CN115420192B - Measuring device and measuring method for quantitatively detecting sensitivity of OCT system - Google Patents
Measuring device and measuring method for quantitatively detecting sensitivity of OCT system Download PDFInfo
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- A61B3/102—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for optical coherence tomography [OCT]
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Abstract
The invention discloses a measuring device and a measuring method for quantitatively detecting the sensitivity of an OCT system, wherein the measuring device comprises: the device comprises a base, a catheter fixing shaft, a circumferential rotating device, a distance adjusting device, an angle adjusting device, a fixing seat and an adjusting rod piece, wherein an imaging catheter is inserted into the catheter fixing shaft; the end part of the imaging catheter extends to the front of the catheter fixing shaft and is used for emitting light beams laterally; the circumference rotator, the distance adjusting device and the angle adjusting device cooperate to adjust the plane reflector arranged on the fixed seat, the randomness of emergent light of the imaging guide pipe can be overcome in the testing process, the plane reflector is aligned to the light emergent light path of the imaging guide pipe, and the plane reflector is rotated to a position vertical to the light emergent direction of the imaging guide pipe; the attenuator is arranged on the adjusting rod piece, and the attenuator is moved between the plane mirror and the imaging catheter, so that the maximum signal-to-noise ratio of the mirror surface signal reflected by the plane mirror is obtained, and the accuracy of the sensitivity measurement of the OCT system is improved.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a measuring device and a measuring method for quantitatively detecting the sensitivity of an OCT system.
Background
The Optical Coherence Tomography (OCT) is a technique that uses near-infrared light and Optical interference principles to perform interference imaging on back-reflected or scattered light signals of a sample at different depth levels to incident near-infrared light and light signals returned by a reference arm, and then scans and pulls back the back to obtain a high-resolution image of a two-dimensional and three-dimensional structure of the sample. OCT has the advantages of non-invasive, high resolution, and in vivo imaging, and is now widely used in clinical diagnosis and research in ophthalmology, dermatology, and cardiovascular medicine.
System sensitivity refers to the minimum reflectance of the sample that the system can detect. The OCT system has high sensitivity, can image a tiny object with weak reflection, and has direct correlation with image quality as an important system parameter, so that the quantitative measurement of the sensitivity of the OCT system is very necessary. The prior publication numbers are: CN112763190A provides an OCT sensitivity measuring method.
Basic working principle of OCT system: laser emitted by the swept-frequency laser source passes through the optical fiber coupler and is divided into two paths, namely a reference arm and a sample arm, wherein a reflector is placed on the reference arm, and light is reflected back to the system through the reflector; and the other path of sample arm is connected with the imaging guide pipe through a rotating part, the imaging guide pipe sends laser to the sample and then receives the optical signal returned from the sample, and the optical path difference is matched to enable the two paths of returned optical signals to interfere and image. The plane mirror is used as a probing sample, the signal-to-noise ratio of the mirror signal is measured by receiving the mirror signal reflected by the plane mirror, and the sensitivity of the OCT system can be measured by adding the two-way attenuation value of the known attenuator and the reflectivity of the plane mirror.
However, the OCT system includes an internal optical path and an external optical path externally connected to the imaging catheter, both of which affect the sensitivity of the OCT system, and when the OCT system is externally connected to the imaging catheter, because the light-emitting direction of the imaging catheter is random, it cannot be ensured that the mirror surface of the plane mirror is perpendicular to the light-emitting optical path of the imaging catheter, so that the maximum signal-to-noise ratio of the mirror surface signal cannot be obtained during the test process, and the accuracy of the sensitivity measurement of the OCT system is affected.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the above defects in the prior art, an object of the present invention is to provide a measuring apparatus for quantitatively detecting the sensitivity of an OCT system and a measuring method thereof, so as to solve the problems that the light-emitting direction of an imaging catheter has randomness in the existing measuring process, the maximum signal-to-noise ratio of a mirror signal cannot be ensured, and the accuracy of the sensitivity measurement of the OCT system is affected.
The technical scheme of the invention is as follows:
a measuring device for quantitatively detecting the sensitivity of an OCT system, which comprises: the device comprises a base, a conduit fixing shaft, a circumferential rotating device, a distance adjusting device, an angle adjusting device, a fixing base, a plane reflector, an adjusting rod piece and an attenuator, wherein the conduit fixing shaft is arranged on the base, a central channel is formed in the conduit fixing shaft in a hollow mode, and the central channel is used for inserting an imaging conduit; the end part of the imaging catheter extends out of the front of the catheter fixing shaft and is used for emitting light beams laterally; the circumference rotating device is arranged on the base, and a rotating disc capable of rotating around the catheter fixing shaft is movably arranged on the circumference rotating device; the distance adjusting device is fixedly arranged on the rotating disc, a sliding platform is arranged on the distance adjusting device, and the sliding direction of the sliding platform is tangential to the circumferential direction of the rotating disc; the angle adjusting device is fixedly arranged on the sliding platform, a rotating part is arranged on the angle adjusting device, and the rotating part rotates in a plane perpendicular to the rotating disc; the fixed seat is arranged on the rotating part, and a plane mirror is fixedly arranged on the fixed seat; the adjusting rod piece is arranged on the sliding platform; the adjusting rod is provided with an attenuator and is used for moving the attenuator to a position between the plane mirror and the imaging catheter;
the rotating disc is used for driving the plane reflector to rotate around the guide pipe fixing shaft, so that the plane reflector moves to a light emitting path of the imaging guide pipe; the sliding platform is used for driving the plane mirror to move towards or away from the imaging catheter; the rotating part is used for adjusting an included angle between the plane mirror and a light-emitting light path of the imaging guide pipe.
The measuring device for quantitatively detecting the sensitivity of the OCT system is characterized in that a deflection adjusting knob and a pitching adjusting knob are arranged on the fixed seat, and the deflection adjusting knob is used for finely adjusting the deflection angle of the plane mirror; the pitching adjusting knob is used for finely adjusting the pitching angle of the plane mirror.
The measuring device for quantitatively detecting the sensitivity of the OCT system is characterized in that the angle adjusting device comprises an adjusting base station, the side surface of the adjusting base station is fixed on the sliding platform, an arc-shaped concave surface is formed on the adjusting base station, and the rotating piece is matched with the arc-shaped concave surface; a first scale is arranged on the side surface of the adjusting base station departing from the sliding platform; and a second scale is arranged at the position, opposite to the first scale, on the side surface of the rotating part.
The measuring device for quantitatively detecting the sensitivity of the OCT system is characterized in that the adjusting rod piece comprises a fixed plate, a first rotating rod and a second rotating rod, and the fixed plate is fixedly arranged on the sliding platform; the first rotating rod is hinged with the fixed plate and rotates in a plane vertical to the sliding platform; one end of the second rotating rod is hinged with the first rotating rod, and the attenuator is arranged at the other end of the second rotating rod; the second rotating rod is used for adjusting an included angle between the attenuator and a light-emitting light path of the imaging catheter.
The measuring device for quantitatively detecting the sensitivity of the OCT system is characterized in that the attenuator is connected with the second rotating rod in an adhering mode.
The measuring device for quantitatively detecting the sensitivity of the OCT system is characterized in that the length direction of the fixed plate is parallel to the sliding direction of the sliding platform; two strip-shaped holes are formed at intervals along the length direction of the fixing plate; a fixing bolt in threaded connection with the sliding platform is arranged in the strip-shaped hole;
when the fixing bolt is loosened, the fixing plate can be moved to adjust the distance between the attenuator and the plane mirror.
The measuring device for quantitatively detecting the sensitivity of the OCT system is characterized in that the attenuator comprises a neutral density filter.
The application also discloses a measuring method for quantitatively detecting the sensitivity of the OCT system, which is used for the measuring device for quantitatively detecting the sensitivity of the OCT system, wherein the measuring method comprises the following steps:
inserting an imaging catheter of an OCT system to be detected into a catheter fixing shaft for fixing;
adjusting a plane reflector to align the light emergent direction of the imaging guide pipe, and enabling an included angle between the plane reflector and the light emergent light path of the imaging guide pipe to be 90 degrees;
moving an attenuator between the plane mirror and the imaging catheter;
and measuring the signal-to-noise ratio of the mirror surface signal reflected by the plane reflector, and calculating the system sensitivity of the OCT system to be measured.
The measuring method for quantitatively detecting the sensitivity of the OCT system, wherein the adjusting the plane mirror to align with the light exit direction of the imaging catheter, and the making of an included angle of 90 ° between the plane mirror and the light exit path of the imaging catheter specifically includes:
the rotating disc is shifted, and the plane mirror is moved to a light emergent path of the imaging guide pipe;
the rotating piece is shifted until the included angle between the plane reflecting mirror and the light emergent path of the imaging guide pipe is 90 degrees;
and analyzing the mirror surface signal reflected by the plane reflector, and adjusting the rotating disc and the rotating piece according to the peak height of the mirror surface signal after Fourier transform until the peak value of the mirror surface signal after Fourier transform reaches the maximum value.
The measuring method for quantitatively detecting the sensitivity of the OCT system comprises the following steps of:
swinging an adjustment lever to move an attenuator between the plane mirror and the imaging catheter;
and adjusting the inclination angle of the attenuator to ensure that no attenuator signal exists on the image of the mirror signal.
Compared with the prior art, the embodiment of the invention has the following advantages:
the measuring device for quantitatively detecting the sensitivity of the OCT system disclosed by the invention has the advantages that the position of the plane reflecting mirror on the fixed seat is controlled by arranging the circumferential rotating device, the distance adjusting device, the angle adjusting device and the like, so that the effect of adjusting the distance or the angle between the plane reflecting mirror and the light emergent direction of the imaging catheter is achieved; in the testing process, the method can adapt to the randomness of the side light-emitting of the imaging guide tube, and the emergent light of the imaging guide tube is vertically incident on the plane reflector, so that the aim of obtaining the maximum signal-to-noise ratio of a mirror signal is fulfilled, and the reliability of a measuring result is ensured.
In addition, when the light beam emitted by the imaging guide tube vertically irradiates on the plane reflector, the photoelectric detector can be saturated by the complete reflection of the mirror surface, and the acquisition and analysis of mirror surface signals are not facilitated, so that under the condition that the alignment of the imaging guide tube and the plane reflector is well adjusted, the adjusting rod is arranged to move the attenuator between the plane reflector and the imaging guide tube, the attenuation value is adjusted according to needs, the intensity of the optical signal is reduced, the accuracy of the final measurement result is favorably improved, and the reliability of the measurement result is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a measuring device for quantitatively detecting the sensitivity of an OCT system in the invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a flow chart of the measurement method for quantitatively detecting the sensitivity of the OCT system according to the present invention;
FIG. 4 is a schematic diagram of a measuring device for quantitatively detecting the sensitivity of an OCT system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the measurement device for quantitatively detecting the sensitivity of the OCT system in another embodiment of the invention.
10, a base; 20. a catheter securing shaft; 21. a central channel; 30. an imaging catheter; 40. a circumferential rotation device; 41. rotating the disc; 50. a distance adjusting device; 51. a sliding platform; 60. an angle adjusting device; 61. a rotating member; 611. a second scale; 62. adjusting the base station; 621. an arc-shaped concave surface; 622. a first scale; 70. a fixed seat; 80. a plane mirror; 90. adjusting the rod piece; 91. a fixing plate; 911. a strip-shaped hole; 912. fixing the bolt; 92. a first rotating lever; 93. a second rotating lever; 100. an attenuator; 110. a deflection adjustment knob; 120. a pitch adjustment knob.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1, in an embodiment of the present invention, a measuring apparatus for quantitatively detecting the sensitivity of an OCT system is disclosed, wherein the measuring apparatus comprises: the imaging catheter fixing device comprises a base 10, a catheter fixing shaft 20, a circumferential rotating device 40, a distance adjusting device 50, an angle adjusting device 60, a fixing seat 70, a plane mirror 80, an adjusting rod 90 and an attenuator 100, wherein the catheter fixing shaft 20 is arranged on the base 10, a central channel 21 is formed in the hollow part of the catheter fixing shaft 20, the central channel 21 is used for penetrating through an imaging catheter 30, and the imaging catheter 30 is fixed through friction of the side wall of the central channel 21 or interference fit of the central channel 21 and the imaging catheter 30; the end of the imaging catheter 30 extends out of the front of the catheter fixing shaft 20 for emitting light beams laterally; specifically, the catheter fixing shaft 20 penetrates through two sides of the base 10, the imaging catheter 30 is inserted into the catheter fixing shaft 20 from one side of the base 10 and extends out of the other side of the base 10 to the front of the catheter fixing shaft 20, and a lateral light outlet is formed in the extending part of the imaging catheter 30 to emit light beams in random directions.
The circumference rotating device 40 is arranged on the base 10, and a rotating disc 41 which can rotate around the catheter fixing shaft 20 is movably arranged on the circumference rotating device 40. As shown in fig. 1, the circular rotation device 40 includes a fixed portion and a rotating portion, four corners of the fixed portion are fixedly mounted on the base 10 by bolts, and the rotating portion is a rotating disk 41 assembled with the fixed portion to be rotatable thereon. When the rotating disc 41 is operated to rotate, the distance adjusting device 50, the angle adjusting device 60, the fixing seat 70 and the plane mirror 80 can be driven to rotate around the catheter fixing shaft 20 together, so that the position of the plane mirror 80 is roughly adjusted, the plane mirror 80 is moved to the light outgoing path of the imaging catheter 30, and initial alignment is realized.
As shown in fig. 1, the distance adjusting device 50 is fixedly disposed on the rotating disc 41, and a sliding platform 51 is disposed on the distance adjusting device 50, and a sliding direction of the sliding platform 51 is tangential to a circumferential direction of the rotating disc 41. The distance adjusting device 50 comprises a part fixed on the rotating disc 41 and a part sliding relative to the rotating disc 41, a plurality of mounting hole positions are arranged on the rotating disc 41, the fixed part of the distance adjusting device 50 is assembled with the mounting hole positions through bolts and fixed on the rotating disc 41, and the sliding platform 51 moves along a sliding rail arranged on the fixed part of the distance adjusting device 50. The movable sliding platform 51 can drive the angle adjusting device 60, the fixing seat 70 and the plane mirror 80 to move towards or away from the imaging catheter 30, so as to adjust the distance between the plane mirror 80 and the imaging catheter 30 and ensure that the mirror is located at the optimal imaging position. In addition, it is advantageous to align the plane mirror 80 with the imaging catheter 30 while leaving room for the attenuator 100 to be moved between the plane mirror and the imaging catheter later.
As further shown in fig. 1, the angle adjusting device 60 is fixedly disposed on the sliding platform 51, and a rotating member 61 is disposed on the angle adjusting device 60, wherein the rotating member 61 rotates in a plane perpendicular to the rotating disc 41. In this embodiment, the fixing portion of the angle adjusting device 60 is disposed at the side of the sliding platform 51, and the rotating member 61 can rotate relative to the fixing portion of the angle adjusting device 60 as the sliding platform 51 moves together, so as to change the inclination angles of the fixing base 70 and the plane mirror 80 relative to the catheter fixing shaft 20, adjust the included angle between the plane mirror 80 and the light-emitting path of the imaging catheter 30, and when the light-emitting direction of the imaging catheter 30 is inclined, achieve the vertical alignment between the plane mirror 80 and the light-emitting path.
As shown in fig. 1, the fixing base 70 is disposed on the rotating member 61, and the plane mirror 80 is fixedly disposed on the fixing base 70. The fixing base 70 provided in this embodiment is fixedly coupled to the rotating member 61 by a bolt, and a mounting groove is provided at a side of the fixing base 70 facing the catheter fixing shaft 20 for mounting the plane mirror 80.
Specifically, in this embodiment, by sequentially connecting the circular rotation device 40, the distance adjustment device 50, the angle adjustment device 60, and the fixing base 70, the movement of the plane mirror 80 within three degrees of freedom can be controlled independently of each other, so that no matter where the light-emitting direction of the imaging catheter 30 is inclined, the plane mirror 80 can be perpendicular to the light-emitting direction, so that the plane mirror 80 generates the best reflection effect, and the maximum signal-to-noise ratio of the mirror signal is obtained.
In addition, the adjusting rod 90 is arranged on the sliding platform 51, and the adjusting rod 90 is arranged on the sliding platform 51; the attenuator 100 is disposed on the adjustment lever 90, and the adjustment lever 90 is used to move the attenuator 100 between the plane mirror 80 and the imaging catheter 30. In order to avoid the surface signal of the attenuator 100 interfering with the reflected signal of the plane mirror 80 during the adjustment process, the attenuator 100 is not moved to the light-emitting path of the imaging guide 30, but the attenuator 100 is moved to between the plane mirror 80 and the imaging guide 30 by the adjustment rod 90 under the condition that the alignment of the imaging guide 30 and the plane mirror 80 is well adjusted. And moreover, the attenuation value 100 is adjusted as required, the intensity of the optical signal is properly reduced, and the saturation of the photoelectric detector is avoided, so that an accurate and effective mirror signal can be conveniently acquired, the accuracy of a final measurement result is improved, and the reliability of the measurement result is further improved.
In summary, the measuring device for quantitatively detecting the sensitivity of the OCT system disclosed in the present invention controls the position of the plane mirror 80 on the fixing base 70 by providing the circumferential rotating device 40, the distance adjusting device 50, the angle adjusting device 60, and the like, so as to adjust the distance or the angle between the plane mirror 80 and the light emitting direction of the imaging catheter 30; therefore, in the testing process, the randomness of the side light-emitting of the imaging catheter 30 is adapted, the emergent light of the imaging catheter 30 is vertically incident on the plane mirror 80, and the attenuator 100 is inserted, so that the maximum signal-to-noise ratio of the mirror signal is obtained, the reliability of the measurement result of the sensitivity of the OCT system is ensured, and after the maximum signal-to-noise ratio of the mirror signal is accurately measured, the sensitivity of the OCT system can be accurately calculated by adding the known bidirectional attenuation value of the attenuator 100 and the reflectivity of the plane mirror 80, wherein the unit is dB.
As shown in fig. 1, as an embodiment in the present embodiment, it is disclosed that a yaw adjusting knob 110 and a pitch adjusting knob 120 are disposed on the fixing base 70, and the yaw adjusting knob 110 is used for adjusting a yaw angle of the plane mirror 80; the pitch adjustment knob 120 is used to adjust the pitch angle of the plane mirror 80. In actual operation, the position of the plane mirror 80 can be adjusted back and forth in a large range and at a large angle by adjusting the strokes of the rotating disc 41, the sliding platform 51 and the rotating member 61, but the detection sensitivity of the optical signal is very high. Therefore, the deflection adjusting knob 110 and the pitching adjusting knob 120 are arranged to further finely adjust the mirror surface direction of the reflector after the coarse adjustment plane reflector 80 aligns with the light emergent path of the imaging catheter 30, so that the mirror surface is ensured to be perpendicular to the light emergent direction of the imaging catheter 30, the precision of the testing device is improved, and more accurate testing results can be obtained.
Specifically, as another embodiment in the present embodiment, it is disclosed that the angle adjusting device 60 includes an adjusting base 62 whose side surface is fixed on the sliding platform 51, an arc concave surface 621 is formed on the adjusting base 62, and the rotating member 61 is adapted to the arc concave surface 621; a first scale 622 is arranged on the side surface of the adjusting base 62 departing from the sliding platform 51; a second scale 611 is provided on a side surface of the rotation member 61 at a position opposite to the first scale 622. The first scale 622 and the second scale 611 are provided in this embodiment to facilitate the operator to know and record the rotation angle of the rotating member 61, and accurately collect the test data during the measurement process.
As shown in fig. 2, as another embodiment in this embodiment, it is disclosed that the adjusting lever 90 includes a fixed plate 91, a first rotating lever 92 and a second rotating lever 93, and the fixed plate 91 is fixedly disposed on the sliding platform 51 and functions as a support. The first rotating rod 92 is hinged to the fixed plate 91 and rotates in a plane perpendicular to the sliding platform 51; specifically, in the present embodiment, the first rotating rod 92 is hinged to the fixing plate 91 through a bolt, and the second rotating rod 93 and the attenuator 100 on the second rotating rod 93 are driven to rotate by the first rotating rod 92. One end of the second rotating rod 93 is hinged with the first rotating rod 92, and the other end is provided with the attenuator 100; the second rotatable lever 93 is used to adjust the angle of the attenuator 100 to the exit light path of the imaging catheter 30. Specifically, the second rotating rod 93 is connected to the first rotating rod 92 by a bolt, and the second rotating rod 93 can freely rotate along the axial direction thereof by loosening the bolt, so as to drive the attenuator 100 to deflect.
In this embodiment, the attenuator 100 is driven by the first rotating rod 92 and the second rotating rod 93 to be inserted between the imaging catheter 30 and the plane mirror 80, so as to adjust the intensity of the mirror signal reflected by the plane mirror 80, thereby avoiding the occurrence of saturation of the photodetector; and the second rotating rod 93 can adjust the inclination angle of the attenuator 100 to avoid the surface signal of the attenuator 100 from interfering the mirror signal, so that the final generated measurement result image of the mirror signal has no signal of the attenuator 100, or the signal of the attenuator 100 is weak, and the measurement of the mirror signal is not affected.
Specifically, as another embodiment of the present embodiment, it is disclosed that the attenuator 100 is adhesively attached to the second rotating lever 93. The attenuator 100 can be firmly fixed to the second rotating lever 93 by adhesion, so that the attenuator 100 is kept stable and prevented from falling off during the rotation of the attenuator 100 with the first rotating lever 92 or the rotation of the attenuator with the second rotating lever 93.
As shown in fig. 2, as another embodiment in the present embodiment, it is disclosed that the length direction of the fixing plate 91 is parallel to the sliding direction of the sliding platform 51; two strip-shaped holes 911 are formed at intervals along the length direction of the fixing plate 91; a fixing bolt 912 which is screwed with the sliding platform 51 is arranged in the strip-shaped hole 911; when the fixing bolt 912 is loosened, the fixing plate 91 may be moved to adjust the distance between the attenuator 100 and the plane mirror 80.
In the adjusting or measuring process, if the distance between the attenuator 100 and the plane mirror 80 needs to be adjusted, the fixing bolt 912 can be rotated reversely at any time to loosen the fixing bolt 912, and the fixing plate 91 becomes movable after losing the pressing force and can move along the sliding direction of the sliding platform 51, so as to drive the first rotating rod 92, the second rotating rod 93 and the attenuator 100 to move together, i.e. the fixing plate 91 plays a role in adjusting the position of the attenuator 100, thereby achieving the purpose of adjusting the distance between the attenuator 100 and the plane mirror 80 in real time.
Specifically, as another implementation manner in this embodiment, it is disclosed that the attenuator 100 includes a neutral density filter. The neutral density filter has stable attenuation value in the working waveband range of the sweep frequency laser source, has stable adjusting effect on optical signals, improves the transmission stability of the optical signals in the measuring process, and is beneficial to obtaining accurate and effective measuring data.
It should be noted that the present embodiment is only an example of the type of the attenuator 100, but the protection scope of the present invention is not limited thereto, and other types of attenuators 100 are also within the protection scope of the present invention as long as the technical effects disclosed in the present application can be achieved.
Specifically, the attenuator is disposed between the imaging catheter 30 and the plane mirror 80 in the present embodiment, as shown in fig. 4; in addition, in another embodiment of the present application, it is disclosed that the attenuator 100 may be disposed at one end of the imaging catheter 30 connected to the sample arm, as shown in fig. 5, in this case, the attenuator 100 may select a fiber optic attenuator 100 commonly used in the communication industry according to the way of the joint of the imaging catheter 30, or select a suitable attenuating fiber to make the fiber optic attenuator 100 match with the joint of the imaging catheter 30, according to this scheme, the operation of adjusting the attenuator 100 in a narrow space between the imaging catheter 30 and the plane mirror 80 may be omitted, and the adjustment time may be shortened.
As shown in fig. 3, as another embodiment of the present application, a measuring method for quantitatively detecting the sensitivity of an OCT system is disclosed, which is used in any one of the measuring apparatuses for quantitatively detecting the sensitivity of an OCT system, and the measuring method includes:
s100, inserting the imaging catheter 30 of the OCT system to be measured into the catheter fixing shaft 20 for fixing;
s200, adjusting a plane mirror 80 to align to the light emergent direction of the imaging guide pipe 30, and enabling an included angle between the plane mirror 80 and the light emergent path of the imaging guide pipe 30 to be 90 degrees;
s300, moving an attenuator 100 to a position between the plane mirror 80 and the imaging catheter 30;
s400, measuring the signal-to-noise ratio of the mirror surface signal reflected by the plane mirror 80, and calculating the system sensitivity of the OCT system to be measured.
The measurement method disclosed in the embodiment obtains the best reflection effect by moving the plane mirror 80, and can acquire the maximum signal-to-noise ratio of the mirror surface signal, so that the system sensitivity of the whole set of system including the internal and external optical paths of the OCT can be accurately calculated.
Specifically, as an implementation manner in this embodiment, it is disclosed that the S200 specifically includes:
s210, the rotating disc 41 is shifted until the plane mirror 80 is aligned with the light emergent direction of the imaging guide pipe 30;
s220, the rotating piece 61 is shifted until the included angle between the plane reflecting mirror 80 and the light emergent path of the imaging guide pipe 30 is 90 degrees;
and S230, analyzing the mirror surface signal reflected by the plane mirror 80, and adjusting the rotating disc 41 and the rotating piece 61 according to the peak height of the mirror surface signal after Fourier transform until the peak value of the mirror surface signal after Fourier transform reaches the maximum value.
The position and the angle of the plane reflecting mirror 80 are regulated and controlled through the combination of the rotating disc 41 and the rotating piece 61, but only the position in one degree of freedom is regulated at each time, so that the control precision of the regulating process is improved, the regulating process of the plane reflecting mirror 80 is accurate and efficient, the operation is convenient, and the regulation time is saved.
Specifically, as another implementation manner in this embodiment, it is disclosed that the S300 specifically includes:
s310, swinging the adjusting rod 90 to move the attenuator 100 between the plane mirror 80 and the imaging catheter 30;
s320, adjusting the inclination angle of the attenuator 100 to ensure that no attenuator 100 signal exists on the image of the mirror signal.
By swinging the adjustment lever 90, the attenuator 100 can be inserted between the imaging catheter 30 and the plane mirror 80 after the alignment adjustment, so as to avoid affecting the position and angle adjustment process of the plane mirror 80.
In summary, the present application discloses a measuring device for quantitatively detecting the sensitivity of an OCT system, wherein the measuring device comprises: the device comprises a base 10, a catheter fixing shaft 20, a circumferential rotating device 40, a distance adjusting device 50, an angle adjusting device 60, a fixing seat 70, a plane mirror 80, an adjusting rod 90 and an attenuator 100, wherein the catheter fixing shaft 20 is arranged on the base 10, a central channel 21 is formed in the hollow part of the catheter fixing shaft 20, and the central channel 21 is used for inserting an imaging catheter 30; the end of the imaging catheter 30 extends forward of the catheter fixation shaft 20 for lateral beam exit; the circumference rotating device 40 is arranged on the base 10, and a rotating disc 41 which can rotate around the catheter fixing shaft 20 is movably arranged on the circumference rotating device 40; the distance adjusting device 50 is fixedly arranged on the rotating disc 41, a sliding platform 51 is arranged on the distance adjusting device 50, and the sliding direction of the sliding platform 51 is tangential to the circumferential direction of the rotating disc 41; the angle adjusting device 60 is fixedly arranged on the sliding platform 51, a rotating piece 61 is arranged on the angle adjusting device 60, and the rotating piece 61 rotates in a plane perpendicular to the rotating disc 41; the fixed seat 70 is arranged on the rotating part 61, and a plane mirror 80 is fixedly arranged on the fixed seat 70; the adjusting rod 90 is arranged on the sliding platform 51; an attenuator 100 is disposed on the adjustment lever 90, and the adjustment lever 90 is used for moving the attenuator 100 between the plane mirror 80 and the imaging catheter 30;
the rotating disc 41 is configured to drive the plane mirror 80 to rotate around the catheter fixing shaft 20, so that the plane mirror 80 moves to the light emitting path of the imaging catheter 30; the sliding platform 51 is used for driving the plane mirror 80 to move in a direction towards or away from the imaging catheter 30; the rotating part 61 is used for adjusting an included angle between the plane mirror 80 and the light-emitting path of the imaging guide tube 30.
The measuring device for quantitatively detecting the sensitivity of the OCT system disclosed by the invention plays a role in adjusting the distance or the angle between the plane reflector 80 and the light-emitting direction of the imaging catheter 30 by arranging the position of the plane reflector 80 on the control fixing seat 70 of the circumferential rotating device 40, the distance adjusting device 50, the angle adjusting device 60 and the like; in the testing process, the randomness of the side light-emitting of the imaging guide tube 30 can be adapted, so that the emergent light of the imaging guide tube 30 is vertically incident on the plane mirror 80; under the condition that the alignment between the imaging catheter 30 and the plane mirror 80 is well adjusted, the adjusting rod 90 is arranged to move the attenuator 100 between the plane mirror 80 and the imaging catheter 30, the attenuation value is adjusted as required, and the intensity of the optical signal is reduced, so that the maximum signal-to-noise ratio of the mirror surface signal is obtained, the accuracy of the final measurement result is improved, and the reliability of the measurement result is improved.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that, the present invention takes the measuring device for quantitatively detecting the sensitivity of the OCT system as an example to describe the specific structure and the operation principle of the present invention, but the application of the present invention is not limited to the measuring device for quantitatively detecting the sensitivity of the OCT system, and the present invention can also be applied to the detection and use of other similar workpieces.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A measuring device for quantitatively detecting the sensitivity of an OCT system, comprising:
a base;
the catheter fixing shaft is arranged on the base, a central channel is formed in the hollow part of the catheter fixing shaft, and the central channel is used for inserting an imaging catheter; the end part of the imaging catheter extends out of the front of the catheter fixing shaft and is used for emitting light beams laterally;
the circumference rotating device is arranged on the base, and a rotating disc capable of rotating around the catheter fixing shaft is movably arranged on the circumference rotating device;
the distance adjusting device is fixedly arranged on the rotating disc, a sliding platform is arranged on the distance adjusting device, and the sliding direction of the sliding platform is tangential to the circumferential direction of the rotating disc;
the angle adjusting device is fixedly arranged on the sliding platform and is provided with a rotating part which rotates in a plane vertical to the rotating disc;
the fixed seat is arranged on the rotating part, and a plane reflecting mirror is fixedly arranged on the fixed seat;
the adjusting rod piece is arranged on the sliding platform; the adjusting rod is provided with an attenuator and is used for moving the attenuator to a position between the plane mirror and the imaging catheter;
the rotating disc is used for driving the plane reflector to rotate around the guide pipe fixing shaft, so that the plane reflector moves to a light emitting path of the imaging guide pipe; the sliding platform is used for driving the plane mirror to move towards or away from the imaging catheter; the rotating part is used for adjusting an included angle between the plane mirror and a light-emitting light path of the imaging guide pipe.
2. The apparatus for quantitatively detecting the sensitivity of OCT system of claim 1, wherein the fixed base is provided with a deflection adjusting knob and a pitch adjusting knob, the deflection adjusting knob is used for finely adjusting the deflection angle of the plane mirror; the pitching adjusting knob is used for finely adjusting the pitching angle of the plane mirror.
3. The apparatus for quantitatively measuring the sensitivity of the OCT system of claim 2, wherein the angle adjusting device comprises an adjusting base fixed laterally on the sliding platform, the adjusting base having an arc-shaped concave surface formed thereon, and the rotation member being adapted to the arc-shaped concave surface;
the side surface of the adjusting base station, which is far away from the sliding platform, is provided with a first scale; and a second scale is arranged on the side surface of the rotating part at a position opposite to the first scale.
4. The apparatus of claim 1, wherein the adjustment lever comprises:
the fixed plate is fixedly arranged on the sliding platform;
the first rotating rod is hinged with the fixed plate and rotates in a plane vertical to the sliding platform; and
one end of the second rotating rod is hinged with the first rotating rod, and the attenuator is arranged at the other end of the second rotating rod; the second rotating rod is used for adjusting an included angle between the attenuator and a light-emitting light path of the imaging catheter.
5. The apparatus of claim 4, wherein the attenuator is bonded to the second rotating rod.
6. The apparatus for quantitatively measuring the sensitivity of OCT system of claim 4, wherein the length direction of the fixed plate is parallel to the sliding direction of the sliding platform; two strip-shaped holes are formed at intervals along the length direction of the fixing plate; a fixing bolt in threaded connection with the sliding platform is arranged in the strip-shaped hole;
when the fixing bolt is loosened, the fixing plate may be moved to adjust a distance between the attenuator and the plane mirror.
7. The apparatus of any of claims 4 to 6, wherein the attenuator comprises a neutral density filter.
8. A measuring method for quantitatively detecting the sensitivity of an OCT system, which is used in the measuring apparatus for quantitatively detecting the sensitivity of an OCT system according to any one of claims 1 to 7, comprising:
inserting an imaging catheter of an OCT system to be detected into a catheter fixing shaft for fixing;
adjusting a plane reflector to align the light emergent direction of the imaging guide pipe, and enabling an included angle between the plane reflector and the light emergent light path of the imaging guide pipe to be 90 degrees;
moving an attenuator between the plane mirror and the imaging catheter;
and measuring the signal-to-noise ratio of the mirror surface signal reflected by the plane reflector, and calculating the system sensitivity of the OCT system to be measured.
9. The method as claimed in claim 8, wherein the adjusting the plane mirror to be aligned with the light-emitting direction of the imaging catheter so that the included angle between the plane mirror and the light-emitting path of the imaging catheter is 90 ° specifically comprises:
the rotating disc is shifted, and the plane reflecting mirror is moved to the light emitting path of the imaging guide pipe;
the rotating piece is shifted until the included angle between the plane reflecting mirror and the light emergent path of the imaging guide pipe is 90 degrees;
and analyzing the mirror surface signal reflected by the plane mirror, and adjusting the rotating disc and the rotating piece according to the peak value height of the mirror surface signal after Fourier transform until the peak value of the mirror surface signal after Fourier transform reaches the maximum value.
10. The method of claim 9, wherein the moving the attenuator between the plane mirror and the imaging catheter comprises:
swinging an adjustment lever to move an attenuator between the plane mirror and the imaging catheter;
and adjusting the inclination angle of the attenuator to ensure that no attenuator signal exists on the image of the mirror signal.
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