multiple, which can correspond to the position of the above-mentioned positioning sensor. When the positioning airbag is inflated, the movement of the inspected part to the direction of the positioning airbag can be reduced. , the air pump is an independent multi-channel, which can independently control each positioning airbag through the pressure coefficient to adjust the pressure of the positioning airbag. The computer device can determine the first pressure coefficient of the target positioning airbag according to the above-mentioned physical position offset and logical position offset. The larger ones are used to reduce the leftward movement of the inspected part, thereby fixing the inspected part in a targeted manner. Optionally, the computer device may set a scaling factor, and multiply the initial pressure coefficient by the scaling factor according to the magnitude of the physical position offset and the logical position offset to obtain the first pressure coefficient.

Optionally, the computer device may also receive the second pressure coefficient input by the user, and send the second pressure coefficient to the inflator corresponding to the positioning airbag. When the subject is not scanning, the user can also customize the reduced pressure coefficient to improve the comfort of the subject.

In one embodiment, the process of the imaging method for medical images can refer to the schematic flow chart shown in Figure 5, then the above method includes:

S401, acquiring the current physical coordinates sent by the positioning sensor;

S402. Calculate the physical position offset of the inspected part according to the current physical coordinates and the initial physical coordinates;

S403. Determine the current logical coordinates of the inspected part according to the current physical coordinates and the rotation matrix between the physical coordinate system and the logical coordinate system in the magnetic resonance imaging system; calculate the logical coordinates of the inspected part according to the current logical coordinates and the initial logical coordinates position offset.

S404. Based on the physical position offset and the logical position offset, it is judged whether the medical imaging data needs to be collected again;

S405, if yes, generate a medical image according to the reacquired medical imaging data;

S406, if not, use the medical imaging data before motion compensation to generate the medical image to be quantified, quantify the medical image to be quantified under the preset image quality index, and obtain the quantization result, so as to obtain the difference between the displacement offset and the medical image quality at present Association relationship in collection mode;

S407, performing motion compensation on the medical imaging data collected within the time period, and generating a medical image using the motion-compensated medical imaging data;

S408. Determine the first pressure coefficient of the positioning airbag according to the physical position offset and the logical position offset, and send the first pressure coefficient to the inflator corresponding to the positioning airbag.

Regarding the implementation process and implementation principle of each step in this embodiment, reference may be made to the description in the foregoing embodiment, and details are not repeated here.

It should be understood that although the various steps in the flow charts of FIGS. 2-5 are shown sequentially as indicated by the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least some of the steps in FIGS. 2-5 may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily performed at the same time, but may be performed at different times. These sub-steps or The execution order of the stages is not necessarily performed sequentially, but may be executed alternately or alternately with at least a part of other steps or substeps of other steps or stages.

In one embodiment, as shown in FIG. 6 , an imaging device for medical images is provided, including: an acquisition module 21 , a first calculation module 22 , a second calculation module 23 and an imaging module 24 .

Specifically, the acquisition module 21 is used to acquire the positioning data sent by the positioning sensor; the positioning sensor is used to monitor the position of the inspected part in real time, and the positioning data includes the current physical coordinates of the inspected part;

The first calculation module 22 is used to calculate the physical position offset of the inspected part;

The second calculation module 23 is used to determine the current logical coordinates of the inspected part according to the current physical coordinates and the rotation matrix between the physical coordinate system and the logical coordinate system in the magnetic resonance imaging system; calculate the inspected part according to the current logical coordinates The logical position offset of ;

The imaging module 24 is configured to judge whether the medical imaging data needs to be reacquired based on the physical position offset and the logical position offset, and if so, generate a medical image according to the reacquired medical imaging data.

The imaging device for medical images provided in this embodiment can execute the above-mentioned method embodiments, and its implementation principles and technical effects are similar, and will not be repeated here.

In one embodiment, the imaging module 24 is specifically configured to, if the physical position offset is greater than a preset first threshold, and/or, the logical position offset is greater than a preset second threshold, determine that it is necessary to re-acquire medical imaging. imaging data.

In one embodiment, the above device further includes a motion compensation module, configured to determine the time period corresponding to the acquisition of the positioning data if the medical imaging data does not need to be re-acquired; perform motion compensation on the medical imaging data acquired within the time period, and A medical image is generated using motion-compensated medical imaging data.

In one embodiment, the motion compensation module is specifically used to calculate the coordinate variation of the inspected part in different directions of the logical coordinate system according to the current logical coordinates and the initial logical coordinates; Data is weighted plus/minus for motion compensation.

In one embodiment, the above-mentioned device further includes a quantitative evaluation module, which is used to generate a medical image to be quantified by using medical imaging data before motion compensation, and quantify the medical image to be quantified under a preset image quality index to obtain a quantified result; according to The physical position offset, the logical position offset, and the quantification results are used to obtain the relationship between the displacement offset and the quality of the medical image in the current acquisition mode.

In one embodiment, the above device further includes a sending module, configured to determine the first pressure coefficient of the positioning airbag according to the physical position offset and the logical position offset, and send the first pressure coefficient to the inflator corresponding to the positioning airbag ; Wherein, the positioning airbag is used to fix the position of the inspected part.

In one embodiment, the sending module is further configured to receive the second pressure coefficient input by the user, and send the second pressure coefficient to the inflator corresponding to the positioning airbag.

The imaging device for medical images provided in this embodiment can execute the above-mentioned method embodiments, and its implementation principles and technical effects are similar, and will not be repeated here.

For specific limitations on the imaging device for medical images, refer to the above-mentioned limitations on imaging methods for medical images, which will not be repeated here. Each module in the above-mentioned imaging device for medical images may be fully or partially realized by software, hardware or a combination thereof. The above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or stored in the memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

In one embodiment, as shown in FIG. 7 , a medical image imaging system is provided, which includes: a magnetic resonance device 11 and a computer device 12; the magnetic resonance device 11 includes a head coil 114, and the head coil 114 The inner surface is provided with a telescopic structure 112, and the free end of the telescopic structure 112 is connected to a positioning sensor 111, and the telescopic structure 112 drives the positioning sensor 111 to be close to or away from the inspected part; the positioning sensor 111 is used for real-time monitoring of the position of the inspected part, and will The monitored positioning data is sent to the computer device 12; the computer device 12 is used to execute the steps in the above method embodiments. As shown in FIG. 7 , the head coil 114 has an accommodation space, and the patient's head can be accommodated in the accommodation space.

Optionally, the telescopic structure 112 may include one or more positioning airbags, and the positioning airbags are driven by the air pump 113; the computer device 12 is also used to control the air pump 113 according to the received pressure coefficient to adjust the pressure of the positioning airbags.

Optionally, as shown in FIG. 8 , the above system may further include a positioning signal acquisition device 13 for collecting the positioning data of the positioning sensor 111 in real time and transmitting it to the computer device 12 . When the above-mentioned magnetic resonance equipment 11 scans the head, at least three positioning sensors 111 are distributed on the head surface, and all positioning sensors 111 are not required to be on a plane; There is a one-to-one correspondence between the quantity and the position. One end of the telescopic structure 112 is fixed inside the head coil 114 , and the other end is a free end, which is connected to the positioning sensor 111 . Optionally, the above-mentioned system further includes an alarm device (not shown in the figure), and a threshold can be set to give an alarm reminder when the motion range is too large.

In one embodiment, a computer device is provided, and the internal structure diagram of the computer device may be as shown in FIG. 9 . The computer device includes a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. Wherein, the processor of the computer device is used to provide calculation and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be realized through WIFI, an operator network, NFC (Near Field Communication) or other technologies. When the computer program is executed by the processor, a medical image imaging method is realized. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covered on the display screen, or a button, a trackball or a touch pad provided on the casing of the computer device , and can also be an external keyboard, touchpad, or mouse.

Those skilled in the art can understand that the structure shown in FIG. 9 is only a block diagram of a part of the structure related to the solution of this application, and does not constitute a limitation on the computer equipment on which the solution of this application is applied. The specific computer equipment can be More or fewer components than shown in the figures may be included, or some components may be combined, or have a different arrangement of components.

In one embodiment, a computer device is provided, including a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

Obtain the positioning data sent by the positioning sensor; the positioning sensor is used to monitor the position of the inspected part in real time, and the positioning data includes the current physical coordinates of the inspected part;

Calculate the physical position offset of the inspected part;

Determine the current logical coordinates of the inspected part according to the current physical coordinates and the rotation matrix between the physical coordinate system and the logical coordinate system in the magnetic resonance imaging system;

Calculate the logical position offset of the inspected part according to the current logical coordinates;

Based on the physical position offset and the logical position offset, it is judged whether the medical imaging data needs to be re-acquired, and if so, a medical image is generated according to the re-acquired medical imaging data.

The implementation principles and technical effects of the computer equipment provided in this embodiment are similar to those of the above method embodiments, and will not be repeated here.

In one embodiment, the following steps are also implemented when the processor executes the computer program:

If the physical position offset is greater than a preset first threshold, and/or the logical position offset is greater than a preset second threshold, it is determined that medical imaging data needs to be re-acquired.

In one embodiment, the following steps are also implemented when the processor executes the computer program:

If the medical imaging data does not need to be re-acquired, determine the time period corresponding to the acquisition of the positioning data;

Motion compensation is performed on the medical imaging data collected during the time period, and a medical image is generated by using the motion-compensated medical imaging data.

In one embodiment, the following steps are also implemented when the processor executes the computer program:

According to the current logical coordinates and the initial logical coordinates, calculate the coordinate variation of the inspected part in different directions of the logical coordinate system;

Weighted addition/subtraction is performed between the coordinate variation and the medical imaging data collected within a time period to perform motion compensation.

In one embodiment, the following steps are also implemented when the processor executes the computer program:

The medical image to be quantified is generated by using the medical imaging data before motion compensation, and the medical image to be quantified is quantified under the preset image quality index to obtain the quantified result;

According to the physical position offset, the logical position offset and the quantitative result, the relationship between the displacement offset and the quality of the medical image in the current acquisition mode is obtained.

In one embodiment, the following steps are also implemented when the processor executes the computer program:

Determine the first pressure coefficient of the positioning airbag according to the physical position offset and the logical position offset, and send the first pressure coefficient to the inflator corresponding to the positioning airbag; wherein the positioning airbag is used to fix the position of the inspected part.

In one embodiment, the following steps are also implemented when the processor executes the computer program:

The second pressure coefficient input by the user is received, and the second pressure coefficient is sent to the air pump corresponding to the positioning airbag.

In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

Obtain the positioning data sent by the positioning sensor; the positioning sensor is used to monitor the position of the inspected part in real time, and the positioning data includes the current physical coordinates of the inspected part;

Calculate the physical position offset of the inspected part;

Determine the current logical coordinates of the inspected part according to the current physical coordinates and the rotation matrix between the physical coordinate system and the logical coordinate system in the magnetic resonance imaging system;

Calculate the logical position offset of the inspected part according to the current logical coordinates;

Based on the physical position offset and the logical position offset, it is judged whether the medical imaging data needs to be re-acquired, and if so, a medical image is generated according to the re-acquired medical imaging data.

The implementation principle and technical effect of the computer-readable storage medium provided in this embodiment are similar to those of the above-mentioned method embodiments, and details are not repeated here.

In one embodiment, when the computer program is executed by the processor, the following steps are also implemented:

If the physical position offset is greater than a preset first threshold, and/or the logical position offset is greater than a preset second threshold, it is determined that medical imaging data needs to be re-acquired.

In one embodiment, when the computer program is executed by the processor, the following steps are also implemented:

If the medical imaging data does not need to be re-acquired, determine the time period corresponding to the acquisition of the positioning data;

Motion compensation is performed on the medical imaging data collected during the time period, and a medical image is generated by using the motion-compensated medical imaging data.

In one embodiment, when the computer program is executed by the processor, the following steps are also implemented:

According to the current logical coordinates and the initial logical coordinates, calculate the coordinate variation of the inspected part in different directions of the logical coordinate system;

Weighted addition/subtraction is performed between the coordinate variation and the medical imaging data collected within a time period to perform motion compensation.

In one embodiment, when the computer program is executed by the processor, the following steps are also implemented:

The medical image to be quantified is generated by using the medical imaging data before motion compensation, and the medical image to be quantified is quantified under the preset image quality index to obtain the quantified result;

According to the physical position offset, the logical position offset and the quantitative result, the relationship between the displacement offset and the quality of the medical image in the current acquisition mode is obtained.

In one embodiment, when the computer program is executed by the processor, the following steps are also implemented:

Determine the first pressure coefficient of the positioning airbag according to the physical position offset and the logical position offset, and send the first pressure coefficient to the inflator corresponding to the positioning airbag; wherein the positioning airbag is used to fix the position of the inspected part.

In one embodiment, when the computer program is executed by the processor, the following steps are also implemented:

The second pressure coefficient input by the user is received, and the second pressure coefficient is sent to the air pump corresponding to the positioning airbag.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage In the medium, when the computer program is executed, it may include the processes of the above-mentioned method embodiments. Wherein, any references to memory, storage, database or other media used in the various embodiments provided in the present application may include at least one of non-volatile memory and volatile memory. The non-volatile memory may include read-only memory (Read-Only Memory, ROM), magnetic tape, floppy disk, flash memory or optical memory, and the like. Volatile memory may include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, all It is considered to be the range described in this specification.

The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the scope of the patent for the invention. It should be noted that, for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the scope of protection of the patent application should be based on the appended claims.

Claims (9)

1. an imaging method of medical image, is characterized in that, described method comprises: Acquiring positioning data sent by a positioning sensor; the positioning sensor is used to monitor the position of the inspected part in real time, and the positioning data includes the current physical coordinates of the inspected part; calculating the physical position offset of the inspected part; Determine the current logical coordinates of the inspected part according to the current physical coordinates and the rotation matrix between the physical coordinate system and the logical coordinate system in the magnetic resonance imaging system; calculating a logical position offset of the inspected part according to the current logical coordinates; Based on the physical position offset and the logical position offset, it is judged whether it is necessary to re-acquire medical imaging data, and if so, generate a medical image according to the re-acquired medical imaging data; The method also includes: If it is not necessary to re-acquire medical imaging data, then determine the time period corresponding to the acquisition of the positioning data; Motion compensation is performed on the medical imaging data collected within the time period, and a medical image is generated using the motion-compensated medical imaging data. 2. The method according to claim 1, wherein the judging whether to re-acquire medical imaging data based on the physical position offset and the logical position offset comprises: If the physical position offset is greater than a preset first threshold, and/or the logical position offset is greater than a preset second threshold, it is determined that medical imaging data needs to be re-acquired. 3. The method according to claim 1, wherein said performing motion compensation on the medical imaging data collected within the time period comprises: According to the current logical coordinates and the initial logical coordinates, calculate the coordinate variation of the inspected part in different directions of the logical coordinate system; Weighted addition/subtraction is performed on the coordinate change amount and the medical imaging data collected within the time period to perform motion compensation. 4. method according to claim 1 or 3, is characterized in that, described method also comprises: Using medical imaging data before motion compensation to generate a medical image to be quantified, and quantifying the medical image to be quantified under a preset image quality index to obtain a quantified result; According to the physical position offset, the logical position offset and the quantization result, an association relationship between the displacement offset and the quality of the medical image in the current acquisition mode is obtained. 5. The method according to claim 1, wherein the method further comprises: Determine the first pressure coefficient of the positioning airbag according to the physical position offset and the logical position offset, and send the first pressure coefficient to the inflator corresponding to the positioning airbag; wherein, the positioning airbag Used to fix the position of the inspected part. 6. The method according to claim 5, further comprising: The second pressure coefficient input by the user is received, and the second pressure coefficient is sent to the inflator corresponding to the positioning airbag. 7. An imaging device for medical images, characterized in that the device comprises: An acquisition module, configured to acquire positioning data sent by a positioning sensor; the positioning sensor is used to monitor the position of the inspected part in real time, and the positioning data includes the current physical coordinates of the inspected part; The first calculation module is used to calculate the physical position offset of the inspected part; The second calculation module is used to determine the current logical coordinates of the inspected part according to the current physical coordinates and the rotation matrix between the physical coordinate system and the logical coordinate system in the magnetic resonance imaging system; according to the current logical coordinates , calculating the logical position offset of the inspected part; An imaging module, configured to judge whether medical imaging data needs to be re-acquired based on the physical position offset and the logical position offset, and if so, generate a medical image according to the re-acquired medical imaging data; The device also includes a motion compensation module, which is used to determine the time period corresponding to the acquisition of the positioning data if the medical imaging data does not need to be re-acquired; perform motion compensation on the medical imaging data acquired within the time period, and use motion The compensated medical imaging data generates a medical image. 8. An imaging system for medical images, characterized in that the system includes: magnetic resonance equipment and computer equipment; the magnetic resonance equipment includes a head coil, the inner surface of the head coil is provided with a telescopic structure, and the The free end of the telescopic structure is connected to a positioning sensor, and the telescopic structure drives the positioning sensor to be close to or away from the inspected part; The positioning sensor is used for real-time monitoring of the position of the inspected part, and the monitored positioning data is sent to the computer device; the computer device is used for: Acquiring positioning data sent by the positioning sensor, the positioning data including the current physical coordinates of the inspected part; calculating the physical position offset of the inspected part; Determine the current logical coordinates of the inspected part according to the current physical coordinates and the rotation matrix between the physical coordinate system and the logical coordinate system in the magnetic resonance imaging system; calculating a logical position offset of the inspected part according to the current logical coordinates; Based on the physical position offset and the logical position offset, it is judged whether it is necessary to re-acquire medical imaging data, and if so, generate a medical image according to the re-acquired medical imaging data; Said computer equipment is also used for: If it is not necessary to re-acquire medical imaging data, then determine the time period corresponding to the acquisition of the positioning data; Motion compensation is performed on the medical imaging data collected within the time period, and a medical image is generated using the motion-compensated medical imaging data. 9. The medical image imaging system according to claim 8, wherein the telescoping structure includes one or more positioning airbags, and the positioning airbags are driven by an air pump; The computer device is also used for controlling the air pump to adjust the pressure of the positioning airbag according to the received pressure coefficient.

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