Linear accelerator, verification method and fault detection method of linear accelerator

Abstract

The present invention discloses a linear accelerator, a verification method and a fault detection method for the linear accelerator. The linear accelerator includes a multi-leaf grating and a light field lamp device; the multi-leaf grating includes a base, at least two blade groups and a first slide; a groove is provided on the base, the groove runs through the upper surface and the lower surface of the base, and extends along a first direction; the first slide is arranged on the upper surface of the base, and extends along a second direction; the second direction is perpendicular to the first direction; the first slide is located on both sides of the first symmetry axis of the groove, and the first symmetry axis is parallel to the second direction; the vertical projection of the first slide on the base does not overlap with the groove; the light field lamp device includes a slide sub-rail; the slide sub-rail is engaged in the first slide, and the light field lamp device moves along the second direction, and is used to move to a working position along the first slide, so that the light emitting surface of the light field lamp device is located on the isocenter plane of the linear accelerator, and emits a light beam to the blade group. The embodiment of the present invention can save space of the linear accelerator.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of medical equipment, and in particular to a linear accelerator, a verification method and a fault detection method of a linear accelerator. Background Art

[0002] Medical linear accelerator refers to an accelerator that uses microwave electromagnetic fields to accelerate electrons and has a linear motion track. It is a medical device used for radiotherapy of tumors or other lesions in patients. It can generate high-energy X-rays and electron beams, and has the characteristics of high dose rate, short irradiation time, large irradiation field, good dose uniformity and stability, and small penumbra area.

[0003] The multileaf collimator is an important component of the medical linear accelerator. In the traditional linear accelerator, the light field device and the multileaf collimator are two independent devices, both installed in the treatment head of the linear accelerator. Since this structure requires a separate space in the linear accelerator to install the light field lamp device, it occupies a lot of space in the linear accelerator. Summary of the invention

[0004] The present invention provides a linear accelerator, a verification method for the linear accelerator and a fault judgment method, so as to save the space of the linear accelerator and make the linear accelerator more compact.

[0005] In a first aspect, an embodiment of the present invention provides a linear accelerator, the linear accelerator comprising: a multi-leaf collimator and a light field lamp device;

[0006] The multi-leaf grating comprises a base, at least two blade groups and a first slideway;

[0007] The base is provided with a groove; the groove passes through the upper surface and the lower surface of the base and extends along the first direction;

[0008] The first slideway is disposed on the upper surface of the base and extends along a second direction; the second direction is perpendicular to the first direction; the first slideway is located on both sides of a first symmetry axis of the groove, wherein the first symmetry axis is parallel to the second direction; a vertical projection of the first slideway on the base does not overlap with the groove;

[0009] Each of the blade groups comprises an upper blade group and a lower blade group; the upper blade group and the lower blade group are arranged in sequence along a direction perpendicular to the base; the upper blade group and the lower blade group each comprise a plurality of blades; the blades extend along the first direction and are arranged along the second direction; the number of blades in the upper blade group is equal to the number of blades in the lower blade group; all the upper blade groups are located in the groove and are symmetrically distributed along the first symmetry axis; the blade group moves along the first direction;

[0010] The light field lamp device includes a slide auxiliary rail; the slide auxiliary rail is engaged in the first slide, and the light field lamp device moves along the second direction; the light field lamp device is used to move along the first slide to a working position so that the light output surface of the light field lamp device is located on the isocenter plane of the linear accelerator and emits a light beam to the blade group.

[0011] In a second aspect, an embodiment of the present invention further provides a linear accelerator verification method, which is applicable to any linear accelerator provided in the first aspect and is used to verify the consistency between the light field and the radiation field of the linear accelerator.

[0012] The method includes:

[0013] Open the upper blade group, control the movement of blades in the lower blade group, and turn on the light field lamp device;

[0014] Acquire the light field pattern of the lower blade group, and record the positions of all blades in the lower blade group;

[0015] Turn off the light field lamp device, control the linear accelerator to generate rays, and obtain the radiation field diagram of the lower blade group;

[0016] Verifying the consistency of the light field and the radiation field of the lower blade group according to the light field graph and the radiation field graph of the lower blade group;

[0017] The lower blade group is opened, and according to the recorded positions of all blades in the lower blade group, corresponding blades in the upper blade group are controlled to move to the same position;

[0018] The radiation field diagram of the upper blade group is obtained, and the consistency between the light field and the radiation field of the upper blade group is verified according to the radiation field diagram of the lower blade group and the radiation field diagram of the upper blade group.

[0019] In a third aspect, an embodiment of the present invention further provides a linear accelerator fault detection method, which is applicable to any linear accelerator including a cross-line device provided in the first aspect, and is used to detect a fault of the linear accelerator. The method comprises:

[0020] Move the light field lamp device to the working position and turn on the light field lamp device;

[0021] Acquire light projection images of two cross-line devices;

[0022] Determining whether two cross-line projections in the light projection image overlap;

[0023] If not, then the linear accelerator has failed.

[0024] The embodiment of the present invention is provided with a first slide on the base of the multi-leaf grating, the first slide extends along the second direction, the first slide is provided on both sides of the first symmetry axis of the groove, the vertical projection of the first slide on the base does not overlap with the groove, wherein the first symmetry axis is parallel to the second direction, the second direction is perpendicular to the extension direction of the groove, and a slide sub-rail is provided on the light field lamp device, the slide sub-rail is engaged in the first slide, so that the light field lamp device can move along the second direction; when the light field lamp device is in a working state, the light field lamp device moves to the working position along the first slide, the light emitting surface of the light field lamp device is located at the isocenter plane of the linear accelerator, and the light beam is emitted to the blade group, thereby realizing the integration of the multi-leaf grating and the light field lamp device, and making full use of the effective space of the multi-leaf grating. Therefore, there is no need to reserve an independent space in the treatment head of the linear accelerator to install the light field lamp device, which saves space in the linear accelerator, and is conducive to improving the compactness of the linear accelerator as a whole and miniaturization of the linear accelerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a top view structure of a linear accelerator provided by an embodiment of the present invention;

[0026] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure along the first symmetry axis S;

[0027] Figure 3 A schematic diagram of the structure of a light field lamp device provided by an embodiment of the present invention;

[0028] Figure 4 A schematic diagram of internal light beam transmission of a light field lamp device provided by an embodiment of the present invention;

[0029] Figure 5 A schematic diagram of the structure of a light source assembly provided by an embodiment of the present invention;

[0030] Figure 6 A schematic diagram of a planar structure of a blade provided in an embodiment of the present invention;

[0031] Figure 7 A schematic diagram of the structure of a multi-leaf grating provided by an embodiment of the present invention;

[0032] Figure 8 A schematic diagram of the structure of a second slide provided by an embodiment of the present invention;

[0033] Fig. 9 A schematic diagram of the side structure of a base provided in an embodiment of the present invention;

[0034] Fig.10 A schematic diagram of the structure of a driving device provided by an embodiment of the present invention;

[0035] Fig.11 for Figure 1 A schematic diagram of a local cross-sectional structure along the first symmetry axis S;

[0036] Fig.12 A schematic diagram of a top view of a cross-line device provided in an embodiment of the present invention;

[0037] Fig.13 A schematic flow chart of a linear accelerator verification method provided by an embodiment of the present invention;

[0038] Fig.14 A schematic flow chart of a linear accelerator fault detection method provided by an embodiment of the present invention;

[0039] Fig.15 A schematic flow chart of another linear accelerator fault detection method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0041] Figure 1 FIG. 1 is a schematic diagram of a top view of a linear accelerator provided in an embodiment of the present invention. Figure 1 As shown, the linear accelerator 100 includes: a multi-leaf collimator 110 and a light field lamp device 120;

[0042] The multi-leaf grating 110 includes a base 111, at least two blade groups 112 and a first slide 113;

[0043] The base is provided with a groove 111a; the groove 111a penetrates the upper surface and the lower surface of the base 111 and extends along the first direction;

[0044] The first slideway 113 is disposed on the upper surface of the base 111 and extends along the second direction; the second direction is perpendicular to the first direction; the first slideway 113 is located on both sides of the first symmetry axis S of the groove 111a, wherein the first symmetry axis S is parallel to the second direction; the vertical projection of the first slideway 113 on the base 111 does not overlap with the groove 111a;

[0045] Each blade group 112 includes an upper blade group and a lower blade group; the blade group and the lower blade group are arranged in sequence along a direction perpendicular to the base 111; the upper blade group and the lower blade group each include a plurality of blades; the blades extend along a first direction and are arranged along a second direction; the number of blades in the upper blade group is equal to the number of blades in the lower blade group; all the upper blade groups are located in the groove 111a and are symmetrically distributed along the first symmetry axis S; the blade group 112 moves along the first direction;

[0046] The light field lamp device 120 includes a slide sub-rail; the slide sub-rail is engaged in the first slide 113, and the light field lamp device 120 moves along the second direction; the light field lamp device 120 is used to move along the first slide 113 to the working position so that the light emitting surface of the light field lamp device 120 is located on the isocenter plane of the linear accelerator 100, and emits a light beam to the blade group 112.

[0047] For example, Figure 1 As shown, the first direction can be the Y direction, the second direction can be the X direction, the groove 111a extends along the Y direction, the first slide 113 extends along the X direction, and the first symmetry axis S is the symmetry axis of the groove 111a along the X direction. The light field lamp device 120 moves along the X direction, and the blade group 112 moves along the Y direction. When the light field lamp device 120 is in the working state, the light field lamp device 120 moves along the first slide 113 to the working position. At this time, the light emitting surface of the light field lamp device 120 is on the isocenter plane of the linear accelerator 100, and the light beam emitted by the light field lamp device 120 irradiates the blade group 112. It should be noted that Figure 1 The position of the light field lamp device 120 in the working position is only shown as an example. When the light field lamp device 120 is in the non-working state, the light field lamp device 120 moves along the first slide 113 to the non-working position. At this time, the vertical projection of the light field lamp device 120 on the base 111 does not overlap with the groove 111a.

[0048] Specifically, Figure 2 for Figure 1 The cross-sectional structure diagram along the first symmetry axis S, the same structure uses the above reference numerals, each blade group 112 includes an upper blade group 112a and a lower blade group 112b; along the direction perpendicular to the base 111 (Z direction in the figure), the upper blade group 112a and the lower blade group 112b are arranged in sequence; the upper blade group 112a and the lower blade group 112b each include a plurality of blades 1121; the blades 1121 extend along the Y direction and are arranged along the X direction; the number of blades in the upper blade group 112a is equal to the number of blades in the lower blade group 112b; all upper blade groups 112a are symmetrically distributed along the first symmetry axis S, and the blade group 112 moves along the Y direction. It should be noted that Figure 2It is only exemplarily shown that each upper blade group 112a includes 7 blades 1121, and the present invention does not limit the number of blades in the upper blade group 112a.

[0049] In an embodiment of the present invention, a first slide is provided on the base of the multileaf grating, the first slide extends along the second direction, the first slide is provided on both sides of the first symmetry axis of the groove, the vertical projection of the first slide on the base does not overlap with the groove, wherein the first symmetry axis is parallel to the second direction, and the second direction is perpendicular to the extension direction of the groove, and a slide sub-rail is provided on the light field lamp device, the slide sub-rail is engaged in the first slide, so that the light field lamp device can move along the second direction; when the light field lamp device is in a working state, the light field lamp device moves to a working position along the first slide, the light emitting surface of the light field lamp device is located at the isocenter plane of the linear accelerator, and a light beam is emitted to the blade group. The integration of the multileaf grating and the light field lamp device is realized by the first slide on the base of the multileaf grating and the slide sub-rail on the light field lamp device, and the effective space of the multileaf grating is fully utilized. Therefore, there is no need to reserve an independent space in the treatment head of the linear accelerator to install the light field lamp device, which saves space in the linear accelerator, and is conducive to improving the compactness of the linear accelerator as a whole and miniaturization of the linear accelerator.

[0050] Optional, continue to participate Figure 2 The side surface of the light field lamp device 120 away from the base 111 is at the same height as the side surface of the upper blade group 112a away from the lower blade group 112b.

[0051] Specifically, the same structures use the above-mentioned reference numerals, such as Figure 2 As shown, the distance between the side surface of the light field lamp device 120 away from the base 111 and the upper surface of the base 111 is h1, and the distance between the side surface of the upper blade group 112a away from the lower blade group 112b and the upper surface of the base 111 is h2, and h1=h2. The distance h2 between the side surface of the upper blade group 112a away from the lower blade group 112b and the upper surface of the base 111 determines the height of the multi-leaf grating 110. If h1>h2, then in the linear accelerator, the light field lamp device 120 needs to occupy the space outside the multi-leaf grating 110; if h1=h2, then in the linear accelerator 100, the light field lamp device 120 only occupies the space of the multi-leaf grating 110, and does not occupy the space outside the multi-leaf grating 110, so that the effective space of the multi-leaf grating can be used to the maximum extent.

[0052] Optional, Figure 3 The structure diagram of a field light device provided by an embodiment of the present invention is shown in FIG. The same structure uses the above-mentioned figure numerals, such as Figure 3 As shown, the light field lamp device also includes a light source assembly 122, a first reflector 123, a second reflector 124 and a frame 125;

[0053] The outer wall of the frame 125 is provided with a slideway sub-rail 121; the light source assembly 122, the first reflector 123 and the second reflector 124 are all located in the frame 125; the light beam emitted by the light source assembly 122 passes through the first reflector 123 and the second reflector 124 in sequence and then is emitted.

[0054] Specifically, the light beam emitted by the light source assembly 122 is reflected by the first reflector 123 to form a first reflected light, the first reflected light is incident on the second reflector 124, and is reflected by the second reflector 124 to form a second reflected light, which is the light beam emitted by the field lamp device. Figure 4 Schematic diagram of internal light beam transmission of a light field lamp device provided in an embodiment of the present invention, the same structure uses the above-mentioned figure numerals, such as Figure 4 As shown, the incident angle of the first reflected light incident on the first reflector 123 is θ1, and the exit angle of the first reflected light is θ2, θ2=θ1; the incident angle of the first reflected light incident on the second reflector 124 is the first reflector θ3, and the exit angle of the second reflected light is θ4, θ4=θ3, wherein θ2=θ3+α, α is the angle between the first reflector 123 and the second reflector 124 (not shown in the figure), that is, θ4=θ1-α, from which it can be seen that the exit angle of the second reflected light is related to the incident angle θ1 and the angle α between the first reflector 123 and the second reflector 124, so by adjusting the angle between the first reflector 123 and the horizontal plane L, the angle between the second reflector 124 and the horizontal plane L can be reduced, wherein the horizontal plane L is the plane where the upper surface of the base 111 is located, thereby reducing the height H1 between the second reflector 124 and the horizontal plane L, thereby reducing the height space occupied by the light field lamp device 120.

[0055] Optional, continue to see Figure 4 , the extension direction of the light source assembly 122 is at an angle to the plane where the base is located. Specifically, the same structure uses the above-mentioned figure marks, and along the second direction X, the width space W2 occupied by the light source assembly 122 is reduced, the horizontal plane L is the plane where the upper surface of the base 111 is located, and along the direction perpendicular to the horizontal plane L (Z direction in the figure), the height space H2 occupied by the light source assembly 122 increases. Since there is a certain height H1 between the second reflector 124 and the horizontal plane L, the light source assembly 122 can make full use of the height space between the second reflector 124 and the horizontal plane L, while reducing the width space W occupied by the light field lamp device 120.

[0056] Optional, Figure 5 FIG. 1 is a schematic diagram of a light source assembly provided by an embodiment of the present invention. Figure 5 As shown, the light source assembly includes a cylindrical light source 210, a concave mirror 220, a first convex lens 230, a second convex lens 240 and a collimator 250;

[0057] The reflective surface of the concave mirror 220 is a parabolic rotation surface. The column light source 210 is located at the focus O1 of the concave mirror 220 and extends along the central axis AA' of the parabolic rotation surface. The backward light emitted by the column light source 210 is reflected by the concave mirror 220 to form a first parallel light.

[0058] The first focus f1 of the first convex lens 230 coincides with the focus f1 of the concave mirror 220, and the optical axis AA' of the first convex lens 230 and the central axis AA' of the parabola rotation surface are located on the same straight line; the first parallel light is transmitted through the first convex lens 230 to form a first converging light, and the forward light emitted by the column light source 210 is transmitted through the first convex lens 230 to form a second parallel light;

[0059] The second focus f2 of the second convex lens 240 coincides with the second focus f2 of the first convex lens 230, the optical axis A-A' of the first convex lens 230 and the optical axis A-A' of the second lens 240 are located on the same straight line, and the first focus of the second convex lens 240 is located between the first convex lens 230 and the second convex lens 240; a central through hole 241 is provided in the central area of ​​the second convex lens 240, and the central through hole 241 penetrates the second convex lens 240 along the direction of the optical axis A-A' of the second lens 240; the first convergent light passes through the central through hole 241 and converges to the second focus f2 of the first convex lens 230, and the second parallel light is transmitted through the second convex lens 240 and converges to the second focus f2 of the second convex lens 240;

[0060] The inner surface of the collimator 250 is a double-conical rotating surface structure, the vertices of the two conical rotating surfaces are opposite, and the central axis A-A' coincides; the central axis A-A' of the conical rotating surface and the optical axis A-A' of the second lens 240 are located on the same straight line; the two conical rotating surfaces are connected through the cone mouth 251, and the center of the cone mouth 251 coincides with the second focus f2 of the first convex lens 230.

[0061] Specifically, Figure 5As shown, the light beam emitted by the column light source 210 is divided into forward light and backward light. The transmission path of the backward light is shown by the solid arrow in the figure, and the transmission path of the forward light is shown by the dotted arrow in the figure. The backward light of the column light source 210 is reflected by the concave mirror 220 to form a first parallel light, and the first parallel light is incident on the first convex lens 230, and is transmitted through the first convex lens 230 to form a first convergent light, and the first convergent light passes through the central through hole 241 of the second convex lens 240. The transmission path of the first convergent light does not change, so it finally converges to the second focus f2 of the first convex lens 230; the forward light of the column light source 210 is transmitted by the first convex lens 230 to form a second parallel light, and the second parallel light is transmitted by the second convex lens 240 to form a second convergent light, and the second convergent light converges at the second focus f2 of the second convex lens 240. Since the second focus f2 of the first convex lens 230 coincides with the second focus f2 of the second convex lens 240 and is located at the center of the cone mouth 251 of the collimator 250, the backward light and the forward light of the column light source 210 are both converged to the center of the cone mouth 251 of the collimator 250 and emitted through the collimator 250. Since the light beam emitted from the collimator 250 , that is, the emitted light of the light source assembly, includes both the forward light and the backward light of the column light source 210 , the utilization rate of the light source is improved.

[0062] Optional, continue to see Figure 5 , the light source assembly further includes a housing 260; Figure 5 The cylindrical light source 210, the concave mirror 220, the first convex lens 230, the second convex lens 240 and the collimator 250 shown in the figure are all accommodated in the housing 260;

[0063] The inner surface of the housing and the inner surface of the collimator 250 are both provided with a reflective layer 270 .

[0064] Specifically, the reflective layer can increase the reflectivity of the inner surface of the housing and the inner surface of the collimator 250, further improving the utilization rate of the light source.

[0065] Optional, Figure 6 A schematic diagram of a planar structure of a blade provided in an embodiment of the present invention, Figure 7 A schematic diagram of the structure of a multi-leaf grating provided by an embodiment of the present invention. Figure 6 and Figure 7 The blade 1121 has a track groove 1121a, which extends along the first direction Y; the track groove 1121a penetrates the blade 1121. Wherein, the blade 1121 is in a sheet shape, and the track groove 1121a penetrates the blade 1121 means that the track groove 1121a penetrates the upper surface and the lower surface of the sheet-shaped blade 1121.

[0066] The multi-leaf collimator further includes a slideway structure 310, which includes a bracket 311 and a second slideway 312 connected to the bracket 311, and the second slideway 312 extends along the second direction Y; the second slideway 312 passes through the track groove 1121a of the blade 1121; the track groove 1121a contacts the second slideway 312 so that the second slideway 312 drives the blade 1121 to move along the first direction Y. One second slideway 312 passes through an upper blade group or a lower blade group along the second direction Y.

[0067] For example, Figure 6 and Figure 7 As shown, the track groove extends along the first direction Y, the second slide 312 extends along the second direction X, and the track groove 1121a contacts the second slide 312 so that the second slide 312 drives the blade 1121 to move along the Y direction. Specifically, the blade 1121 has a penetrating track groove 1121a, and the track groove 1121a has a certain height along the Z direction, so the height of the blade 1121 along the Z direction will increase; because the surface of the blade 1121 parallel to the Z direction (i.e., the front end face) is a cambered surface, as the height of the blade 1121 along the Z direction increases, the curvature of the cambered surface decreases, so the penumbra of the ray on the front end face of the blade 1121 can be reduced.

[0068] Optional, Figure 8 A schematic diagram of the structure of a second slide provided by an embodiment of the present invention, combined with Figure 6-Figure 8 The blade 1121 also includes a guide rod 1121b located in the track groove 1121a; the guide rod 1121b extends along the first direction Y; there are multiple through holes 312a on the second slide 312; the through holes 312a penetrate the second slide 312 along the first direction Y, and the through holes 312a are arranged one-to-one with the guide rod 1121b; the guide rod 1121b passes through the corresponding through holes 312a.

[0069] Specifically, the same structures use the above-mentioned reference numerals, such as Figure 8 As shown, there are multiple through holes 312a on the second slide; the through holes 312a penetrate the second slide 312 along the Y direction, and the through holes 312a are arranged one by one with the guide rods 1121b; the guide rods 1121b pass through the corresponding through holes 312a. In the embodiment of the present invention, the guide rods 1121b of each blade 1121 of a blade group pass through the corresponding through holes 312a of the second slide 312, and the through holes 312a of the second slide 312 are fixed in position, and can be used to limit the blades 1121 in the corresponding blade group, which can prevent the blades 1121 from swinging during the movement, stabilize the position of the blades 1121, so that the displacement movement of the blades is more stable and the position is more accurate.

[0070] Optional, Fig. 9 A schematic diagram of a side view structure of a base provided in an embodiment of the present invention, combined with Figure 7 and Fig. 9 , the same structure uses the above reference numerals, the outer surface of the slideway structure 310 perpendicular to the second slideway 312 is provided with a track auxiliary rail 320, and each blade group 112 corresponds to a pair of track auxiliary rails 320;

[0071] The base 111 further includes a track 111 b on the lower surface, and the track 111 b extends along the first direction Y. The track auxiliary track 320 is engaged in the track 111 b, and the blade assembly 112 moves integrally along the track 111 b.

[0072] Specifically, each blade group 112 corresponds to a pair of track sub-rails 320, and the track sub-rails 320 can move along the Y direction on the track 111b. Fig. 9 Two groups of blade groups 112 are shown as an example, wherein the blade group 112 on the left side of the dotted line moves as a whole to the left edge of the track 111b along the Y direction, and the blade group 112 on the right side of the dotted line moves as a whole to the right edge of the track 111b along the Y direction. Since the second slideway 312 in the above embodiment is engaged with the inside of the blade 112, it is difficult to disassemble and repair the blade 1121 when it fails. In this embodiment, the blade group 112 can be easily moved to the edge of the track 111b and detached from the track 111b. After the entire blade group 112 is disassembled, the single blade 1121 can be replaced or repaired.

[0073] Optional, Fig.10 Schematic diagram of a driving device provided by an embodiment of the present invention. Fig.10 As shown, the linear accelerator further includes a plurality of driving devices 130; the driving devices 130 correspond one to one with the blades 1121;

[0074] The driving device 130 includes a slide frame 131, a motor 132 and a push-pull rod 133; the slide frame 131 is fixed in the second slide 312, and the motor 132 is fixed in the slide frame 131; one end of the push-pull rod 133 is fixed on the blade 1121, and the other end of the push-pull rod 133 is connected to the motor 132.

[0075] For example, Fig.10As shown, a driving device 130 includes two motors 132 and two push-pull rods 133. One end of the push-pull rod 133 passes through the slide frame 131 along the Y direction and is connected to the motor 132. The motor 132 is fixed in the slide frame 131. The rotation of the motor 132 can drive the push-pull rod 133 to slide in the Y direction. Since the other end of the push-pull rod 133 is fixed to the blade 1121, the blade 1121 can be driven to move along the Y direction. It should be noted that when the blade 1121 includes a guide rod 1121b, the guide rod 1121b passes through the slide frame 131 through a through hole in the slide frame 131 along the Y direction. Since the driving device 130 is arranged inside the second slide 312, the space inside the second slide 312 is effectively utilized, saving the overall space. At the same time, since the driving device 130 is arranged inside the blade 1121, the blade 1121 can block the radiation irradiated to the driving device 130, reducing the damage caused by the radiation to the electronic components in the driving device 130, thereby reducing the failure rate of the driving device 130.

[0076] Optional, Fig.11 for Figure 1 A schematic diagram of a local cross-sectional structure along the first symmetry axis S. Fig.11 As shown, the linear accelerator further includes two cross-line devices 140; the cross-line devices 140 are both located at the isocenter plane of the linear accelerator.

[0077] Specifically, Fig.12 A schematic diagram of a top view of a cross-line device provided in an embodiment of the present invention is shown in FIG. Fig.12 As shown, the cross-line device 140 includes a first line 141 extending along the X direction and a second line 142 extending along the Y direction, and the first line 141 and the second line 142 overlap at their respective centers to form a cross-shaped line. The material of the first line 141 and the second line 142 in the cross-line device 140 is a high shielding material that can shield rays, such as a tungsten alloy material. The same structure uses the above-mentioned figure marks. Since the light field lamp device 120 is at work, its light exit surface is located at the isocenter plane of the linear accelerator 100, and the ray exit surface is located at the isocenter plane of the linear accelerator 100, the cross-line device 140 is set at the isocenter plane of the linear accelerator 100 to obtain an accurate cross-line projection image. The cross-line device 140 is used to detect the fault of the linear accelerator 100. If the two cross-line projections overlap in the light projection image of the cross-line device 140, it means that the linear accelerator 100 is working normally; if the two cross-line projections do not overlap, it means that the linear accelerator 100 has a fault.

[0078] Optional, continue to see Fig.11, one cross-line device 140 is located at the side of the lower blade group 112b away from the upper blade group 112a and the other cross-line device 140 is located between the upper blade group 112a and the lower blade group 112b. In other embodiments, both cross-line devices 140 may be located at the side of the lower blade group 112b away from the upper blade group 112a, or both cross-line devices 140 may be located between the upper blade group 112a and the lower blade group 112b, and this application does not make any specific limitation.

[0079] Based on the same inventive concept, an embodiment of the present invention further provides a linear accelerator verification method, which is used to verify the consistency between the light field and the radiation field of any of the linear accelerators mentioned above.

[0080] The rays generated by the linear accelerator are invisible, and it is difficult to detect whether the radiation field formed after the rays pass through the blade group is consistent with the area that the user needs to irradiate. Therefore, the light field lamp device simulates the radiation to irradiate the blade group to detect whether the light field of the blade group is consistent with the area that the user needs to irradiate. If they are consistent, it is considered that the linear accelerator can be used normally. If not, the linear accelerator needs to be adjusted to make the light field of the blade group consistent with the area that the user needs to irradiate. Before this process, it is necessary to verify whether the light field lamp device can simulate the rays, that is, whether the light field formed after the light field lamp device irradiates the blade group is consistent with the radiation field formed after the rays irradiate the blade group.

[0081] In the linear accelerator in the above embodiment of the present invention, the light field lamp device is fixed on the base of the multi-leaf grating. When the light field lamp device is in the working position, the upper blade group is opened to a certain extent, so the consistency of the light field and the radiation field of the upper blade group cannot be directly verified. Therefore, the embodiment of the present invention verifies the consistency of the light field and the radiation field of the upper blade group through the light field pattern and the radiation field pattern of the lower blade group.

[0082] Fig.13 A schematic diagram of a linear accelerator verification method provided by an embodiment of the present invention. Fig.13 As shown, the method specifically comprises the following steps:

[0083] S110, opening the upper blade group, controlling the movement of blades in the lower blade group, and turning on the light field lamp device;

[0084] S120, obtaining a light field pattern of the lower blade group, and recording positions of all blades in the lower blade group;

[0085] S130, turning off the light field lamp device, controlling the linear accelerator to generate rays, and obtaining a radiation field pattern of the lower blade group;

[0086] S140, verifying the consistency of the light field and the radiation field of the lower blade group according to the light field pattern and the radiation field pattern of the lower blade group;

[0087] Specifically, the upper blade group is fully opened so that the blades of the upper blade group will not block the light beam emitted by the light field lamp device, that is, the light beam emitted by the light field lamp device directly shines on the blades of the lower blade group, and the blades in the lower blade group are controlled to move along a first direction to form a target area that needs to be illuminated by the light field lamp device; illustratively, the target area is rectangular, and after the light beam emitted by the light field lamp device shines on the rectangular target area, a rectangular light field pattern of the lower blade group is obtained on the projection surface below the lower blade group, and the positions of all blades in the lower blade group at this time are recorded; after obtaining the rectangular light field pattern of the lower blade group, the light field lamp device is turned off and moved out of the working position, and then Turn on the linear accelerator controller to generate rays, which are directly irradiated to the target area, and a rectangular radiation field pattern of the lower blade group is obtained on the projection surface below the lower blade group; the light-exiting surface of the ray and the distance between it and the lower blade group, as well as the distance between the light-exiting surface of the light field lamp device and the lower blade group are different. When the light field and radiation field of the lower blade group are consistent, there is a proportional relationship between the rectangular radiation field pattern and the rectangular light field pattern, and the proportional relationship is related to the distance between the light-exiting surface of the ray and the light-exiting surface of the light field lamp device. Therefore, the consistency of the light field and radiation field of the lower blade group can be verified based on the light field pattern and radiation field pattern of the lower blade group and the distance between the light-exiting surface of the ray and the light-exiting surface of the light field lamp device. It should be noted that the rectangular target area in the embodiment of the present invention is only for illustrative purposes, and can be any shape in actual applications without specific limitations.

[0088] S150, opening the lower blade group, and controlling corresponding blades in the upper blade group to move to the same position according to the recorded positions of all blades in the lower blade group;

[0089] S160, obtaining the radiation field diagram of the upper blade group, and verifying the consistency between the light field and radiation field of the upper blade group according to the radiation field diagram of the lower blade group and the radiation field diagram of the upper blade group.

[0090] Specifically, the lower blade group is opened so that the light beam passing through the upper blade group will not be blocked, and according to the recorded positions of all the blades in the lower blade group, the corresponding blades in the lower blade group are controlled to move to the same position to reproduce the rectangular target area; the rays are directly irradiated to the rectangular target area formed by the lower blade group, and the rectangular field pattern of the upper blade group is obtained on the projection surface below the upper blade group; there is a proportional relationship between the rectangular field pattern of the upper blade group and the rectangular field pattern of the lower blade group, and the proportional relationship is related to the distance between the light exit surface of the rays and the upper blade group. Therefore, according to the distance between the light exit surface of the rays and the upper blade group, the rectangular field pattern of the lower blade group and the consistent results of the light field and the field of the lower blade group, the consistency of the light field and the field of the upper blade group can be verified.

[0091] The embodiment of the present invention first verifies the light field and radiation field of the lower blade group, and then verifies the consistency of the light field and radiation field of the upper blade group based on the radiation field pattern of the lower blade group and the radiation field image of the upper blade group. This can verify the consistency of the light field and radiation field of the linear accelerator provided by the embodiment of the present invention.

[0092] Based on the same inventive concept, an embodiment of the present invention further provides a linear accelerator fault detection method, which is used to detect the fault of any one of the linear accelerators including a cross-line device described above.

[0093] Fig.14 A schematic diagram of a linear accelerator fault detection method provided by an embodiment of the present invention. Fig.14 As shown, the method specifically comprises the following steps:

[0094] S210, moving the light field lamp device to the working position and turning on the light field lamp device;

[0095] S220, acquiring light projection images of the two cross-line devices;

[0096] S230, determining whether two cross-line projections in the light projection image overlap;

[0097] S240, if no, the linear accelerator fails.

[0098] Specifically, the light field lamp device is moved to the working position, and after the light field lamp device is turned on, the emitted light is irradiated to the cross-line device. The cross part of the cross-line device is opaque, so the light projection images of the two cross-line devices can be obtained; if the two cross-line projections in the light projection image overlap, it means that the light field lamp device in the linear accelerator is normal, and if the two cross-line projections in the light projection image do not overlap, it means that the linear accelerator has a fault. Therefore, the fault of the linear accelerator can be discovered before it is used, so as to avoid using the linear accelerator when the fault occurs, thereby reducing the potential risk of harm to the patient.

[0099] Optional, Fig.15 The present invention provides a schematic flow chart of a linear accelerator fault detection method according to an embodiment of the present invention. Fig.15 As shown, the method specifically comprises the following steps:

[0100] S210, moving the light field lamp device to the working position and turning on the light field lamp device;

[0101] S220, acquiring a light projection image of the cross-line device;

[0102] S230, determining whether two cross-line projections in the light projection image overlap;

[0103] S240, if no, the linear accelerator fails;

[0104] S250, turning off the light field lamp device and controlling the linear accelerator to generate radiation;

[0105] S260, acquiring ray projection images of the two cross-line devices;

[0106] S270, determining whether two cross-line projections in the ray projection image overlap;

[0107] S281, if yes, the light field lamp device fails;

[0108] Specifically, when the two cross-line projections in the light projection image do not overlap, it is possible that the light field lamp device in the linear accelerator is faulty, or it may be that the cross-line device is faulty, so it is necessary to further determine the fault location of the linear accelerator. The linear accelerator is controlled to generate rays, and the rays are irradiated to the cross-line device. Since the cross part of the cross-line device can shield the rays, the ray projection images of the two cross-line devices can be obtained. If the two cross-line projections in the ray projection image overlap, it means that the light field lamp device is faulty;

[0109] Optional, continue to see Fig.15 , the method further comprises the following steps:

[0110] S282, if not, determining whether the position deviation of the two cross-line projections in the light projection image is consistent with the position deviation of the two cross-line projections in the ray projection image;

[0111] S290: If yes, determine whether the two cross-line devices are misaligned.

[0112] Specifically, if the two cross-line projections in the ray projection image do not overlap, and the position deviation of the two cross-line projections in the light projection image is consistent with the position deviation of the two cross-line projections in the ray projection image, it means that the positions of the two cross-line devices are deviated.

[0113] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A linear accelerator, characterized in that: include: Multileaf grating and field light device; The multi-leaf grating comprises a base, at least two blade groups and a first slideway; The base is provided with a groove; the groove passes through the upper surface and the lower surface of the base and extends along the first direction; The first slideway is disposed on the upper surface of the base and extends along a second direction; the second direction is perpendicular to the first direction; the first slideway is located on both sides of a first symmetry axis of the groove, wherein the first symmetry axis is parallel to the second direction; a vertical projection of the first slideway on the base does not overlap with the groove; Each of the blade groups includes an upper blade group and a lower blade group; The upper blade group and the lower blade group are arranged in sequence along a direction perpendicular to the base; the upper blade group and the lower blade group each include a plurality of blades; the blades extend along the first direction and are arranged along the second direction; the number of blades in the upper blade group is equal to the number of blades in the lower blade group; all the upper blade groups are located in the groove and are symmetrically distributed along the first symmetry axis; the blade group moves along the first direction; The light field lamp device comprises a slideway auxiliary rail; the slideway auxiliary rail is engaged in the first slideway, and the light field lamp device moves along the second direction; the light field lamp device is used to move along the first slideway to a working position so that the light emitting surface of the light field lamp device is located on the isocenter plane of the linear accelerator, and emits a light beam to the blade group; The light field lamp device also includes a light source assembly, a first reflector, a second reflector and a frame; The outer side wall of the frame is provided with the slideway auxiliary rail; the light source assembly, the first reflector and the second reflector are all located in the frame; the light beam emitted by the light source assembly passes through the first reflector and the second reflector in sequence and then is emitted; It also includes two cross-line devices; both of the cross-line devices are located on the isocenter plane of the linear accelerator.

2. The linear accelerator according to claim 1, characterized in that: A side surface of the light field lamp device away from the base is at the same height as a side surface of the upper blade group away from the lower blade group.

3. The linear accelerator according to claim 1, characterized in that: An angle exists between the extension direction of the light source assembly and the plane where the base is located.

4. The linear accelerator according to claim 1, characterized in that: The light source assembly includes a cylindrical light source, a concave mirror, a first convex lens, a second convex lens and a collimator; The reflecting surface of the concave mirror is a parabolic rotating surface, the column light source is located at the focus of the concave mirror and extends along the central axis direction of the parabolic rotating surface; the backward light emitted by the column light source is reflected by the concave mirror to form a first parallel light; The first focus of the first convex lens coincides with the focus of the concave mirror, and the optical axis of the first convex lens and the central axis of the parabola rotation surface are located on the same straight line; the first parallel light is transmitted through the first convex lens to form a first converging light, and the forward light emitted by the column light source is transmitted through the first convex lens to form a second parallel light; The second focus of the second convex lens coincides with the second focus of the first convex lens, the optical axis of the first convex lens and the optical axis of the second convex lens are located on the same straight line, and the first focus of the second convex lens is located between the first convex lens and the second convex lens; a central through hole is provided in the central area of ​​the second convex lens, and the central through hole penetrates the second convex lens along the optical axis direction of the second convex lens; the first converging light passes through the central through hole and converges to the second focus of the first convex lens, and the second parallel light is transmitted through the second convex lens and converges to the second focus of the second convex lens; The inner surface of the collimator is a double-conical rotating surface structure, the vertices of the two conical rotating surfaces are opposite, and the central axes coincide with each other; the central axis of the conical rotating surface and the optical axis of the second convex lens are located on the same straight line; the two conical rotating surfaces are connected through a cone port, and the center of the cone port coincides with the second focus of the first convex lens.

5. The linear accelerator according to claim 4, characterized in that: The light source assembly further includes a housing; the cylindrical light source, the concave mirror, the first convex lens, the second convex lens and the collimator are all accommodated in the housing; The inner surface of the shell and the inner surface of the collimator are both provided with a reflective layer.

6. The linear accelerator according to claim 1, characterized in that: The blade has a track groove, and the track groove extends along the first direction; the track groove runs through the blade; The multi-leaf collimator also includes a slide structure, which includes a bracket and a second slide connected to the bracket, the second slide extends along the second direction; the second slide passes through the track groove of the blade; the track groove contacts the second slide so that the second slide drives the blade to move along the first direction.

7. The linear accelerator according to claim 6, characterized in that: The blade also includes a guide rod located in the track groove; the guide rod extends along the first direction; there are multiple through holes on the second slide; the through holes penetrate the second slide along the first direction, and the through holes are arranged one by one with the guide rod; the guide rod passes through the corresponding through holes.

8. The linear accelerator according to claim 6, characterized in that: The outer surface of the slideway structure which is perpendicular to the second slideway is provided with a track auxiliary rail, and each blade group corresponds to a pair of the track auxiliary rails; The base further comprises a track located on the lower surface, and the track extends along the first direction; the track auxiliary track is engaged in the track, and the blade assembly moves as a whole along the track.

9. The linear accelerator according to claim 6, characterized in that: It also includes a plurality of driving devices; the driving devices correspond to the blades one by one; The driving device comprises a slide frame, a motor and a push-pull rod; the slide frame is fixed in the second slide, and the motor is fixed in the slide frame; one end of the push-pull rod is fixed on the blade, and the other end of the push-pull rod is connected to the motor.

10. The linear accelerator according to claim 1, characterized in that: The cross-line device is located on a side of the lower blade group away from the upper blade group, and / or between the upper blade group and the lower blade group.

11. A linear accelerator verification method, applicable to the linear accelerator according to any one of claims 1 to 10, for verifying the consistency between the light field and the radiation field of the linear accelerator, characterized in that: include: Open the upper blade group, control the movement of blades in the lower blade group, and turn on the light field lamp device; Acquire the light field pattern of the lower blade group, and record the positions of all blades in the lower blade group; Turn off the light field lamp device, control the linear accelerator to generate rays, and obtain the radiation field diagram of the lower blade group; Verifying the consistency of the light field and the radiation field of the lower blade group according to the light field graph and the radiation field graph of the lower blade group; The lower blade group is opened, and according to the recorded positions of all blades in the lower blade group, corresponding blades in the upper blade group are controlled to move to the same position; The radiation field diagram of the upper blade group is obtained, and the consistency between the light field and the radiation field of the upper blade group is verified according to the radiation field diagram of the lower blade group and the radiation field diagram of the upper blade group.

12. A linear accelerator fault detection method, applicable to the linear accelerator according to claim 1 or 10, for detecting the fault of the linear accelerator, characterized in that: include: Move the light field lamp device to the working position and turn on the light field lamp device; Acquire light projection images of two cross-line devices; Determining whether two cross-line projections in the light projection image overlap; If not, then the linear accelerator has failed.

13. The linear accelerator fault detection method according to claim 12, characterized in that: If no, then after the linear accelerator fails, the method further includes: Turn off the light field lamp device and control the linear accelerator to generate radiation; Acquiring ray projection images of the two cross-line devices; Determining whether two cross-line projections in the ray projection image overlap; If so, the light field lamp device is faulty.

14. The linear accelerator fault detection method according to claim 13, characterized in that: After determining whether the two cross-line projections in the ray projection image overlap, the method further includes: If not, determining whether the position deviation of the two cross-line projections in the light projection image is consistent with the position deviation of the two cross-line projections in the ray projection image; If so, it is determined that the two cross-hair devices are misaligned.

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