Method of aligning medical equipment

Abstract

The application provides an alignment method of medical equipment, comprising: installing a laser to make a light beam emitted by the laser pass through working areas of a first medical equipment and a second medical equipment; installing an optical element in the first medical equipment and / or the second medical equipment to make the light beam form a light signal after passing through the optical element; and adjusting positions of the first medical equipment or the second medical equipment according to the light signal until a deviation of central axes of the first medical equipment and the second medical equipment is within a set range. It can be seen that the application uses light conversion of the optical element to obtain the light signal. The light signal contains deviation information of the central axes of the first medical equipment and the second medical equipment. Therefore, according to the light signal as the deviation of the central axes of the first medical equipment and the second medical equipment, the alignment precision is high.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an alignment method for medical devices. Background Technology

[0002] With the rapid development of medical imaging technology, ultrasound, MRI, computed tomography (CT), radionuclide imaging, positron emission tomography (PET), and molecular imaging have been widely used in medical diagnosis and can be combined to achieve multimodal imaging and fusion imaging. They can also be used in conjunction with radiotherapy equipment to achieve precise radiotherapy. The coaxiality between the medical devices used in combination has a significant impact on the accuracy of imaging and radiotherapy. For example, in a CT-Linac system, the central axis of the CT gantry needs to be adjusted to a reasonable range with the central axis of the accelerator gantry to achieve unified positioning for imaging and radiotherapy, enabling image-based precision radiotherapy. If the central axis of the CT gantry deviates significantly from that of the accelerator gantry, the radiotherapy location confirmed by the physician in the image will deviate considerably from the actual radiotherapy location, severely affecting the treatment outcome.

[0003] Current methods for coaxiality adjustment in medical equipment typically involve emitting a laser from the center of one gantry, projecting its position onto the rotating plane of another gantry via a rotating gantry, and then adjusting by comparing the relative positions of the projected center and the center of the projected rotating plane. However, this method is highly dependent on the machining precision of the mechanical structure and the diameter of the laser beam, resulting in low accuracy.

[0004] Therefore, there is an urgent need for a new alignment method for medical devices to improve the accuracy of coaxiality adjustment between medical devices. Summary of the Invention

[0005] The purpose of this invention is to provide an alignment method for medical devices to address how to improve the accuracy of coaxiality adjustment between medical devices.

[0006] To solve the above-mentioned technical problems, the present invention provides an alignment method for a medical device, comprising:

[0007] The laser is installed using mechanical tooling so that the beam emitted by the laser passes through the working areas of the first medical device and the second medical device;

[0008] The aforementioned mechanical tooling is used to install optical elements within the first medical device and / or the second medical device, so that the light beam passes through the optical elements to form an optical signal;

[0009] Based on the optical signal, adjust the position of the first medical device or the second medical device until the deviation of the central axis of the first medical device and the second medical device is within a set range.

[0010] Optionally, in the alignment method of the medical device, the optical element is a perforated plate or an optical lens; the perforated plate or the optical lens is mounted on the first medical device and located on the central axis of the first medical device.

[0011] Optionally, in the alignment method of the medical device, before installing the perforated plate or the optical lens, the alignment method of the medical device includes:

[0012] The laser is installed at the center of the second medical device using the aforementioned mechanical tooling, and the laser beam propagates along the central axis of the second medical device.

[0013] The detector is mounted on the first medical device or on one side of the first medical device using the aforementioned mechanical tooling, so that the detector can receive the light beam;

[0014] The second medical device is rotated, which in turn causes the laser to rotate, so that the beam forms a first spot motion trajectory on the detector;

[0015] Based on the motion trajectory of the first light spot, the position of the laser is adjusted until the motion trajectory of the first light spot acquired by the detector converges to the first fixed point.

[0016] Optionally, in the alignment method of the medical device, after installing the orifice plate, the alignment method of the medical device includes:

[0017] The light beam is diffracted through the aperture plate and forms a diffracted spot on the detector; wherein the optical signal includes the diffracted spot;

[0018] Based on the diffraction spot, adjust the position of the first medical device or the second medical device until the deviation of the central axis of the first medical device and the second medical device is within a set range.

[0019] Optionally, in the alignment method for the medical device, the process of adjusting the position of the first medical device or the second medical device according to the diffraction spot until the deviation of the central axis of the first medical device and the second medical device is within a set range includes:

[0020] The shape of the obtained diffraction spot is compared with the pre-calibrated spot shape to determine the deflection angle, pitch angle and displacement of the first medical device or the second medical device.

[0021] Based on the deflection angle, the pitch angle, and the displacement, adjust the position of the first medical device or the second medical device until the deviation of the central axis of the first medical device and the second medical device is within a set range.

[0022] Optionally, in the alignment method for the medical device, the process of adjusting the position of the first medical device or the second medical device according to the diffraction spot until the deviation of the central axis of the first medical device and the second medical device is within a set range includes:

[0023] Determine whether the light intensity of the diffraction spot is at its maximum value. If not, adjust the position of the first medical device or the second medical device until the light intensity of the diffraction spot reaches its maximum value.

[0024] Determine whether the shape of the diffraction spot is circular. If not, adjust the position of the first medical device or the second medical device until the shape of the diffraction spot is circular.

[0025] Optionally, in the alignment method of the medical device, after the optical lens is installed, the alignment method of the medical device includes:

[0026] The light beam is refracted by the optical lens and forms a refracted spot on the detector;

[0027] The first medical device is rotated, which in turn causes the optical lens to rotate, so as to form a second light spot motion trajectory on the detector;

[0028] Based on the motion trajectory of the second light spot, adjust the position of the optical lens until the motion trajectory of the second light spot acquired by the detector converges to the second fixed point;

[0029] At least the position coordinates of the first fixed point and the second fixed point are obtained, and the deflection angle, pitch angle and displacement of the first medical device or the second medical device are determined based on the position coordinates;

[0030] Based on the deflection angle, the pitch angle, and the displacement, adjust the position of the first medical device or the second medical device until the deviation of the central axis of the first medical device and the second medical device is within a set range;

[0031] The optical signal includes the position coordinates of the first fixed point and the second fixed point.

[0032] Optionally, in the alignment method of the medical device, the optical element is a plurality of mirrors; and both the first and second medical devices have an inner cavity as a corresponding working area; the plurality of mirrors are spaced apart and mounted on the cavity walls of the first and second medical devices, so that the light beam is reflected sequentially by the mirrors and passes through the working areas of the first and second medical devices; wherein at least two of the plurality of mirrors are respectively disposed on a radial plane at the center position of the working area of ​​the first and second medical devices. Optionally, in the alignment method of the medical device, the mirror has a scale mark, and the scale mark is used to mark the dimension in the direction of the central axis of the first medical device or the dimension in the direction of the central axis of the second medical device.

[0033] Optionally, in the alignment method for the medical device, the alignment method includes:

[0034] The laser is installed on the side of the first medical device away from the second medical device, or on the side of the second medical device away from the first medical device, using the aforementioned mechanical tooling.

[0035] The mechanical tooling is used to install multiple mirrors onto the cavity walls of the first medical device and the second medical device;

[0036] The position of the laser is adjusted so that the beam is reflected sequentially by all the reflectors and passes through the working areas of the first medical device and the second medical device;

[0037] Read the scale of the incident light beam on the reflector, and calculate the deflection angle, pitch angle and displacement of the first medical device or the second medical device based on the read scale.

[0038] Based on the deflection angle, the pitch angle, and the displacement, adjust the position of the first medical device or the second medical device until the deviation of the central axis of the first medical device and the second medical device is within a set range;

[0039] The optical signal includes the scale marking the incident light beam on each of the reflectors.

[0040] In summary, this invention provides an alignment method for medical devices, comprising: installing a laser so that a beam emitted by the laser passes through the working areas of a first medical device and a second medical device; installing an optical element within the first medical device and / or the second medical device so that the beam passes through the optical element to form an optical signal; and adjusting the position of the first medical device or the second medical device according to the optical signal until the deviation of the central axes of the first medical device and the second medical device is within a set range. It is evident that this invention utilizes the light conversion function of the optical element to obtain the optical signal. The optical signal contains information about the deviation of the central axes of the first medical device and the second medical device. Therefore, by using the optical signal to adjust the deviation of the central axes of the first medical device and the second medical device, high alignment accuracy is achieved. Attached Figure Description

[0041] Figure 1 This is a flowchart of the alignment method for medical devices in Embodiments 1, 2 and 3 of the present invention.

[0042] Figure 2 This is a schematic diagram of the installation positions of the laser and detector in Embodiment 1 of the present invention.

[0043] Figure 3 This is a schematic diagram of the motion trajectory of the first light spot in Embodiment 1 of the present invention.

[0044] Figure 4 This is a schematic diagram of the first fixed point in Embodiment 1 of the present invention.

[0045] Figure 5 This is a schematic diagram of the installation position of the perforated plate in Embodiment 1 of the present invention.

[0046] Figure 6 This is a schematic diagram of the diffraction spot in Embodiment 1 of the present invention.

[0047] Figure 7 This is a schematic diagram of the installation positions of the orifice plate and detector when aligning with the hospital bed in Embodiment 1 of the present invention.

[0048] Figure 8 This is a schematic diagram of the installation positions of the laser and detector in Embodiment 2 of the present invention.

[0049] Figure 9 This is a schematic diagram of the installation position of the optical lens in Embodiment 2 of the present invention.

[0050] Figure 10 This is a schematic diagram of the motion trajectory of the second light spot in Embodiment 2 of the present invention.

[0051] Figure 11This is a schematic diagram showing the positions of the first and second fixed points in Embodiment 2 of the present invention.

[0052] Figure 12 This is a schematic diagram of the installation positions of the laser and the reflector in Embodiment 3 of the present invention.

[0053] Figure 13 This is a schematic diagram of the central longitudinal section in Embodiment 3 of the present invention.

[0054] Figure 14 This is a schematic diagram of the structure of the reflector in Embodiment 3 of the present invention.

[0055] Figure 15 This is a schematic diagram of the incident angle and exit angle of the light beam in Embodiment 3 of the present invention.

[0056] The attached figures are labeled as follows:

[0057] 11-Laser; 12-Detector; 121-First spot trajectory; 122-First fixed point; 123-Diffraction spot; 124-Second spot trajectory; 125-Second fixed point; 13-Orifice plate; 14-Optical lens; 15-Mirror; 151-Scale mark;

[0058] 21-Computed Tomography (CT) scanner; 211-Central longitudinal section of CT scanner; 22-Linear accelerator; 221-Central longitudinal section of linear accelerator; 23-Hospital bed;

[0059] L1 - Central axis of the linear accelerator; L2 - First axis of the hospital bed; L3 - Second axis of the hospital bed; L4 - Central axis of the computed tomography scanner; O - Origin. Detailed Implementation

[0060] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to facilitate and clearly illustrate the objectives of the embodiments of the present invention. Furthermore, the structures shown in the drawings are often part of the actual structures. In particular, different figures may have different focuses and sometimes use different scales. It should also be understood that, unless specifically stated or indicated, the terms "first," "second," "third," etc., in the specification are only used to distinguish the various components, elements, steps, etc., in the specification, and are not used to indicate the logical or sequential relationships between the various components, elements, steps, etc. Also, the X-axis, Y-axis, and Z-axis directions referred to in this specification are three mutually perpendicular directions in a spatial coordinate system.

[0061] Please see Figure 1 The present invention provides an alignment method for a medical device, comprising:

[0062] Step 1 S10: Install the laser 11 using mechanical tooling so that the beam emitted by the laser 11 passes through the working areas of the first medical device and the second medical device;

[0063] Step 2 S20: Using the aforementioned mechanical tooling, the optical element is installed inside the first medical device and / or the second medical device, so that the light beam passes through the optical element to form an optical signal;

[0064] Step 3 S30: Adjust the position of the first medical device or the second medical device according to the light signal until the deviation of the central axis of the first medical device and the second medical device is within the set range.

[0065] As can be seen, the present invention utilizes the light conversion function of the optical element to obtain the optical signal. The optical signal contains information about the deviation of the central axes of the first medical device and the second medical device. Therefore, by using the optical signal to adjust the deviation of the central axes of the first and second medical devices, high alignment accuracy is achieved.

[0066] The following is in conjunction with the appendix Figures 1-15 The present invention will be further described in detail through Embodiment 1, Embodiment 2 and Embodiment 3.

[0067] <Example 1>

[0068] It should be noted that this embodiment does not limit the types of the first medical device and the second medical device. Optionally, the first medical device may be a radiotherapy device, an imaging diagnostic device, or a hospital bed; the second medical device may be a radiotherapy device or an imaging diagnostic device. For ease of explanation, this embodiment uses a computed tomography scanner as the first medical device and a linear accelerator as the second medical device as an example; and uses a hospital bed as the first medical device and a linear accelerator as the second medical device to specifically illustrate the alignment method of the medical devices provided in this embodiment.

[0069] Please see Figures 1-7 This embodiment provides an alignment method for a medical device, including:

[0070] Step 1 S10: Install the laser 11 using mechanical tooling so that the beam emitted by the laser 11 passes through the working areas of the first medical device and the second medical device.

[0071] The laser beam emitted by the laser 11 has the advantages of high collimation and small divergence angle, which is beneficial for obtaining more accurate measurement data. In this embodiment, the first medical device is a computed tomography (CT) scanner 21, and the second medical device is a linear accelerator 22. It should be noted that both the CT scanner 21 and the linear accelerator 22 have symmetrical structures and annular cavities. These annular cavities are the corresponding scanning diagnostic areas or radiotherapy areas (hereinafter collectively referred to as working areas). Based on this, the central axes of the CT scanner 21 and the linear accelerator 22 are equal to the central axes of their respective working areas, and also their respective rotational axes. For example, if the laser 11 is installed at the center of the working area of ​​the linear accelerator 22, the beam propagates along the central axis L1 of the linear accelerator 22. Furthermore, the CT scanner 21 and the linear accelerator 22 are linearly arranged along the X-axis, thus the beam can pass sequentially through the linear accelerator 22 and the CT scanner 21.

[0072] It should be noted that in this embodiment, the physical coordinate system of the linear accelerator 22 is used as the reference coordinate system, so the direction of the X-axis is the same as the direction of the central axis L1 of the linear accelerator 22. The center position of the linear accelerator 22 refers to the midpoint position of the linear accelerator 22 in the X-axis, Y-axis and Z-axis directions, and since the linear accelerator 22 has a symmetrical structure, the coordinates of the midpoint positions in each direction are the same.

[0073] After the laser 11 is installed, a detector 12 is installed on the side of the computed tomography scanner 21 away from the linear accelerator 22 so that the detector 12 can receive the light beam. Furthermore, the detector 12 can be a photoelectric sensor, an optical camera, or any other device that can be used to observe the light spot pattern.

[0074] Due to limitations in machining precision, the laser 11 cannot be precisely positioned at the center of the linear accelerator 22. Therefore, before performing step S20, the position of the laser 11 needs to be calibrated. Figures 2-4As shown, the linear accelerator 22 is rotated along its central axis L1, causing the laser 11 to rotate around the central axis L1 of the accelerator 22, so that the detector 12 acquires the first light spot motion trajectory 121 formed by the beam. Because the position of the laser 11 is off-center from the linear accelerator 22, the first light spot motion trajectory 121 forms a ring. Finally, based on the first light spot motion trajectory 121, the position of the laser 11 is adjusted until the first light spot motion trajectory 121 acquired by the detector 12 converges to a first fixed point 122. That is, when the laser 11 gets infinitely close to the center of the linear accelerator 22, the ring will converge to a fixed point, thus completing the position calibration of the laser 11. Preferably, the mechanical fixture structure connected to the laser 11 is an optical adjustment seat, which can realize multi-angle position adjustment without disassembling the mechanical fixture structure to adjust the position, improving the convenience of operation. It is evident that the above-described method for calibrating the position of laser 11 can overcome the influence of limitations in machining accuracy on coaxiality adjustment and improve alignment precision.

[0075] Step 2 S20: The optical element is installed in the first medical device and / or the second medical device using the mechanical tooling, so that the light beam passes through the optical element to form an optical signal.

[0076] Please see Figures 5-6 In this embodiment, the optical element is an aperture plate 13. Optionally, the aperture plate 13 is a single-aperture plate, that is, it has only one hole, and the hole is located at the center of the single-aperture plate. The radial dimension of the hole is adjustable to accommodate different adjustment accuracies. Alternatively, the aperture plate 13 has two or more holes, each with a different radial dimension, and different hole sizes can be selected according to the required adjustment accuracy. It should be noted that the aperture diameter of all holes is smaller than the diameter of the beam emitted by the corresponding laser 11, so that the beam can diffract when passing through the holes. Further, a mechanical tooling structure is used to mount the aperture plate 13 onto the first medical device, and it is located on the central axis of the first medical device. Preferably, the aperture plate 13 is mounted at the center of the working area of ​​the computed tomography scanner 21. The beam diffracts through the hole in the aperture plate 13 and forms a diffracted spot 123 on the detector 12. The optical signal includes the diffracted spot 123.

[0077] Step 3 S30: Adjust the position of the first medical device or the second medical device according to the light signal until the deviation of the central axis of the first medical device and the second medical device is within the set range.

[0078] Please continue reading. Figures 5-6 Because the laser 11 is located at the center of the linear accelerator 22, and the aperture of the perforated plate 13 is located at the center of the computed tomography scanner 21, and there is a certain deviation between the central axes of the linear accelerator 22 and the computed tomography scanner 21, the diffraction spot 123 acquired by the detector 12 is not a perfect circle. Therefore, in one embodiment, firstly, diffraction spot images of the linear accelerator 22 and the computed tomography scanner 21 at different relative positions are pre-calibrated. Then, the acquired diffraction spot 123 is compared with the pre-calibrated spot shape to obtain the same diffraction spot 123 shape from a large number of diffraction spot images, thereby obtaining the deflection angle, pitch angle, and displacement of the linear accelerator 22 behind the computed tomography scanner 21. Finally, based on the deflection angle, the pitch angle, and the displacement, the position of the computed tomography scanner 21 is gradually adjusted until the deflection angle, the pitch angle, and the displacement are within the set range, so as to achieve alignment between the central axis L1 of the linear accelerator 22 and the central axis of the computed tomography scanner 21, ensuring better coaxiality between the two.

[0079] When the alignment accuracy requirement is slightly lower, in another embodiment, the operator can determine the approximate deflection angle, pitch angle, and displacement of the computed tomography scanner 21 or the linear accelerator 22 based on experience and the shape of the diffraction spot. Specifically, first, it is determined whether the light intensity of the diffraction spot 123 is at its maximum value. If not, the position of the computed tomography scanner 21 or the linear accelerator 22 is adjusted until the light intensity of the diffraction spot 123 reaches its maximum value. Then, it is determined whether the shape of the diffraction spot 123 is circular. If not, the position of the computed tomography scanner 21 or the linear accelerator 22 is adjusted until the shape of the diffraction spot 123 is circular. Based on this, it indicates that the deflection angle, the pitch angle, and the displacement are within the set range, and the central axis L1 of the linear accelerator 22 and the central axis of the computed tomography scanner 21 are aligned.

[0080] It should be noted that the deflection angle and pitch angle referred to in this embodiment are the angles that the computed tomography scanner 21 needs to be adjusted relative to the linear accelerator 22; or the angles that the linear accelerator 22 needs to be adjusted relative to the computed tomography scanner 21. Specifically, the deflection angle adjustment refers to rotation adjustment with the Z-axis as the rotation axis; the pitch angle adjustment refers to rotation adjustment with the Y-axis as the rotation axis. The displacement adjustment refers to displacement along the X-axis, Y-axis, and Z-axis directions. Generally, the distance between the computed tomography scanner 21 and the linear accelerator 22 in the X-axis direction is a fixed distance and does not require adjustment.

[0081] Please see Figures 6-7 When the first medical device is a hospital bed 23 and the second medical device is a linear accelerator 22, the alignment process of the central axis L1 of the linear accelerator 22 with the second axis L3 of the hospital bed 23 can refer to the alignment process of the central axis of the computed tomography scanner 21 with the central axis L1 of the linear accelerator 22 described in this embodiment. Specifically, the alignment method of the medical devices includes:

[0082] First, the laser 11 is mounted at the center of the linear accelerator 22, and the beam emitted by the laser 11 propagates along the central axis L1 of the linear accelerator 22 and passes through the working area of ​​the hospital bed 23. Then, the detector 12 is mounted on the hospital bed 23, located on the first axis L2 of the hospital bed 23. The position of the laser 11 is calibrated using the same method described above. Next, the perforated plate 13 is mounted on the hospital bed 23, located on the first axis L2 of the hospital bed 23. The perforated plate 13 is positioned between the hospital bed 23 and the linear accelerator 22, so the beam diffracts through the holes in the perforated plate 13, and the detector 12 acquires the diffracted spot 123. Finally, the deflection angle, pitch angle, and displacement of the hospital bed 23 relative to the linear accelerator 22 are obtained based on the diffracted spot 123. The position of the hospital bed 23 is adjusted accordingly so that the deviation between the second axis L3 of the hospital bed 23 and the central axis of the linear accelerator 22 is within a set range.

[0083] Wherein, the first axis L2 is the central axis of the surface of the bed 23; the second axis L3 is the central axis of the working area of ​​the bed 23, and is parallel to the first axis L2. It should be noted that the bed 23 is used to carry the object to be tested into the working area of ​​the linear accelerator 22 and / or the computed tomography scanner 21. The object to be tested is located above the bed 23, and the portion above the bed 23 constitutes its working area. Therefore, the working area on the bed 23 needs to be coaxially aligned with the working area of ​​the linear accelerator 22 and / or the computed tomography scanner 21. The coaxial requirement between the bed 23 and the linear accelerator 22 and / or the computed tomography scanner 21 is that the central axis L3 of the working area of ​​the bed 23 is aligned with the central axis of the linear accelerator 22 and / or the computed tomography scanner 21.

[0084] Furthermore, during the adjustment of the position of the hospital bed 23, the computed tomography scanner 21 can also be used as a second medical device. Also, during the adjustment of the coaxiality of the computed tomography scanner 21, the linear accelerator 22, and the hospital bed 23, the computed tomography scanner 21 and the linear accelerator 22 can be aligned first, and then aligned with the hospital bed 23; alternatively, the hospital bed 23 and the linear accelerator 22 can be aligned first, and then aligned with the computed tomography scanner 21; or, the hospital bed 23 and the computed tomography scanner 21 can be aligned first, and then aligned with the linear accelerator 22; this embodiment does not specifically limit this.

[0085] In summary, this embodiment, through the cooperation of the laser 11, the detector 12, and the aperture plate 13, uses the acquired diffraction spot 123 as the optical signal for alignment adjustment. This enables the alignment of the central axis of the computed tomography scanner 21 with the central axis L1 of the linear accelerator 22 and the second axis L3 of the hospital bed 23, achieving high alignment accuracy. Furthermore, the alignment method for medical equipment provided in this embodiment can overcome the limitations of precision caused by mechanical tooling structures.

[0086] <Example 2>

[0087] Based on the same inventive concept, this embodiment provides an alignment method for medical devices. For details not covered in this embodiment, please refer to the relevant description in Embodiment 1. For ease of explanation, this embodiment uses a linear accelerator as the first medical device and a computed tomography scanner as the second medical device to specifically illustrate the alignment method for the medical devices provided in this embodiment.

[0088] Please see Figure 1 and Figures 8-11 The alignment method for the medical device includes:

[0089] Step 1 S10: Install the laser 11 using mechanical tooling so that the beam emitted by the laser 11 passes through the working areas of the first medical device and the second medical device.

[0090] Furthermore, the laser 11 is mounted at the center of the computed tomography scanner 21, and the beam propagates along the central axis L4 of the computed tomography scanner 21. The central axis L4 of the computed tomography scanner 21 is the axis of rotation of the computed tomography scanner 21. After the laser 11 is mounted, a detector 12 is installed on the side of the linear accelerator 22 away from the computed tomography scanner 21 so that the detector 12 can receive the beam.

[0091] Similarly, due to the limited precision of machining, the position of the laser 11 needs to be calibrated. Therefore, the same calibration method as in Embodiment 1 is used to calibrate the laser 11, so that the first spot motion trajectory 121 formed by the laser 11 on the detector 12 converges to the first fixed point 122.

[0092] Step 2 S20: The optical element is installed in the first medical device and / or the second medical device using the mechanical tooling, so that the light beam passes through the optical element to form an optical signal.

[0093] In this embodiment, the optical element is an optical lens 14. The optical lens 14 is used to refract and converge the light beam passing through it. Therefore, the optical lens 14 includes, but is not limited to, a converging lens or a focusing diffraction device. Further, a mechanical tooling structure is used to install the optical lens 14 at the center of the linear accelerator 22. The light beam is refracted by the optical lens 14 and forms a refracted spot on the detector 12. Then, the linear accelerator 22 is rotated, causing the optical lens 14 to rotate as well, forming a second light spot motion trajectory 124 on the detector 12. Similarly, due to the deviation between the central axis L4 of the computed tomography scanner 21 and the central axis L1 of the linear accelerator, the second light spot motion trajectory 124 also forms a ring-shaped aperture. Finally, the optical adjustment seat corresponding to the optical lens 14 is adjusted so that the second light spot motion trajectory 124 gradually converges to a second fixed point 125. It can be understood that, as Figure 11 As shown, the line connecting the center point of the laser 11 and the first fixed point 122 is the central axis L4 of the computed tomography scanner 21, and the line connecting the center point of the laser 11 and the second fixed point 125 is the central axis L1 of the linear accelerator 22.

[0094] Therefore, by obtaining the position coordinates of the first fixed point 122, the second fixed point 125, and the laser 11, the function expression of the central axis L4 of the computed tomography scanner 21 and the function expression of the central axis L1 of the linear accelerator 22 in the coordinate system can be obtained. The optical signal includes the position coordinates of the first fixed point 122 and the second fixed point 125.

[0095] Step 3 S30: Adjust the position of the first medical device or the second medical device according to the light signal until the deviation of the central axis of the first medical device and the second medical device is within the set range.

[0096] Based on the function expression of the central axis L4 of the computed tomography scanner 21 and the function expression of the central axis L1 of the linear accelerator 22 in the coordinate system, the angle between the two central axes can be obtained. Based on this, the deflection angle, pitch angle, and displacement of the computed tomography scanner 21 or the linear accelerator 22 can be obtained. And based on the deflection angle, pitch angle, and displacement, the position of the computed tomography scanner 21 or the linear accelerator 22 is adjusted until the deviation between the central axis L4 of the computed tomography scanner 21 and the central axis L1 of the linear accelerator 22 is within a set range.

[0097] In summary, compared to Embodiment 1, this embodiment uses an optical lens 14 as the optical element. Through the refraction and focusing of the light beam by the optical lens 14 and the rotation of the linear accelerator 22, a second light spot trajectory 124 can be formed on the detector 12, and then the second fixed point 125 can be obtained. Based on the first fixed point 122 and the second fixed point 125, the relationship between the central axis L4 of the computed tomography scanner 21 and the central axis L1 of the linear accelerator 22 can be accurately determined. Based on this, adjusting the position of the computed tomography scanner 21 or the linear accelerator 22 can achieve coaxiality between the two, resulting in high alignment accuracy.

[0098] <Example 3>

[0099] Based on the same inventive concept, this embodiment provides an alignment method for medical devices. For details not covered in this embodiment, please refer to the relevant descriptions in Embodiments 1 and 2. For ease of explanation, this embodiment uses a computed tomography scanner as the first medical device and a linear accelerator as the second medical device to specifically illustrate the alignment method for the medical devices provided in this embodiment.

[0100] Please see Figure 1 and Figures 12-15 The alignment method for the medical device includes:

[0101] Step 1 S10: Install the laser 11 using mechanical tooling so that the beam emitted by the laser 11 passes through the working areas of the first medical device and the second medical device.

[0102] like Figure 12As shown, the laser 11 is mounted on the side of the first medical device away from the second medical device; of course, the laser 11 can also be mounted on the side of the second medical device away from the first medical device, and this embodiment does not specifically limit this. For example, a mechanical tooling structure is used to mount the laser 11 on the side of the computed tomography scanner 21 away from the linear accelerator 22. Since both the computed tomography scanner 21 and the linear accelerator 22 are annular in shape and their internal cavities are interconnected, the beam emitted by the laser 11 can sequentially pass through the internal cavities of the computed tomography scanner 21 and the linear accelerator 22 and exit.

[0103] Step 2 S20: The optical element is installed in the first medical device and / or the second medical device using the mechanical tooling, so that the light beam passes through the optical element to form an optical signal.

[0104] In this embodiment, the optical element is a plurality of reflectors 15. The plurality of reflectors 15 are spaced apart and mounted on the cavity walls of the computed tomography scanner 21 and the linear accelerator 22, and are alternately distributed on opposite sides of the central longitudinal section 211 of the computed tomography scanner 21 and the central longitudinal section 221 of the linear accelerator 22 along their respective axial directions. See also... Figure 12 and Figure 13The central longitudinal section of the computed tomography scanner 21 refers to the section cut along the X-axis direction at the midpoint of the Y-axis direction of the computed tomography scanner 21. Similarly, the central longitudinal section of the linear accelerator 22 refers to the section cut along the X-axis direction at the midpoint of the Y-axis direction of the linear accelerator 22. The axially opposite sides of the central longitudinal section 211 of the computed tomography scanner 21 and the central longitudinal section 221 of the linear accelerator 22 refer to the opposite sides extending in the X-direction of the two sections. Therefore, the alternating arrangement of the plurality of reflectors 15 means that one reflector 15 is located on one side of the section, and the adjacent reflector 15 is located on the opposite side of the section, and so on for the remaining reflectors 15. At least two of the plurality of reflectors 15 are respectively located on the radial plane where the center of the working area of ​​the first medical device and the second medical device is located. For example, a reflector 15 is disposed on the radial plane of the center of the computed tomography scanner 21; a reflector 15 is disposed on the radial plane of the center of the linear accelerator 22. It can be seen that the purpose of arranging multiple reflectors 15 is to ensure that the light beam is reflected sequentially from the computed tomography scanner 21 and the linear accelerator 22 by each reflector 15 in turn. For this purpose, the axial distance d between adjacent reflectors 15 must be equal. Thus, the light beam enters from one side of the computed tomography scanner 21 to the first reflector 15, is reflected sequentially from the computed tomography scanner 21, enters the first reflector 15 within the linear accelerator 22, and is finally reflected sequentially from the linear accelerator 22. This embodiment does not limit the specific number of reflectors 15.

[0105] Please see Figure 14 Each of the reflectors 15 has a scale mark 151, which marks the dimension along the central axis of the first medical device or the dimension along the central axis of the second medical device. In other words, the scale mark 151 extends along the X-axis to determine the position of the light beam in the X-direction when it is incident on the reflector 15. Furthermore, to ensure that the light beam can be incident on the linear accelerator 22 and exit from the other side of the linear accelerator 22, and for ease of reading, the position of the laser 11 needs to be adjusted so that the light beam is incident on the scale origin O of the reflector 15 adjacent to the laser 11. That is, in the X-direction, the light beam exiting from the laser 11 is incident on the origin O of the first reflector 15 of the computed tomography scanner 21. Preferably, the origin O is located at the center point of the reflector 15 in the X-direction.

[0106] After all the reflectors 15 and the laser 11 are in place, the beam emitted by the laser 11 will be reflected sequentially by each reflector 15 and finally exit from one side of the linear accelerator 22. Optionally, each reflector 15 is also equipped with a reader for automatically reading the scale corresponding to the beam passing through the reflector 15. Of course, the scale of each reflector 15 can also be read manually. The optical signal includes the scale of the beam incident on each reflector 15.

[0107] Step 3 S30: Adjust the position of the first medical device or the second medical device according to the light signal until the deviation of the central axis of the first medical device and the second medical device is within the set range.

[0108] Please see Figure 15 Since the reflectors 15 are all positioned on the central longitudinal sections of the corresponding computed tomography scanner 21 and the corresponding linear accelerator 22, the optical path within the computed tomography scanner 21 is symmetrical with respect to its central axis L4, and the optical path within the linear accelerator 22 is also symmetrical with respect to its central axis L1. It is understood that the incident angle α1 of the beam in the computed tomography scanner 21 is equal to the exit angle α2, and the incident angle β1 of the beam in the linear accelerator 22 is equal to the exit angle β2. Furthermore, since the length between the origins O of each reflector 15 in the X direction is known, the specific values ​​of α1, α2, β1, and β2 can be easily calculated based on the scale. Further, based on the geometric relationship between the incident and exit beams, the angle between the central axis L4 of the computed tomography scanner 21 and the central axis L1 of the linear accelerator 22 can be calculated to be equal to (α1-β1). Therefore, based on the angle between the central axis L4 of the computed tomography scanner 21 and the central axis L1 of the linear accelerator 22, the deflection angle, pitch angle, and displacement of the computed tomography scanner 21 relative to the linear accelerator 22 can be further calculated. The position of the computed tomography scanner 21 can then be adjusted accordingly until the deviation between the central axis L4 of the computed tomography scanner 21 and the linear accelerator L2 is within a set range. Alternatively, the deflection angle, pitch angle, and displacement of the linear accelerator 22 relative to the computed tomography scanner 21 can be obtained, and the position of the linear accelerator 22 can be adjusted accordingly.

[0109] In summary, the alignment method for the medical device provided in this embodiment only requires multiple reflectors 15 to obtain the angle between the central axis L4 of the computed tomography scanner 21 and the central axis L1 of the linear accelerator 22, and thereby achieves coaxial adjustment of the two, resulting in high alignment accuracy. Compared with Embodiments 1 and 2, this embodiment does not require the use of a detector to obtain a light spot image, simplifying the alignment process and making it easier to operate.

[0110] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to mutually. In addition, different parts between embodiments can also be combined with each other, and this invention does not limit this.

[0111] Furthermore, it should be understood that although the present invention has been disclosed above with reference to preferred embodiments, these embodiments are not intended to limit the present invention. For any person skilled in the art, many possible variations and modifications can be made to the technical solutions of the present invention based on the disclosed technical content, or equivalent embodiments can be modified accordingly, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the scope of protection of the present invention.

Claims

1. A method for aligning a medical device, characterized in that, include: The laser (11) is installed using mechanical tooling so that the beam emitted by the laser (11) passes through the working areas of the first medical device and the second medical device; The aforementioned mechanical tooling is used to install optical elements within the first medical device and / or the second medical device, so that the light beam passes through the optical elements to form an optical signal; Based on the light signal, adjust the position of the first medical device or the second medical device until the deviation of the central axis of the first medical device and the second medical device is within a set range; The optical element includes an aperture plate (13), and the optical signal includes a diffraction spot (123) formed by the light beam through the aperture plate (13); or, the optical element includes an optical lens (14), and the optical signal includes the position coordinates of a first fixed point (122) and a second fixed point (125); and before installing the aperture plate (13) or the optical lens (14), the second medical device is rotated, and the laser (11) is rotated, so that the light beam forms a first spot motion trajectory (121); the position of the laser (11) is adjusted so that the first spot motion trajectory (121) converges to the first fixed point (122); and after installing the optical lens (14), the first medical device is rotated, and the optical lens (14) is rotated so that the light beam forms a second spot motion trajectory (124); the position of the optical lens (14) is adjusted so that the second spot motion trajectory (124) converges to the second fixed point (125). Alternatively, the optical element may include a plurality of mirrors (15) having scale markings (151); and the first medical device and the second medical device may be arranged in a linear direction, with the scale markings (151) extending along the linear direction; the optical signal may include the scale on each of the mirrors (15) indicating the incidence of the light beam.

2. The alignment method for medical equipment according to claim 1, characterized in that, The optical element is the aperture plate (13) or the optical lens (14); the aperture plate (13) or the optical lens (14) is mounted on the first medical device and is located on the central axis of the first medical device.

3. The alignment method for medical equipment according to claim 2, characterized in that, Before installing the perforated plate (13) or the optical lens (14), the alignment method of the medical device includes: The laser (11) is installed at the center of the second medical device using the aforementioned mechanical tooling. The detector (12) is mounted on the first medical device or on one side of the first medical device using the mechanical tooling, so that the detector (12) can receive the light beam; The second medical device is rotated, and the laser (11) is rotated so that the light beam forms the first spot motion trajectory (121) on the detector (12). According to the first light spot motion trajectory (121), adjust the position of the laser (11) until the first light spot motion trajectory (121) obtained by the detector (12) converges to the first fixed point (122).

4. The alignment method for medical equipment according to claim 3, characterized in that, After installing the perforated plate (13), the alignment method of the medical device includes: The light beam is diffracted through the aperture plate (13) and forms the diffracted spot (123) on the detector (12). According to the diffraction spot (123), adjust the position of the first medical device or the second medical device until the deviation of the central axis of the first medical device and the second medical device is within the set range.

5. The alignment method for medical equipment according to claim 4, characterized in that, The process of adjusting the position of the first medical device or the second medical device according to the diffraction spot (123) until the deviation of the central axis of the first medical device and the second medical device is within a set range includes: The shape of the obtained diffraction spot (123) is compared with the pre-calibrated spot shape to determine the deflection angle, pitch angle and displacement of the first medical device or the second medical device; Based on the deflection angle, the pitch angle, and the displacement, adjust the position of the first medical device or the second medical device until the deviation of the central axis of the first medical device and the second medical device is within a set range.

6. The alignment method for medical equipment according to claim 4, characterized in that, The process of adjusting the position of the first medical device or the second medical device according to the diffraction spot (123) until the deviation of the central axis of the first medical device and the second medical device is within a set range includes: Determine whether the light intensity of the diffraction spot (123) is at its maximum value. If not, adjust the position of the first medical device or the second medical device until the light intensity of the diffraction spot (123) reaches its maximum value. Determine whether the shape of the diffraction spot (123) is circular. If not, adjust the position of the first medical device or the second medical device until the shape of the diffraction spot (123) is circular.

7. The alignment method for medical equipment according to claim 3, characterized in that, After installing the optical lens (14), the alignment method of the medical device includes: The light beam is refracted by the optical lens (14) and forms a refracted spot on the detector (12); The first medical device is rotated, and the optical lens (14) is rotated to form the second light spot motion trajectory (124) on the detector (12). According to the second light spot motion trajectory (124), adjust the position of the optical lens (14) until the second light spot motion trajectory (124) acquired by the detector (12) converges to the second fixed point (125). At least the position coordinates of the first fixed point (122) and the second fixed point (125) are obtained, and the deflection angle, pitch angle and displacement of the first medical device or the second medical device are determined according to the position coordinates; Based on the deflection angle, the pitch angle, and the displacement, adjust the position of the first medical device or the second medical device until the deviation of the central axis of the first medical device and the second medical device is within a set range.

8. The alignment method for medical equipment according to claim 1, characterized in that, The optical element is a plurality of the reflectors (15); and both the first medical device and the second medical device have an inner cavity as the corresponding working area; the plurality of reflectors (15) are spaced apart on the cavity walls of the first medical device and the second medical device so that the light beam is reflected sequentially by the reflectors (15) and passes through the working areas of the first medical device and the second medical device; wherein at least two of the plurality of reflectors (15) are respectively disposed on the radial plane at the center position of the working area of ​​the first medical device and the second medical device.

9. The alignment method for medical equipment according to claim 8, characterized in that, The scale mark (151) marks the dimension in the direction of the central axis of the first medical device, or the dimension in the direction of the central axis of the second medical device.

10. The alignment method for medical equipment according to claim 9, characterized in that, The alignment method for the medical device includes: The laser (11) is installed on the side of the first medical device away from the second medical device, or on the side of the second medical device away from the first medical device, using the mechanical tooling described above. The mechanical tooling is used to install multiple mirrors (15) onto the cavity walls of the first medical device and the second medical device; The position of the laser (11) is adjusted so that the beam is reflected sequentially by all the reflectors (15) and passes through the working areas of the first medical device and the second medical device; Read the scale of the incident beam on the reflector (15), and calculate the deflection angle, pitch angle and displacement of the first medical device or the second medical device based on the read scale. Based on the deflection angle, the pitch angle, and the displacement, adjust the position of the first medical device or the second medical device until the deviation of the central axis of the first medical device and the second medical device is within a set range.

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