CN119113421A - Calibration device and detection method, detection component debugging method, radiotherapy equipment - Google Patents
Calibration device and detection method, detection component debugging method, radiotherapy equipment Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001959 radiotherapy Methods 0.000 title claims abstract description 19
- 238000003384 imaging method Methods 0.000 claims abstract description 59
- 238000009434 installation Methods 0.000 claims abstract description 26
- 238000011897 real-time detection Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 2
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- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002786 image-guided radiation therapy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1048—Monitoring, verifying, controlling systems and methods
- A61N5/1075—Monitoring, verifying, controlling systems and methods for testing, calibrating, or quality assurance of the radiation treatment apparatus
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1048—Monitoring, verifying, controlling systems and methods
- A61N5/1049—Monitoring, verifying, controlling systems and methods for verifying the position of the patient with respect to the radiation beam
- A61N2005/1061—Monitoring, verifying, controlling systems and methods for verifying the position of the patient with respect to the radiation beam using an x-ray imaging system having a separate imaging source
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1048—Monitoring, verifying, controlling systems and methods
- A61N5/1075—Monitoring, verifying, controlling systems and methods for testing, calibrating, or quality assurance of the radiation treatment apparatus
- A61N2005/1076—Monitoring, verifying, controlling systems and methods for testing, calibrating, or quality assurance of the radiation treatment apparatus using a dummy object placed in the radiation field, e.g. phantom
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Abstract
本发明公开了一种校准装置及检测方法、检测组件调试方法、放射治疗设备，其中，校准装置包括主体部和校准部；主体部用于安装在旋转装置上，且所述主体部能够绕所述成像系统的理论等中心点转动；校准部安装于所述主体部并能够跟随所述主体部转动，且所述校准部安装于所述主体部的中心位置；所述校准部用于在转动过程中实时指示所述校准装置的机械等中心点，以判断所述机械等中心点与所述理论等中心点之间的偏差，实现了更加便捷精准地判断校准装置安装位置是否发生偏差，从而保障放射治疗设备的安装精度以及放射治疗效果。
The present invention discloses a calibration device and a detection method, a detection component debugging method, and radiotherapy equipment, wherein the calibration device comprises a main body and a calibration part; the main body is used to be installed on a rotating device, and the main body can rotate around the theoretical isocenter of the imaging system; the calibration part is installed on the main body and can rotate with the main body, and the calibration part is installed at the center position of the main body; the calibration part is used to indicate the mechanical isocenter of the calibration device in real time during the rotation process, so as to judge the deviation between the mechanical isocenter and the theoretical isocenter, so as to realize more convenient and accurate judgment on whether the installation position of the calibration device deviates, thereby ensuring the installation accuracy of the radiotherapy equipment and the radiotherapy effect.
Description
Technical Field
The invention relates to the technical field of radiotherapy, in particular to a calibration device, a detection method, a detection assembly debugging method and radiotherapy equipment.
Background
Radiation therapy is an existing treatment technique that includes 2D IGRT (2D Image-Guided Radiation Therapy ). The 2D IGRT directs radiation therapy by using two-dimensional images. In 2D IGRT, a physician uses an imaging system to acquire two-dimensional images of the corresponding region of the patient, and then uses these images to determine the patient's position and location of the tumor. Such information may be used to guide the positioning and orientation of the radiation source to ensure that the radiation therapy irradiates the tumor area accurately and to minimize damage to surrounding healthy tissue.
A pair of X-ray imaging modules may be employed in the imaging system, with a pair of X-rays generated by the pair of X-ray imaging modules intersecting at an isocenter. The X-ray imaging module comprises an X-ray generating device and an image processing device, wherein the X-ray generating device passes through the isocenter and is projected to the image processing device, so that corresponding two-dimensional image information is formed on the image processing device. If deviation occurs during the installation of the X-ray imaging module, the two-dimensional image information formed on the image processing device also generates deviation, so that the judgment accuracy of the tumor position of the patient is affected.
In the existing imaging system, a calibration device is installed on the imaging system, so that the center point of the calibration device coincides with the isocenter of the imaging system, and then the installation of the X-ray imaging module is indicated by the center point of the calibration device. The existing calibration device cannot judge whether the center point of the calibration device deviates from the center point of the imaging system after being installed, and whether the installation position of the calibration device is accurate or not cannot be judged.
Disclosure of Invention
The invention aims to provide a calibration device, a detection method, a detection assembly debugging method and radiation therapy equipment, which are used for judging whether the installation position of the calibration device deviates more accurately.
The invention adopts the following technical scheme:
A calibration apparatus for an imaging system, comprising:
A main body part for mounting on a rotating device, the main body part being rotatable about a theoretical isocenter of the imaging system;
The calibration part is used for indicating a mechanical isocenter of the calibration device in real time in the rotation process so as to judge the deviation between the mechanical isocenter and the theoretical isocenter, and comprises a plurality of calibration surfaces, wherein the central positions of the plurality of calibration surfaces are projected on the mechanical isocenter together;
the light ray generation device can generate two intersected light rays emitted towards the outside;
At least one pair of locating surfaces and at least one light-transmitting channel for extending between a pair of the locating surfaces, with an axis of the light-transmitting channel passing through the mechanical isocenter and perpendicular to the corresponding locating surface;
the light generating device is arranged on the positioning surface, and the light generated by the light generating device is perpendicular to the positioning surface.
Preferably, the calibration surface is provided with an identification area, a center point of the identification area coincides with a center position of the calibration surface, and the identification area is used for indicating an allowable deviation range of the theoretical isocenter and the mechanical isocenter;
and/or, adjacent alignment surfaces are perpendicular to each other.
Preferably, the light generating device is provided with at least one pair, the pair of light generating devices are distributed on two opposite sides of the center point of the main body part, and the connecting line of the axes of the light generated by the pair of light generating devices passes through the mechanical isocenter.
Preferably, the calibration surface is located in the light-transmitting channel and is arranged opposite to a reflective surface arranged on the side of the radiation generating device facing the calibration device and/or on the side of the image processing device facing the calibration device.
Preferably, the light generating device is detachably arranged on one side of the positioning surface facing the outside;
And/or, the light generating devices are provided with two pairs, each pair of light generating devices is diagonally arranged on the main body part, the two pairs of light generating devices generate light rays which are crosswise arranged, and the two pairs of light rays generated by the light generating devices intersect at the mechanical isocenter.
A detection method of a calibration device, the detection method being applied to any one of the calibration devices described above, the detection method comprising:
Mounting the calibration device to the rotation device;
rotating a calibration device and enabling a calibration part of the calibration device to rotate around a theoretical isocenter of the imaging system;
the method for detecting the deviation between the mechanical isocenter and the theoretical isocenter indicated by the calibration part comprises the steps of detecting the deviation between the mechanical isocenter and the theoretical isocenter indicated by the calibration part in real time, judging whether the deviation between the mechanical isocenter and the theoretical isocenter exceeds an allowable value, adjusting the calibration device if the deviation between the mechanical isocenter and the theoretical isocenter exceeds the allowable value, judging that the installation position of the calibration device is accurate if the deviation between the mechanical isocenter and the theoretical isocenter is within the allowable value, and specifically comprising the following steps:
and detecting the deviation between the theoretical isocenter projected on the calibration surface and the central position of the calibration surface by adopting an external detection device so as to judge the deviation between the mechanical isocenter and the theoretical isocenter.
Preferably, the calibration surface is provided with an identification area, a center point of the identification area coincides with a center position of the calibration surface, and the identification area is used for indicating an allowable deviation range of the theoretical isocenter and the mechanical isocenter;
the step of judging whether the deviation between the mechanical isocenter and the theoretical isocenter exceeds an allowable value specifically comprises judging whether the position of the theoretical isocenter projected on the calibration surface is located in the identification area, judging that the deviation between the mechanical isocenter and the theoretical isocenter in a direction parallel to the calibration surface is within the allowable value if the position of the theoretical isocenter projected on the calibration surface is located in the identification area, and judging that the deviation between the mechanical isocenter and the theoretical isocenter in a direction parallel to the calibration surface exceeds the allowable value if the position of the theoretical isocenter projected on the calibration surface exceeds the identification area.
Preferably, the external detection device is a theodolite or a laser tracker;
and/or, the "detecting in real time the deviation between the mechanical isocenter indicated by the calibration section and the theoretical isocenter, and determining whether the deviation between the mechanical isocenter and the theoretical isocenter exceeds an allowable value" specifically includes:
and detecting deviation between a mechanical isocenter and the theoretical isocenter when the calibration part rotates to a plurality of different angles, and judging whether the deviation between the mechanical isocenter and the theoretical isocenter exceeds an allowable value or not under the plurality of different angles.
An imaging system, comprising:
A calibration device for any one of the imaging systems described above;
the detection component is positioned on the extending path of the light generated by the light generating device in the calibrating device;
the light generated by the light generating device is used for indicating the installation position of the detection component, the detection component comprises a ray generating device and an image processing device, the ray generating device and the image processing device are distributed on two opposite sides of the center point of the main body, one side of the ray generating device faces the calibration device, and/or one side of the image processing device faces the calibration device is provided with a reflecting surface, and the reflecting surface is used for reflecting the light generated by the light generating device.
A debugging method of a detection component is applied to any one of the imaging systems, and comprises the following steps:
installing a calibration device, and enabling the deviation between a mechanical isocenter and a theoretical isocenter of the calibration device to meet the requirement;
The light generating device generates light and drives the detection component to be positioned on an extension path of the light generated by the light generating device.
Preferably, the detection assembly comprises a radiation generating device and an image processing device;
The debugging method further comprises the following steps:
And a reflecting surface is arranged on one side of the ray generating device facing the calibration device and/or one side of the image processing device facing the calibration device, the reflecting surface is positioned on the extending path of the light to reflect the light, and the ray generating device and/or the image processing device are rotated to enable the emitting path of the light to coincide with the reflecting path.
Preferably, the debugging method further comprises:
The ray generating device generates rays passing through the light transmission channel and the positioning surfaces positioned on two opposite sides of the light transmission channel, the image processing device receives the rays generated by the ray generating device and generates corresponding image information, and the positions of the ray generating device and/or the image processing device are adjusted so that the image parts corresponding to the center marks of a pair of positioning surfaces in the image information generated by the image processing device are overlapped, and the image information corresponding to the center marks is positioned in the middle of the whole image information.
The radiation therapy equipment comprises a detection component, wherein the detection component is debugged by adopting the debugging method of any one of the detection components.
Compared with the prior art, the invention has the beneficial effects that at least:
Through setting up the machinery isocenter that calibration portion instructs calibrating device, when main part rotates, the calibration portion rotates and can implement the machinery isocenter that instructs calibrating device along with main part, through judging the deviation between the machinery isocenter of calibrating device and the theoretical isocenter of imaging system, can judge whether calibrating device's mounted position produces the deviation, and then can be convenient for adjust calibrating device's position to ensure the position accuracy of the machinery isocenter that calibrating device instructs, the detection component realizes accurately detecting patient's position, guarantee radiotherapy equipment's treatment.
Drawings
FIG. 1 is a schematic diagram of a calibration device according to an embodiment of the present invention;
FIG. 2 is a schematic view of a part of the structure of a calibration device according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a calibration device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an imaging system according to an embodiment of the present invention.
100 Parts of calibration device, 1 part of main body, 11 parts of positioning surface, 12 parts of light transmission channel, 13 parts of concave cavity, 14 parts of extension rod, 2 parts of calibration part, 21 parts of calibration surface, 22 parts of identification area, 3 parts of light generating device, 200 parts of detection component, 201 parts of light generating device, 202 parts of image processing device, 203 parts of reflection surface.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted.
The words expressing the positions and directions described in the present invention are described by taking the drawings as an example, but can be changed according to the needs, and all the changes are included in the protection scope of the present invention.
As shown in fig. 1, the present invention provides a calibration apparatus 100 for an imaging system for calibrating the mounting positions of components in the imaging system, such as the mounting positions of a detection assembly 200 in the imaging system, such that the individual components in the detection assembly 200 are aligned with a theoretical isocenter of the imaging system. The theoretical isocenter of the imaging system is a preset isocenter, and after the theoretical isocenter is determined, the imaging system, the treatment head and other components in the radiotherapy equipment are all installed based on the theoretical isocenter.
A mechanical isocenter for coinciding or substantially coinciding with a theoretical isocenter of the imaging system may be formed within the calibration device 100. In practical application, the mechanical isocenter of the calibration device 100 and the theoretical isocenter cannot be completely overlapped basically, and a deviation value between the mechanical isocenter and the theoretical isocenter is not more than an allowable value, which indicates that the installation position of the calibration device 100 is accurate, and the mechanical isocenter of the calibration device 100 can be used as a substitute point of the theoretical isocenter. The allowable value of the deviation between the mechanical isocenter and the theoretical isocenter may be 1mm.
The calibration device 100 may be mounted on a rotating device and may be capable of rotating about a theoretical isocenter of the imaging system upon actuation of the rotating device. The position of the mechanical isocenter of the calibration device 100 may change during rotation of the calibration device 100, and when the deviation value between the mechanical isocenter of the calibration device 100 and the theoretical isocenter during rotation does not exceed the allowable value, the installation position of the calibration device 100 is accurate, and the mechanical isocenter of the calibration device 100 can be used as a substitute point of the theoretical isocenter to indicate the installation of the detection assembly 200. Wherein the rotating device is a treatment head for providing a beam of energetic particles for treatment of the patient.
The calibration device 100 includes a main body 1 and a calibration unit 2 attached to the main body 1. The body part 1 and the calibration part 2 remain relatively fixed. The main body 1 is mounted on a rotating device, for example, a treatment head, which moves the main body 1 and the calibration part 2 mounted on the main body 1 synchronously. The body part 1 may be recessed and form a recessed cavity 13, and the mechanical isocenter of the calibration device 100 may be located in this recessed cavity 13, e.g. the mechanical isocenter of the calibration device 100 coincides with the center point of the body part 1, the center point of the body part 1 coincides with the center point of the recessed cavity 13.
The calibration part 2 is accommodated in the concave cavity 13 of the main body part 1, and the calibration part 2 may be mounted at a central position of the main body part 1, for example, a central point of the calibration part 2 may coincide with a central point of the main body part 1, i.e., a central point of the calibration part 2 may coincide with a mechanical isocenter, so that the calibration part 2 may indicate a position of the mechanical isocenter. When the calibration device 100 rotates, the calibration part 2 and the main body part 1 move synchronously, and the center point of the calibration part 2 can be kept coincident with the mechanical center point, so that the calibration part 2 can indicate the position of the mechanical center point in real time during rotation, and further, the deviation between the position of the mechanical center point indicated by the calibration part 2 and the theoretical center point can be detected in real time. Wherein the calibration part 2 may be connected to the main body part 1 by an extension rod 14, and the calibration part 2 may coincide with the center point of the main body part 1.
Referring to fig. 2, in some embodiments, the calibration part 2 includes a plurality of calibration surfaces 21, and the center positions of the plurality of calibration surfaces 21 are projected together at a mechanical isocenter, so that the calibration part 2 can indicate the position of the mechanical isocenter through an intersection of the projections of the center positions of the plurality of calibration surfaces 21. Wherein adjacent alignment surfaces 21 may be perpendicular to each other. For example, the alignment part 2 may have a square structure, and the surface of the square structure forms the alignment surface 21 of the alignment part 2.
In order to facilitate the determination of whether the deviation of the mechanical isocenter from the theoretical isocenter exceeds the allowable value, the calibration surface 21 is provided with an identification area 22, the center point of the identification area 22 coincides with the center position of the calibration surface 21, and the identification area 22 can be used for indicating the allowable deviation range of the theoretical isocenter from the mechanical isocenter. Specifically, the identification area 22 may be a circular area, the radius of the identification area 22 is an allowable value of a theoretical isocenter and a mechanical isocenter, and the center position of the identification area 22 is projected on the mechanical isocenter. If the projection point of the theoretical isocenter on the calibration surface 21 is located in the identification area 22, it indicates that the deviation value of the theoretical isocenter from the mechanical isocenter in the direction parallel to the calibration surface 21 is within the allowable value, and if the projection point of the theoretical isocenter on the calibration surface 21 is located outside the identification area 22, it indicates that the deviation value of the theoretical isocenter from the mechanical isocenter in the direction parallel to the calibration surface 21 is greater than the allowable value. Wherein each calibration surface 21 may be provided with an identification area 22, respectively.
When it is determined that the deviation value between the mechanical isocenter of the calibration device 100 and the theoretical isocenter does not exceed the allowable value when the calibration device 100 is rotated to different positions, the mechanical isocenter of the calibration device 100 can be used to indicate the installation of the detection assembly 200. When the deviation value between the mechanical isocenter of the calibration device 100 and the theoretical isocenter does not exceed the allowable value, the detection assembly 200 is adjusted so that the detection assembly 200 is opposite to the mechanical isocenter of the calibration device 100, and the detection assembly 200 can complete the installation of the detection assembly 200, so that the detection assembly 200 can accurately detect the position of the patient and ensure the treatment effect of the radiotherapy equipment.
Referring to fig. 1 and 3, to facilitate adjustment of the detection assembly 200, the body portion 1 may be connected with a light generating device 3, and the light generating device 3 may emit intersecting light toward the outside, and the light may extend in a forward direction or a reverse direction of the light emitting direction to coincide with a center point (mechanical isocenter) of the body portion 1, so that the light may indicate a mechanical isocenter position of the calibration device 100. Specifically, when the light generating device 3 is emitted toward the center point of the main body 1, the light generated by the light generating device 3 extends to the center point of the main body 1 in the positive direction of the emission direction of the light, and further extends toward the outside. When the light generating device 3 emits in a direction away from the center point of the main body 1, the light generated by the light generating device 3 can extend to the center point of the main body 1 in a direction opposite to the emitting direction of the light. When the detecting component 200 faces the light generated by the light generating device 3, the detecting component 200 can face the mechanical isocenter position of the calibrating device 100. Wherein, the light generating device 3 is detachably mounted on the main body 1, so that the light generating device 3 can be separated from the main body 1 after the indication detecting assembly 200 is mounted.
In some embodiments, the components in the detection assembly 200 may be distributed on opposite sides of the main body 1, the light generating devices 3 may be provided with at least one pair, the pair of light generating devices 3 may be distributed on opposite sides of the main body 1, and the axis lines of the light generated by the pair of light generating devices 3 pass through the center point of the main body 1, that is, the mechanical isocenter. The light generating device 3 located at one side of the main body 1 is used to indicate the mounting position of the components located at the same side of the main body 1 in the detection assembly 200. The detection assembly 200 may include a radiation generating device 201 and an image processing device 202, where the radiation generating device 201 and the image processing device 202 are distributed on opposite sides of the main body 1. One of the pair of light generating devices 3 is used to indicate the mounting position of the light generating device 201, and the other is used to indicate the mounting position of the image processing device 202.
As a preferred embodiment, the detecting unit 200 includes two pairs of light generating devices 3, each pair of light generating devices 3 is diagonally disposed on the main body 1, and the light generated by the two pairs of light generating devices 3 is disposed to intersect, and the intersection point of the light generated by the two pairs of light generating devices 3 coincides with the center point of the main body 1. Two pairs of light generating devices 3 may correspond to two detection assemblies 200 such that each pair of light generating devices 3 may be used to indicate the installation of one detection assembly 200.
In some embodiments, the main body 1 is provided with a positioning surface 11 for matching with the light generating device 3, the light generating device 3 is detachably mounted on the positioning surface 11 of the main body 1, specifically, the main body 1 may have a substantially square structure, at least one corner of the main body 1 is a unfilled corner and forms the positioning surface 11 facing the center point of the main body 1, that is, a connection line between the center point of the main body 1 and the center point of the positioning surface 11 is perpendicular to the positioning surface 11, a first connection line between the center points of the pair of positioning surfaces 11 in a first diagonal direction passes through a mechanical isocenter, a second connection line between the center points of the pair of positioning surfaces 11 in a second diagonal direction passes through the mechanical isocenter, and the first connection line and the second connection line intersect at the mechanical isocenter.
In this embodiment, at least one pair of oppositely disposed corners of the main body 1 are formed into unfilled corners and form one positioning surface 11, and preferably, four corners of the main body 1 are all unfilled corners and form one positioning surface 11. The light generating device 3 is detachably installed on one side of the positioning surface 11 facing the outside, and the light generated by the light generating device 3 is emitted back to the direction of the central point of the main body part 1. The light generating device 3 may be detachably mounted on the positioning surface 11 of the main body 1 by magnetic attraction, clamping, screwing, bonding, or the like. The light generating device 3 may be a laser emitter, and the light generated by the light generating device 3 may be a laser beam with a cross section. The light generating device 3 may be perpendicular to the corresponding positioning surface 11 such that the light generated by the light generating device 3 is perpendicular to the corresponding positioning surface 11, thereby more efficiently judging the relationship between the positioning surface 11 and the reflecting surface 203.
The light generating means 3 is directly or indirectly mounted to the main body 1, and in some embodiments the positioning surface 11 may also be the outer side surface of a positioning member mounted to the four corners of the main body 1.
Referring to fig. 3, in order to allow the radiation generated by the radiation generating device 201 in the detection assembly 200 to be directed toward the center of the image processing device 202, the positioning surface 11 of the main body 1 is provided with at least one pair, and the main body 1 is provided with at least one light-transmitting channel 12. The light-transmitting channel 12 penetrates the main body portion 1 and passes through the center point of the main body portion 1, and the light-transmitting channel 12 extends from one positioning surface 11 to the other positioning surface 11 of the pair of positioning surfaces 11. Each positioning surface 11 may be provided with a center mark, the center marks of a pair of positioning surfaces 11 are located on the extending path of the light transmission channel 12, and the connecting line of the center points of the center marks passes through the center point of the main body 1. A pair of center marks may form a projection image under radiation generated by the radiation generating device 201, which may be used to indicate the mounting positions of the radiation generating device 201 and the corresponding image processing device 202 in the imaging system, so that radiation generated by the radiation generating device 201 in the detection assembly 200 may be directed towards the center position of the image processing device 202. The center mark of the positioning surface 11 may be a cross mark line, and the center point of the center mark is a cross intersection point of the cross mark line.
As a preferred embodiment, the positioning surfaces 11 of the main body 1 are provided with two pairs, and the light transmission channels 12 are provided with two pairs, each light transmission channel 12 corresponds to one pair of positioning surfaces 11, and each pair of positioning surfaces 11 is used for indicating the installation positions of the radiation generating device 201 and the image processing device 202 in the same detection assembly 200 in the imaging system.
The invention also provides a detection method of the calibration device, which can be applied to the calibration device 100 to detect whether the installation position of the calibration device 100 is accurate. The detection method of the calibration device 100 includes steps S01 to S03.
Step S01, installing the calibration device 100 on a rotating device;
step S02, rotating the calibration device 100, and enabling the calibration part 2 of the calibration device 100 to rotate around a theoretical isocenter of an imaging system;
In step S03, the deviation between the mechanical isocenter and the theoretical isocenter indicated by the calibration unit 2 is detected in real time, whether the deviation between the mechanical isocenter and the theoretical isocenter exceeds an allowable value is determined, the calibration device 100 is adjusted if the deviation between the mechanical isocenter and the theoretical isocenter exceeds the allowable value, and the installation position of the calibration device 100 is determined to be accurate if the deviation between the mechanical isocenter and the theoretical isocenter is within the allowable value.
Step S01 specifically includes mounting the calibration device 100 on the treatment head, so that the calibration device 100 can rotate under the drive of the treatment head. When the calibration device 100 is mounted on the treatment head, the center point of the calibration part 2 of the calibration device 100 substantially coincides with the theoretical isocenter of the imaging system, i.e. the center point of the calibration part 2 coincides with the theoretical isocenter of the imaging system or there is a small offset. The calibration unit 2 of the calibration device 100 indicates the position of the mechanical isocenter in real time by the intersection of the projections of the center points of the plurality of calibration surfaces 21.
In step S02, the calibration device 100 is rotated by the drive of the treatment head, and the treatment head is rotated around the theoretical isocenter of the imaging system, so that the calibration part 2 of the calibration device 100 can be rotated around the theoretical isocenter of the imaging system.
In step S03, an external detection device is used to detect a deviation between the theoretical isocenter of the imaging system projected on the calibration surface 21 and the center position of the calibration surface 21. If the theoretical isocenter coincides with the mechanical isocenter in a direction parallel to the calibration surface 21, the theoretical isocenter coincides with the center position of the calibration surface 21 after being projected on the calibration surface 21, and if the theoretical isocenter is displaced from the mechanical isocenter in a direction parallel to the calibration surface 21, the theoretical isocenter is shifted from the center position of the calibration surface 21 after being projected on the calibration surface 21. The offset of the theoretical isocenter from the mechanical isocenter in the direction parallel to the calibration surface 21 can be determined by the deviation of the theoretical isocenter from the center position of the calibration surface 21 after being projected on the calibration surface 21. The alignment surface 21 may be, for example, one of X-Y planes, and the X-axis and Y-axis are parallel to the alignment surface 21. Furthermore, the plurality of calibration surfaces 21 includes not only surfaces in the X-Y plane but also surfaces in the X-Z and Y-Z planes. The external detection device may be a theodolite or a laser tracker. For example, when the external detecting device is employed as a theodolite, a plurality of theodolites may be provided, one for each calibration surface 21, the theodolite facing the theoretical isocenter, and the projection position of the theoretical isocenter on the corresponding calibration surface 21 is observed through the theodolite.
When the calibration part 2 is located at one position, when the deviation values of the projections of the theoretical isocenter on the plurality of calibration surfaces 21 and the center positions of the corresponding calibration surfaces 21 are smaller than or equal to the allowable values, the installation position of the calibration device 100 is indicated to be accurate, so that the detection assembly 200 can be accurately adjusted later. When the deviation value between the projection of the theoretical isocenter on any one of the calibration surfaces 21 and the position at the center of the corresponding calibration surface 21 is greater than the allowable value, it indicates that the installation position of the calibration device 100 cannot meet the requirement, and at this time, the calibration device 100 needs to be adjusted, and the adjustment of the calibration device 100 is not limited to the adjustment of the calibration device 100, but can be the adjustment of the frame for installing the treatment head, so as to realize the adjustment of the calibration device 100 installed on the treatment head.
In the rotation process of the calibration unit 2, it is possible to detect whether the deviation value of the projection of the mechanical isocenter indicated by the calibration unit 2 and the theoretical isocenter on each calibration surface 21 is equal to or smaller than the allowable value when the calibration unit 2 rotates to different angles, and if the deviation value of the projection of the mechanical isocenter and the theoretical isocenter on any one calibration surface 21 of the calibration unit 2 at any one angle is greater than the allowable value, it indicates that the installation position of the calibration device 100 cannot meet the requirement, otherwise, it indicates that the installation position meets the requirement.
In some embodiments, when the calibration surface 21 is provided with the identification area 22, by determining whether the projection of the theoretical isocenter on the corresponding calibration surface 21 is located in the identification area 22, it can be efficiently determined whether the deviation value between the projection of the theoretical isocenter on the calibration surface 21 and the position located in the center of the corresponding calibration surface 21 is greater than the allowable value. Specifically, if the position of the theoretical isocenter projected on the calibration surface 21 is located in the identification area 22, it is determined that the deviation between the mechanical isocenter and the theoretical isocenter is within the allowable value, and if the position of the theoretical isocenter projected on the calibration surface 21 is beyond the identification area 22, it is determined that the deviation between the mechanical isocenter and the theoretical isocenter is beyond the allowable value.
Referring to fig. 4, the present invention further provides an imaging system including the detection assembly 200 and the calibration apparatus 100 described above.
The detection assembly 200 comprises a radiation generating device 201 and an image processing device 202, the radiation generating device 201 and the image processing device 202 being arranged on opposite sides of an isocenter of the imaging system, and the radiation generating device 201 being arranged to generate radiation which can pass through the calibration device 100 and be projected into the image processing device 202. The detecting elements 200 may be disposed in a pair, the detecting elements 200 are disposed diagonally, and the rays generated by the pair of ray generating devices 201 in the detecting elements 200 intersect, and when the portions of the detecting elements 200 are aligned with the isocenter of the imaging system, the rays generated by the pair of ray generating devices 201 in the detecting elements 200 intersect at the isocenter of the imaging system. The radiation generating device 201 may be an X-ray tube for generating X-rays. The image processing device 202 may be a flat panel detector, which is configured to receive radiation and convert optical signals into electrical signals containing image information, and the electrical signals may be transmitted to a display end to form image information that can be presented to a user.
The ray generating device 201 and/or the image processing device 202 in the detecting assembly 200 may be located on the extending path of the light generated by the light generating device 3 in the calibrating device 100, where two ray generating devices 201 and image processing devices 202 are respectively provided, and the ray generating devices and the corresponding image processing devices are matched. Specifically, the radiation generating device 201 and the image processing device 202 in the detection assembly 200 are respectively located on opposite sides of the calibration device 100. The light generating device 3 in the calibration device 100 is provided with a pair, one of the pair of light generating devices 3 emits light toward the radiation generating device 201 and is used for indicating the installation position of the radiation generating device 201, and the other of the pair of light generating devices 3 emits light toward the image processing device 202 and is used for indicating the installation position of the image processing device 202. In this embodiment, the detecting assembly 200 may be provided with two, and the light generating devices 3 in the calibration device 100 may be provided with two pairs, each pair of light generating devices 3 being used to indicate the installation positions of the light generating device 201 and the image processing device 202 in one detecting assembly 200.
In some embodiments, the side of the radiation generating device 201 facing the calibration device 100 and/or the side of the image processing device 202 facing the calibration device 100 is provided with a reflecting surface 203, and the reflecting surface 203 is configured to reflect the light generated by the light generating device 3. Wherein the reflective surface 203 may be used to indicate the mounting position of the radiation generating device 201 and/or the image processing device 202. The reflecting surface 203 may be a surface of a reflecting mirror, and the reflecting mirror may be detachably mounted on the radiation generating device 201 and/or the image processing device 202 by means of adhesion, clamping, or the like.
When the reflecting surface 203 is arranged on the side of the radiation generating means 201 facing the collimator means 100, the reflecting surface 203 may be perpendicular to the radiation generated by the radiation generating means 201, for example a mirror forming the reflecting surface 203 is mounted to the radiation generating means 201 for emitting radiation. If the ray generating device 201 faces the center point of the main body 1, that is, the isocenter of the imaging system, the center of the reflecting surface 203 connected with the ray generating device 201 faces the center point of the main body 1, at this time, the ray generated by the ray generating device 3 corresponding to the ray generating device 201 is perpendicular to the reflecting surface 203, that is, the reflecting surface 203 is parallel to the positioning surface 11 on which the corresponding ray generating device 3 is mounted, and the ray path reflected by the reflecting surface 203 coincides with the outgoing path of the ray from the ray generating device 3.
If the ray generating device 201 deflects relative to the center point of the main body 1, at this time, the ray generated by the ray generating device 3 is not perpendicular to the reflecting surface 203, and the ray path of the ray reflected by the reflecting surface 203 is offset relative to the outgoing path of the ray from the ray generating device 3, at this time, the ray generating device 201 is rotated, so that the ray path of the ray reflected by the reflecting surface 203 corresponding to the ray generating device 201 coincides with the outgoing path of the ray from the ray generating device 3, and further the deflection angle of the ray generating device 201 is compensated, so as to correct the rotation error of the ray generating device 201, and ensure that the ray generating device 201 is installed at an accurate position.
When the reflection surface 203 is provided on the side of the image processing apparatus 202 facing the calibration apparatus 100, the reflection surface 203 may be parallel to a surface for receiving image information in the image processing apparatus 202. For example, a mirror forming the reflecting surface 203 is mounted on the surface for receiving image information in the image processing apparatus 202. If the image processing device 202 faces the center point of the main body 1, that is, the isocenter of the imaging system, the center of the reflecting surface 203 connected to the image processing device 202 faces the center point of the main body 1, the light generated by the light generating device 3 corresponding to the image processing device 202 is perpendicular to the reflecting surface 203, that is, the reflecting surface 203 is parallel to the positioning surface 11 on which the corresponding light generating device 3 is mounted, the light path reflected by the reflecting surface 203 coincides with the outgoing path of the light from the light generating device 3, and the reflecting surface 203 provided on the image processing device 202 is parallel to the reflecting surface 203 of the radiation generating device 201 opposite to the image processing device 202.
If the image processing device 202 deflects relative to the center point of the main body 1, the light generated by the light generating device 3 corresponding to the image processing device 202 is not perpendicular to the reflecting surface 203, and the light path reflected by the reflecting surface 203 is offset relative to the outgoing path of the light from the light generating device 3, at this time, the image processing device 202 is adjusted so that the light path reflected by the reflecting surface 203 corresponding to the image processing device 202 coincides with the outgoing path of the light from the light generating device 3, and the deflection angle of the image processing device 202 is further compensated, so that the correction of the rotation error of the image processing device 202 is realized, and the image processing device 202 is ensured to be mounted at an accurate position.
In some embodiments, the radiation generating device 201 and the image processing device 202 in the detecting assembly 200 are disposed on opposite sides of the light-transmitting channel 12, and the radiation generated by the radiation generating device 201 can pass through the light-transmitting channel 12 and a pair of positioning surfaces 11 corresponding to the light-transmitting channel 12 and be received by the image processing device 202, so that the image processing device 202 forms corresponding image information. The image information formed by the image processing apparatus 202 includes image information corresponding to the center marks of the pair of positioning surfaces 11. If the ray generating device 201 and the image processing device 202 are both facing the isocenter of the main body 1, the image information corresponding to the center mark of the pair of positioning surfaces 11 among the image information formed by the image processing device 202 is superimposed, and the image information corresponding to the center mark is located at the middle position of the entire image information.
If at least one of the ray generating device 201 and the image processing device 202 is not over against the isocenter of the main body 1 so that the image information corresponding to the center marks of the pair of positioning surfaces 11 is deviated, and/or the image information corresponding to the center marks is not located at the middle position of the whole image information, at this time, the positions of the image processing device 202 and/or the ray generating device 201 are adjusted so that the image information corresponding to the center marks of the pair of positioning surfaces 11 in the image information formed by the image processing device 202 is overlapped, and the image information corresponding to the center marks is located at the middle position of the whole image information, thereby ensuring that both the ray generating device 201 and the image processing device 202 in the detection assembly 200 are over against the center point of the main body 1.
The invention also provides a debugging method of the imaging system, which can be applied to the imaging system. The debugging method of the imaging system comprises a step S01 and a step S02, and can also comprise a step S03 and a step S04.
In step S01, the calibration device 100 is mounted, and the deviation between the mechanical isocenter indicated by the calibration device 100 and the theoretical isocenter is satisfied.
In step S02, the light generating device 3 generates light, and drives the detecting component 200 to be located on the extending path of the light generated by the light generating device 3.
In step S03, a reflecting surface 203 is disposed on a side of the ray generating device 201 facing the calibration device 100 and/or on a side of the image processing device 202 facing the calibration device 100, the reflecting surface 203 is disposed on an extended path of the light to reflect the light, and the ray generating device 201 and/or the image processing device 202 is rotated such that an outgoing path of the light coincides with the reflected path.
In step S04, the radiation generating device 201 generates radiation passing through the light-transmitting channel 12 and the positioning surfaces 11 located on opposite sides of the light-transmitting channel 12, the image processing device 202 receives the radiation generated by the radiation generating device 201 and generates corresponding image information, and positions of the radiation generating device 201 and/or the image processing device 202 are adjusted so that image portions corresponding to center marks of a pair of positioning surfaces 11 in the image information generated by the image processing device 202 overlap, and the image information corresponding to the center marks is located in a middle position of the whole image information.
In step S01, after the calibration device 100 is installed, the detection method of the calibration device 100 may be used to detect whether the deviation between the mechanical isocenter position indicated by the calibration device 100 and the theoretical isocenter position of the imaging system exceeds the allowable value, and when the deviation between the mechanical isocenter position and the theoretical isocenter position of the imaging system is within the allowable value, the detection module 200 may then adjust the mechanical isocenter position indicated by the calibration device 100.
In step S02, the light generating device 3 generates light, and the light generated by the light generating device 3 may be emitted toward the radiation generating device 201 or the image processing device 202 in the detection assembly 200, and the radiation generating device 201 or the image processing device 202 in the detection assembly 200 is moved so that the radiation generating device 201 or the image processing device 202 is located on the extending path of the light. At this time, the position of the ray generating device 201 or the image processing device 202 may be initially adjusted according to the extending path of the light, so that the ray generating device 201 or the image processing device 202 is approximately opposite to the light, and thus the initial adjustment of the ray generating device 201 or the image processing device 202 is realized.
In step S03, the side of the radiation generating device 201 facing the calibration device 100 and the side of the image processing device 202 facing the calibration device 100 may be provided with the reflecting surfaces 203, respectively. When two detection modules 200 are provided, the angles of the radiation generating device 201 and the image processing device 202 in one detection module 200 may be adjusted first, and when the adjustment of the radiation generating device 201 and the image processing device 202 in one detection module 200 is completed, the adjustment of the radiation generating device 201 and the image processing device 202 in the other detection module 200 may be performed.
When one of the detecting units 200 is adjusted, the reflecting surface 203 is first disposed on the side of the ray generating device 201 facing the calibration device 100, the ray generating device 3 corresponding to the ray generating device 201 is turned on, the ray generating device 3 generates the ray emitted toward the ray generating device 201, and the ray generating device 201 is rotated so that the incident path of the ray coincides with the reflecting path formed by the ray reflected by the reflecting surface 203. The reflecting surface 203 is disposed on the side of the image processing device 202 facing the calibration device 100, the light generating device 3 corresponding to the image processing device 202 is turned on, the light generating device 3 generates light emitted toward the image processing device 202, and the image processing device 202 is rotated so that the incident path of the light coincides with the reflecting path formed after the light is reflected by the reflecting surface 203.
After the adjustment in step S03, the rotation error of the ray generating device 201 and the image processing device 202 with respect to the isocenter of the imaging system can be eliminated, and the positional accuracy of the ray generating device 201 and the image processing device 202 can be improved.
In step S04, the angles of the radiation generating device 201 and the image processing device 202 in the two detecting devices are adjusted, and then the reflecting surface 203 and the radiation generating device 3 are removed. The radiation generating device 201 in one detection assembly 200 generates radiation, passes through the light transmission channel 12 and the pair of positioning surfaces 11 of the main body part 1 of the calibration device 100, projects the radiation to the image processing device 202 and forms corresponding image information, and adjusts the positions of the radiation generating device 201 and/or the image processing device 202 so that the corresponding positions of the pair of positioning surfaces 11 in the image information generated by the image processing device 202 are overlapped, and the image information corresponding to the center mark is positioned in the middle position of the whole image information.
After the adjustment in step S04, the translational error of the ray generating device 201 and the image processing device 202 relative to the isocenter of the imaging system can be eliminated, so that the positional accuracy of the ray generating device 201 and the image processing device 202 is ensured.
The steps S01 to S04 may be performed sequentially or the execution order may be adjusted as needed, and for example, the steps S01, S04, S02, and S03 may be performed sequentially.
The present invention also provides a radiation therapy device comprising the detection assembly 200 described above. The detection component 200 is debugged by the debugging method of the detection component 200. After the detection assembly 200 is debugged, the radiotherapy equipment determines the body position and the tumor position of the patient through the image acquired by the detection assembly 200, so that the particle beam of the radiotherapy equipment can be ensured to accurately irradiate the tumor area of the patient.
While embodiments of the present invention have been shown and described, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that changes, modifications, substitutions and alterations may be made therein by those of ordinary skill in the art without departing from the spirit and scope of the invention, all such changes being within the scope of the appended claims.
Claims (13)
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