Biplane radiotherapy laser positioning device and method

Abstract

The invention discloses a biplane laser positioning method, which comprises the following steps that: a biplane laser positioning device of CT (Computed Tomography) scanning equipment respectively forms double cross-shaped laser lines on the left side and the right side of a patient, and forms #-shaped laser lines on the chest and abdomen of the patient; making a marking line on the body surface of the patient according to a CT scanning positioning result; the linear accelerator is provided with a double-plane laser positioning device which is the same as the CT scanning device, and positioning can be completed by enabling a laser ray formed on the body surface of the patient by the double-plane laser positioning device of the linear accelerator to coincide with a marking line made on the body surface of the patient; and performing treatment. A double-plane laser positioning method is adopted, laser lines and marking lines are increased by nearly one time on the body surface of a patient, translation errors in the left-right direction, the belly, the back, the head and the foot direction can be reduced, errors of head and foot rotation and left-right rotation of the patient can be further controlled, and the positioning precision of the patient is improved in a multiplied mode.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and more specifically, to a dual-plane radiotherapy laser positioning device and method. Background Art

[0002] At present, the external laser positioning / positioning system of radiotherapy equipment is generally composed of three groups of laser lights, which are respectively installed on the left and right walls and ceiling of CT, accelerator and other equipment. The three groups of laser lines emitted by the three groups of laser lights construct three laser beam planes in space: horizontal plane, cross-section and sagittal plane, and establish a three-dimensional spatial radiotherapy coordinate system.

[0003] With the patient in the supine position as a reference, the sagittal plane of the treatment coordinate system is constructed by the vertical laser lines emitted by the laser lamp on the ceiling; the coronal plane is constructed by the horizontal laser lines emitted by the laser lamps on the left and right sides, and the horizontal laser lines on the left and right sides coincide with each other; the transverse plane is constructed by the vertical laser lines emitted by the laser lamps on the left and right sides, and the vertical laser lines on the left and right sides coincide with each other; the sagittal plane, coronal plane, and transverse plane are all perpendicular to each other.

[0004] Due to the needs of treatment positioning and placement, the vertical laser line on the sagittal plane of the radiotherapy CT simulation positioning equipment can be moved left and right; the horizontal laser lines on the left and right sides of the coronal plane can be moved in the ventral-dorsal direction; and the vertical laser lines on the left and right sides of the transverse plane can be moved in the head-to-feet direction.

[0005] Three groups of laser lines converge on the patient's body and appear as a "cross" laser line on the left, a "cross" laser line on the right, and a "cross" laser line in the middle of the body. The left and right "cross" laser planes completely overlap to locate the patient's head and feet and abdomen and back directions. The top laser plane is perpendicular to the left and right laser planes to determine the patient's left and right positions. The left and right "cross" laser lines can be used to mark the patient's head and feet, abdomen and back directions, and then the tumor's entry and exit direction and the spatial position of the treatment bed height can be controlled; the top "cross" laser line can be used to determine the patient's left and right positions and thus determine the tumor's left and right spatial positions. Although the existing laser positioning method is simple and easy to use, it has a low positioning accuracy because it is a single plane in the abdomen and back directions, head and feet directions, and left and right directions. It cannot effectively avoid the problem of trunk rotation and cannot better determine the patient's position. Summary of the invention

[0006] The present invention aims to overcome the deficiencies of the above-mentioned prior art and provide a dual-plane radiotherapy laser positioning device and method, which are used to solve the problems that the existing laser positioning devices and methods have low positioning accuracy, cannot effectively avoid trunk rotation, and cannot better determine the patient's position.

[0007] The technical solution adopted by the present invention is a dual-plane radiotherapy laser positioning method, comprising the following steps:

[0008] S1. CT scanning positioning. The CT scanning equipment includes a laser positioning system. The laser positioning system includes a left laser surface, a right laser surface and a top laser surface. The left laser surface and the right laser surface are respectively provided with one parallel and two perpendicular fan-shaped laser lines, forming double "cross" laser lines on the left and right sides of the patient. The top laser surface is provided with two fan-shaped laser lines that are respectively perpendicular to the vertical laser lines in the left laser surface and the right laser surface, and together with the two perpendicular laser lines in the left laser surface and the right laser surface, form a "well"-shaped laser line on the chest and abdomen of the patient;

[0009] S2. Draw marking lines on the patient's body surface according to the results of CT scanning positioning;

[0010] S3, Positioning: The linear accelerator includes the same laser positioning system as that on the CT machine. Adjust the patient's position on the linear accelerator so that the marking line on the body surface is aligned with the laser positioning line of the linear accelerator;

[0011] S4. Implement treatment.

[0012] The laser positioning system on the CT scanning device forms a double "cross" laser line on both sides of the patient and a "well" laser line on the patient's chest and abdomen. The doctor makes corresponding marking lines on the patient's body surface according to the CT scanning results. The linear accelerator is equipped with the same laser positioning system as the CT scanning device. The laser lines emitted by the laser positioning system on the linear accelerator are made to coincide with the marking lines on the patient's body surface, so that the patient's position during radiotherapy can be controlled.

[0013] Both CT scanning equipment and linear accelerators use a dual-plane laser positioning system, which can better control the patient's positioning error during radiotherapy. The dual-plane laser positioning method, which has nearly double the number of laser lines and marking lines on the patient's body surface, can not only reduce the translation error in the left and right, abdomen and back, and head and feet directions, but also further control the patient's head and feet rotation and left and right rotation errors, which will double the patient's positioning accuracy.

[0014] Further, in step S1, the parallel laser lines and the two perpendicular laser lines on the left laser surface overlap with the parallel laser lines and the two perpendicular laser lines on the right laser surface, respectively.

[0015] When the parallel laser lines on the left laser surface coincide with the parallel laser lines on the right laser surface, a single parallel laser line will be formed, which can be used to locate the height of the tumor in the patient's anterior-posterior direction. If the parallel laser lines on the left laser surface do not coincide with the parallel laser lines on the right laser surface, two horizontal laser lines at different heights will be formed, which is not conducive to locating the height of the tumor in the patient's anterior-posterior direction. When the two vertical laser lines on the left laser surface coincide with the two vertical laser lines on the right laser surface, two vertical laser lines will be formed, and these two vertical laser lines can be used to locate the position of the tumor in the patient's head-feet direction. If the two vertical laser lines on the left laser surface do not coincide with the two vertical laser lines on the right laser surface, four vertical laser lines will appear in the patient's head-feet direction, and the positioning range in the patient's head-feet direction will increase, which is not conducive to tumor positioning.

[0016] Further, the marking lines made in step S2 include two double "plus" sign marking lines on the left and right sides, and a "grid" sign marking line on the patient's chest and abdomen.

[0017] The laser positioning system of the CT scanning device forms double "plus" sign laser lines on both sides of the patient, and a "grid" sign laser line on the chest and abdomen. The laser positioning system on the linear accelerator is the same as that of the CT scanning device, and it will also form double "plus" sign laser lines on both sides of the patient, and a "grid" sign laser line on the chest and abdomen. Making double "plus" sign marking lines on the left and right sides of the patient, and a "grid" sign marking line on the chest and abdomen, and making them consistent with the laser lines emitted by the laser positioning systems on the CT scanning device and the linear accelerator can quickly and accurately control the patient's positioning.

[0018] Further, the positioning in step S3 includes the following steps:

[0019] S31. Adjust the vertical height of the left laser surface and the right laser surface so that the parallel laser lines coincide with the horizontal lines of the double "plus" sign marking lines on the left and right sides of the patient;

[0020] S32. Adjust the horizontal direction of the left laser surface and the right laser surface so that the two vertical laser lines respectively coincide with the two vertical lines of the double "plus" sign marking lines on the left and right sides of the patient;

[0021] S33. Adjust the horizontal direction of the top laser surface so that the two laser lines respectively coincide with the two vertical lines of the "grid" sign marking line.

[0022] The left laser surface and the right laser surface of the linear accelerator coincide with the double "cross" marking lines on the left and right sides of the patient, respectively, so as to locate the height of the left and right sides of the patient, as well as the tilt angle of the head and feet. Taking the left side as an example, the horizontal laser line of the left laser surface of the linear accelerator coincides with the horizontal line of the double "cross" marking line on the left side of the patient, so as to locate the vertical height of the left side of the patient. The two vertical laser lines of the left laser surface of the linear accelerator coincide with the two vertical lines of the double "cross" marking line on the left side of the patient, so as to locate the tilt angle of the head and feet of the patient. In the existing laser positioning system, the left laser surface and the marking line on the left side of the patient are both single "cross". When the left laser surface of the linear accelerator coincides with the "cross" marking line on the left side of the patient, the patient's head and feet direction on the linear accelerator may be tilted relative to the head and feet direction on the CT machine, and the dual-plane laser positioning method can prevent this situation from happening. If the patient's head and feet are tilted on the linear accelerator relative to the head and feet on the CT machine, only one of the two vertical laser lines on the left laser surface coincides with the vertical line of the double "cross" line on the patient's left side. The two laser lines on the top laser surface coincide with the two vertical lines of the "well" shaped marking line, respectively, which can control the patient's left-right rotation, that is, the height of the patient's left side relative to the patient's right side.

[0023] Furthermore, different colors are used between two laser lines perpendicular to the ground in the left laser plane and the right laser plane in the laser positioning system, and between two laser lines in the top laser plane.

[0024] Using different colors between the two laser lines perpendicular to the ground in the left laser plane and the right laser plane, and between the two laser lines in the top laser plane can facilitate distinction and alignment to prevent confusion.

[0025] Furthermore, the present invention also provides a dual-plane radiotherapy laser positioning device, including a left-side laser emitter, a right-side laser emitter and a top laser emitter, the left-side laser emitter and the right-side laser emitter respectively emit one parallel and two vertical fan-shaped laser lines; the top laser emitter emits two fan-shaped laser lines that are perpendicular to the vertical laser lines emitted by the left-side laser emitter and the right-side laser emitter.

[0026] The dual-plane laser positioning device is installed in the CT room and radiotherapy room. It forms double "cross" and "well" shaped laser lines on both sides and the chest and abdomen of the patient respectively. Compared with the traditional single "cross" shaped laser line formed on both sides and the chest and abdomen of the patient, it has an additional set of reference lines in the direction of the patient's head and feet, and in the left and right directions, forming two planes, which can better suppress the rotation of the trunk and improve the accuracy of radiotherapy positioning.

[0027] Furthermore, the left laser emitter and the right laser emitter respectively include a main laser emitter and a sub-laser emitter, the main laser emitter emits a parallel and a vertical laser line, the sub-laser emitter emits a vertical laser line, and the distance between the main laser emitter and the sub-laser emitter can be adjusted.

[0028] The size of the tumor in the head and feet direction of different patients is different. The distance between the main laser emitter and the auxiliary laser emitter can be adjusted to suit different patients. When the length of the tumor in the head and feet direction of the patient is large, increasing the distance between the main laser emitter and the auxiliary laser emitter can improve the positioning accuracy.

[0029] Furthermore, the switches of the main laser transmitter and the sub-laser transmitter can be controlled individually.

[0030] For patients whose tilt angle in the head-to-feet direction is easier to control, or when the length of the tumor in the head-to-feet direction is smaller, only the main laser transmitter can be used as needed to reduce interference from the auxiliary laser transmitter.

[0031] Furthermore, the two laser beams at the top are emitted by two different laser emitters, and the distance between the two laser emitters can be adjusted.

[0032] The size of the tumor in the left-right direction of different patients is different, and the distance between the two laser emitters on the top can be adjusted to suit different patients. When the length of the tumor in the left-right direction of the patient is large, increasing the distance between the two laser emitters can improve accuracy.

[0033] Furthermore, the switches of the top two laser emitters can be controlled individually.

[0034] When the height of the left and right sides of the patient is easier to control, or the length of the tumor in the left and right directions of the patient is smaller, only one of the laser transmitters can be turned on as needed to reduce interference from the other laser transmitter.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows: the dual-plane radiotherapy laser positioning device is applied to CT scanning equipment and linear accelerators, which forms a double "cross" shaped laser line on both sides of the patient and a "well" shaped laser line on the chest and abdomen of the patient. The dual-plane laser positioning system forms a three-dimensional space covering the tumor target area, effectively solving the problem that a single plane cannot suppress the rotation of the trunk. The dual-plane laser positioning method is adopted, and an additional set of reference lines is provided in the head and foot direction and the left and right direction of the patient, which can not only reduce the translation error in the left and right, abdomen and back, and head and foot directions, but also control the error of the patient's head and foot rotation and left and right rotation, which will double the patient's positioning accuracy. Different colors are used between the two vertical laser lines in the left laser plane and the right laser plane, and between the two laser lines on the top laser plane, respectively, to facilitate distinction and alignment and prevent confusion. The distance between the main laser emitter and the auxiliary laser emitter, and between the two laser emitters at the top can be adjusted to make it suitable for different patients and improve accuracy. The main laser emitter, the auxiliary laser emitter, and the two laser emitters on the top are each equipped with independent control switches, which can be adjusted according to the patient's specific situation for easy use. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural diagram of the dual-plane radiotherapy laser positioning device of the present invention.

[0037] Figure 2 It is a top view of the dual-plane radiotherapy laser positioning device of the present invention.

[0038] Figure 3 This is a structural diagram of the laser positioning device of the existing CT scanning equipment forming a "cross" shaped laser line on the patient's chest and abdomen.

[0039] Figure 4 The laser positioning device of the existing CT scanning equipment forms a structural diagram of a "cross" shaped laser line on the left side and chest and abdomen of the patient.

[0040] Figure 5 This is a structural diagram of the existing laser positioning device of the linear accelerator forming a "cross" shaped laser line on the patient's chest and abdomen.

[0041] Figure 6 The existing laser positioning device of the linear accelerator forms a structural diagram of a "cross" shaped laser line on the left side and chest and abdomen of the patient.

[0042] Figure 7 This is a step diagram of the dual-plane radiotherapy laser positioning method of the present invention.

[0043] Figure 8 A diagram showing the structure of the dual-plane radiotherapy laser positioning device of the CT scanning equipment forming laser lines on the patient's left side and chest and abdomen.

[0044] Fig. 9 This is a diagram of the positioning steps in the dual-plane radiotherapy laser positioning method of the present invention.

[0045] Fig.10 This is a comparison diagram of the laser line formed on the left side of the patient by the dual-plane radiotherapy laser positioning device of the linear accelerator and the marking line made on the left side of the patient.

[0046] Fig.11 This is a comparison chart of the laser line formed on the patient's chest and abdomen by the dual-plane radiotherapy laser positioning device of the linear accelerator and the marking line made on the patient's chest and abdomen. DETAILED DESCRIPTION

[0047] The drawings of the present invention are only for illustrative purposes and should not be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted. Example 1

[0048] like Figure 1 , Figure 2 As shown, this embodiment provides a dual-plane radiotherapy laser positioning device, including a left laser emitter 1, a right laser emitter 2 and a top laser emitter 3, which are respectively installed on the left and right side walls and ceilings of equipment such as CT and linear accelerators. With the patient in a supine position as a reference, the left laser emitter 1 and the right laser emitter 2 can both move in the direction of the patient's head and feet and the abdomen and back, and the top laser emitter 3 can move in the left and right direction of the patient.

[0049] The left laser emitter 1 and the right laser emitter 2 emit one parallel and two perpendicular fan-shaped laser lines respectively; the top laser emitter 3 emits two fan-shaped laser lines perpendicular to the perpendicular laser lines emitted by the left laser emitter and the right laser emitter.

[0050] Specifically, the left laser emitter 1 includes a first main laser emitter 11 and a first auxiliary laser emitter 12, and the right laser emitter 2 includes a second main laser emitter 21 and a second auxiliary laser emitter 22. The first main laser emitter 11 and the second main laser emitter 21 respectively emit a parallel fan-shaped laser line and a vertical fan-shaped laser line, and the first auxiliary laser emitter 12 and the second auxiliary laser emitter 22 emit a vertical fan-shaped laser line. The fan-shaped laser lines emitted by the first main laser emitter 11 and the first auxiliary laser emitter 12 form a double "cross" shaped laser line on the left side of the patient, and the fan-shaped laser lines emitted by the second main laser emitter 21 and the second auxiliary laser emitter 22 form a double "cross" shaped laser line on the right side of the patient, and the vertical laser line emitted by the first main laser emitter 11 and the vertical laser line emitted by the first auxiliary laser emitter 12 use different colors, and the vertical laser line emitted by the second main laser emitter 21 and the vertical laser line emitted by the second auxiliary laser emitter 22 use different colors, so as to facilitate distinction. The first auxiliary laser emitter 12 and the second auxiliary laser emitter 22 are respectively provided with horizontal guide rails, so that the horizontal distances between the first main laser emitter 11 and the second main laser emitter 21 can be adjusted.

[0051] The top laser emitter 3 includes a first laser emitter 31 and a second laser emitter 32. The first laser emitter 31 and the second laser emitter 32 respectively emit a fan-shaped laser line perpendicular to the vertical laser lines emitted by the first main laser emitter 11, the second main laser emitter 21, the first auxiliary laser emitter 12 and the second auxiliary laser emitter 22, and the laser line emitted by the first laser emitter 31 is different in color from the laser line emitted by the second laser emitter 32. A guide rail is provided between the first laser emitter 31 and the second laser emitter 32 so that the distance between the two can be adjusted. Example 2

[0052] The existing laser positioning method is as follows: the laser positioning system of the CT scanning device forms a "cross" laser line on both sides of the patient and the chest and abdomen; according to the results of the CT scanning positioning, a "cross" marking line is made on the left and right sides and the chest and abdomen of the patient; the "cross" laser line formed by the laser positioning system of the linear accelerator on both sides of the patient and the chest and abdomen coincides with the "cross" marking line on the left and right sides and the chest and abdomen of the patient. However, since the human body is flexible, any part may tilt or rotate. For example, when the patient's "cross" marking line and the part above it do not tilt or rotate, but the part below the "cross" marking line tilts or rotates, the laser line emitted by the laser positioning system of the linear accelerator can still coincide with the marking line made on the patient's body surface, but in fact the patient's body position on the linear accelerator and the body position on the CT scanning device have changed. If the tilted or rotated part is close to the tumor, it may cause the tumor in the patient's body to shift, thereby affecting the treatment effect or accidentally injuring the patient's normal tissue.

[0053] like Figure 3 , Figure 4 As shown, the laser positioning system of the CT scanning device forms a "cross" laser line on the left side, right side, chest and abdomen of the patient. The marking line made on the left side of the patient is consistent with the "cross" laser line formed by the laser positioning system on the left side, right side, chest and abdomen of the patient.

[0054] like Figure 5 As shown, the "cross" shaped laser lines formed by the laser positioning system of the linear accelerator on the left side, right side, chest and abdomen of the patient coincide with the "cross" shaped marking lines made on the left side, right side, chest and abdomen of the patient. However, the patient's body position at this time has changed compared to the position on the CT scanning device, and his abdomen has tilted in the direction of the head and feet.

[0055] like Figure 6 As shown, the "cross" shaped laser line formed by the laser positioning system of the linear accelerator on the patient's chest and abdomen coincides with the "cross" shaped marking line on the patient's chest and abdomen. However, the patient's body position at this time has changed compared to the position on the CT scanning device, and his abdomen has rotated in the left and right directions.

[0056] It can be seen that the existing laser positioning method cannot control the inclination of the patient's head and feet and the left-right rotation. Although the laser lines formed on the patient's left side, right side, chest and abdomen coincide with the marked lines on the patient's body surface, the patient's position on the linear accelerator has changed compared to the position on the CT scanning device, and the positioning accuracy is low.

[0057] like Figure 7 As shown, this embodiment provides a dual-plane radiotherapy laser positioning method, including the following steps:

[0058] S1. CT scanning positioning. The CT scanning equipment includes a laser positioning system. The laser positioning system includes a left laser surface, a right laser surface and a top laser surface. Figure 8 As shown, the left laser surface and the right laser surface are respectively provided with one parallel and two perpendicular fan-shaped laser lines, forming double "cross" shaped laser lines on the left and right sides of the patient, and the top laser surface is provided with two fan-shaped laser lines which are respectively perpendicular to the vertical laser lines in the left laser surface and the right laser surface, and together with the two perpendicular laser lines in the left laser surface and the right laser surface, form a "well" shaped laser line on the chest and abdomen of the patient.

[0059] The parallel laser lines and two perpendicular laser lines on the left laser surface overlap with the parallel laser lines and two perpendicular laser lines on the right laser surface, respectively.

[0060] S2. Draw marking lines on the patient's body surface based on the results of CT scanning positioning.

[0061] like Figure 8 As shown, the marking lines are the same as the laser lines formed by the left laser surface, the right laser surface and the top laser surface on both sides and the chest and abdomen of the patient, that is, the left and right sides are double "cross" shapes, and the chest and abdomen are "well" shapes.

[0062] S3. Positioning: The linear accelerator includes the same laser positioning system as that on the CT machine. Adjust the patient's position on the linear accelerator so that the marking line on the body surface is aligned with the laser positioning line of the linear accelerator.

[0063] like Fig. 9 As shown, the positioning comprises the following steps:

[0064] S31, adjusting the vertical heights of the left laser plane and the right laser plane so that the parallel laser lines coincide with the horizontal lines of the double “cross” marking lines on the left and right sides of the patient;

[0065] S32, adjusting the horizontal directions of the left laser plane and the right laser plane so that the two vertical laser beams coincide with the two vertical lines of the double “cross” marking lines on the left and right sides of the patient respectively;

[0066] like Fig.10As shown in the figure, the double "plus" shaped laser lines formed by the laser positioning system of the linear accelerator on the left side of the patient. At this time, the vertical laser line close to the patient's head coincides with the vertical line close to the head in the double "plus" shaped marking lines, and the vertical laser line far from the patient's head does not coincide with the vertical line far from the head in the double "plus" shaped marking lines. Inside the two vertical lines of the double "plus" shaped marking lines, it indicates that the patient's abdomen is tilted to the right in the head-to-toe direction. At this time, the patient's abdomen needs to be adjusted to the left so that the vertical line far from the head in the double "plus" shaped marking lines on the left side of the patient coincides with the vertical laser line far from the patient's head in the laser positioning system. On the contrary, if the vertical laser line far from the patient's head is outside the two vertical lines of the double "plus" shaped marking lines, it indicates that the patient's abdomen is tilted to the left in the head-to-toe direction. At this time, the patient's abdomen needs to be adjusted to the right. The adjustment method for the patient's right body position is the same as that for the left side.

[0067] S33. Adjust the horizontal direction of the top laser plane so that the two laser lines coincide with the two vertical lines of the "grid" shaped marking lines respectively.

[0068] As Fig.11 shown in the figure, the "grid" shaped laser lines formed by the laser positioning system of the linear accelerator on the patient's chest and abdomen. At this time, the laser line on the left side of the patient coincides with the left vertical line in the "grid" shaped marking lines, and the laser line on the right side does not coincide with the right vertical line. Outside the two vertical lines of the "grid" shaped marking lines, it indicates that the patient's right side has rotated upward. At this time, the patient's right side needs to be adjusted downward so that the vertical line on the patient's right side coincides with the laser line on the right side. On the contrary, if the laser line on the patient's right side is inside the two vertical lines of the "grid" shaped marking lines, it indicates that the patient's right side has rotated downward. At this time, the patient's right side needs to be adjusted upward.

[0069] S4. Implement treatment.

[0070] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solutions of the present invention, rather than limitations on the specific implementation manners of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the claims of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A dual-plane radiotherapy laser positioning method, characterized in that: It includes the following steps: S1. CT scan for positioning. The CT scan device includes a laser positioning system. The laser positioning system includes a left laser plane, a right laser plane and a top laser plane. The left laser plane and the right laser plane are respectively provided with a beam of parallel and two beams of perpendicular fan-shaped laser lines, forming a double "plus" shaped laser line on the left and right sides of the patient. The top laser plane is provided with two beams of fan-shaped laser lines respectively perpendicular to the perpendicular laser lines in the left laser plane and the right laser plane, and together with the two beams of perpendicular laser lines in the left laser plane and the right laser plane, form a "well" shaped laser line on the chest and abdomen of the patient; S2. Make marking lines on the patient's body surface according to the results of the CT scan for positioning; S3. Positioning; The linear accelerator includes the same laser positioning system as that on the CT machine. Adjust the patient's body position on the linear accelerator so that the marking lines on the body surface are aligned with the laser positioning lines of the linear accelerator; S4. Implement treatment.

2. A dual-plane radiotherapy laser positioning method according to claim 1, characterized in that: In step S1, the parallel laser line and the two perpendicular laser lines of the left laser plane coincide with the parallel laser line and the two perpendicular laser lines of the right laser plane respectively.

3. A dual-plane radiotherapy laser positioning method according to claim 1, characterized in that: The marking lines made in step S2 include two connected "plus" shaped marking lines on the left and right sides, and the "well" shaped marking line on the chest and abdomen of the patient.

4. A dual-plane radiotherapy laser positioning method according to claim 3, characterized in that: The positioning in step S3 includes the following steps: S31. Adjust the vertical height of the left laser plane and the right laser plane so that the laser line parallel to the ground coincides with the horizontal lines of the double "plus" shaped marking lines on the left and right sides of the patient; S32. Adjust the horizontal direction of the left laser plane and the right laser plane so that the two beams of laser lines perpendicular to the ground respectively coincide with the two vertical lines of the double "plus" shaped marking lines on the left and right sides of the patient; S33. Adjust the horizontal direction of the top laser plane so that the two beams of laser lines respectively coincide with the two vertical lines of the "well" shaped marking line.

5. A dual-plane radiotherapy laser positioning method according to any one of claims 1 to 4, characterized in that: Different colors are respectively used between the two beams of laser lines perpendicular to the ground in the left laser plane and the right laser plane in the laser positioning system, and between the two beams of laser lines of the top laser plane.

6. A dual-plane radiotherapy laser positioning device, comprising a left laser emitter, a right laser emitter and a top laser emitter, characterized in that: The left laser emitter and the right laser emitter respectively emit a beam of parallel and two beams of perpendicular fan-shaped laser lines; the top laser emitter emits two beams of fan-shaped laser lines perpendicular to the perpendicular laser lines emitted by the left laser emitter and the right laser emitter.

7. A dual-plane radiotherapy laser positioning device according to claim 6, characterized in that: The left laser emitter and the right laser emitter respectively include a main laser emitter and a secondary laser emitter. The main laser emitter emits a beam of parallel and a beam of perpendicular laser lines, and the secondary laser emitter emits a beam of perpendicular laser lines, and the distance between the main laser emitter and the secondary laser emitter can be adjusted.

8. A dual-plane radiotherapy laser positioning device according to claim 7, characterized in that: The switches of the main laser emitter and the secondary laser emitter can be controlled separately.

9. A dual-plane radiotherapy laser positioning device according to claim 6, characterized in that: The two beams of laser lines at the top are emitted by two different laser emitters, and the distance between the two laser emitters can be adjusted.

10. A dual-plane radiotherapy laser positioning device according to claim 9, characterized in that: The switches of the two laser emitters at the top can be controlled separately.

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