Shielding device

Abstract

The utility model provides a shielding device. The shielding device comprises a guide assembly, a mounting base, a shielding body and a driver, the guide assembly comprises two guide seats and a plurality of guide columns; the two guide seats are oppositely arranged on the detector shell; the plurality of guide columns are uniformly arranged between the two guide seats; the mounting base is arranged on the plurality of guide columns in a sliding manner; the shielding body is arranged on one side of the mounting base; the shielding body comprises a plurality of shielding blocks which are distributed in a step shape; the plurality of shielding blocks are sequentially arranged along the extension direction of the mounting base; every two adjacent shielding blocks are engaged with each other and are in a step shape. The thickness values of the plurality of shielding blocks are sequentially reduced from the bottom end to the top end of the shielding body; the driver is arranged on the guide seat; and the output end of the driver is fixedly connected with the mounting base. The CT detector can be protected from being damaged by scattered rays.

Description

Technical Field

[0001] The present application relates to the technical field of radiotherapy, and in particular to a shielding device. Background Art

[0002] In a coaxial coplanar radiotherapy device, a computed tomography (CT) imaging component and a radiotherapy component are usually integrated together, arranged on the same rotating frame, and a CT detector is used for CT imaging.

[0003] When the above-mentioned radiotherapy assembly is used for radiotherapy, the accelerator tube in the radiotherapy assembly will output a treatment beam to the patient on the treatment bed. The treatment beam will be scattered after being output from the accelerator tube, and the smaller the angle with the beam irradiation direction, the more severe the ray scattering. If the CT detector receives these scattered rays, these scattered rays will damage the CT detection circuit in the CT detector. Utility Model Content

[0004] In view of this, the utility model provides a shielding device, so as to protect the CT detector from being damaged by scattered rays.

[0005] The technical solution of the utility model is specifically achieved as follows:

[0006] A shielding device, comprising: a guide assembly, a mounting base, a shielding body and a driver;

[0007] The guide assembly comprises: two guide seats and a plurality of guide posts; the two guide seats are arranged on the detector housing in a relative manner; the plurality of guide posts are evenly arranged between the two guide seats;

[0008] The mounting base is slidably disposed on the plurality of guide posts;

[0009] The shielding body is arranged on one side of the mounting base; the shielding body comprises: a plurality of shielding blocks distributed in a stepped manner; the plurality of shielding blocks are arranged in sequence along the extension direction of the mounting base; two adjacent shielding blocks are engaged with each other to present a stepped shape; and the thickness values ​​of the plurality of shielding blocks decrease in sequence from the bottom end to the top end of the shielding body;

[0010] The driver is arranged on the guide seat; the output end of the driver is fixedly connected to the mounting base.

[0011] Preferably, the shielding body comprises: a first shielding block, a second shielding block, a third shielding block, a fourth shielding block, a fifth shielding block and a sixth shielding block;

[0012] The thickness values ​​of the first shielding block, the second shielding block, the third shielding block, the fourth shielding block, the fifth shielding block and the sixth shielding block decrease in sequence;

[0013] The bottom end of the first shielding block is located at a first angle between the primary scattered line and the main beam direction, and the top end is located at a second angle between the primary scattered line and the main beam direction;

[0014] The bottom end of the second shielding block is located at a second angle between the primary scattered line and the main beam direction, and the top end is located at a third angle between the primary scattered line and the main beam direction;

[0015] The bottom end of the third shielding block is located at a third angle between the primary scattered ray and the main beam direction, and the top end is located at a fourth angle between the primary scattered ray and the main beam direction;

[0016] The bottom end of the fourth shielding block is located at a fourth angle between the primary scattered ray and the main beam direction, and the top end is located at a fifth angle between the primary scattered ray and the main beam direction;

[0017] The bottom end of the fifth shielding block is located at the fifth angle between the primary scattered ray and the main beam direction, and the top end is located at the sixth angle between the primary scattered ray and the main beam direction;

[0018] The bottom end of the sixth shielding block is located at the sixth angle between the primary scattered ray and the main beam direction, and the top end is located at the seventh angle between the primary scattered ray and the main beam direction.

[0019] Preferably, the first angle is 0°; the second angle is 20°; the third angle is 30°; the fourth angle is 45°; the fifth angle is 60°; the sixth angle is 90°; and the seventh angle is 135°.

[0020] Preferably, the shielding body is an integral structure or an assembled structure.

[0021] Preferably, the shielding device further comprises: at least one set of position limiting components;

[0022] The limit assembly comprises: a limit block and at least one travel switch;

[0023] The limit block is arranged at one end of the mounting base; the travel switch is arranged at a preset position at one end of the detector housing and is electrically connected to the driver.

[0024] Preferably, when the shielding device includes a set of limiter components, the limiter block is arranged at the bottom or top of the mounting base, and the travel switch is arranged at a preset position at the bottom or top of the detector housing;

[0025] When the shielding device includes two sets of limit assemblies, two limit blocks are respectively arranged at two ends of the mounting base; and two travel switches are respectively arranged at preset positions at two ends of the detector housing.

[0026] Preferably, a plurality of guide holes are provided on the mounting base;

[0027] The mounting base is penetrated on the multiple guide posts of the guide assembly through the multiple guide holes.

[0028] Preferably, the thickness of the mounting base at both ends is greater than the thickness of the middle portion.

[0029] Preferably, one or more weight-reducing holes are provided at both ends of the mounting base.

[0030] Preferably, the driver is a driving motor.

[0031] As can be seen from the above, in the shielding device of the present invention, since a shielding body is provided on one side of the mounting base, and the mounting base is slidably provided on a plurality of guide posts, and the output end of the driver is fixedly connected to the mounting base, the mounting base can be driven by the driver to slide to a preset position along the length direction of the guide posts, thereby driving the shielding body to move to the preset position, so that the shielding body can be used to shield the rays scattered from the main beam of the accelerator to the surface of the CT detector, thereby protecting the CT detector from damage by scattered rays. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the shielding device in the embodiment of the utility model. DETAILED DESCRIPTION

[0033] In order to make the technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] Figure 1 Schematic diagram of the structure of the shielding device in the embodiment of the utility model, as shown in Figure 1 As shown, the shielding device in the embodiment of the utility model comprises: a guide assembly 11, a mounting base 12, a shielding body 13 and a driver 14;

[0035] The guide assembly 11 includes: two guide seats 111 and a plurality of guide posts 112; the two guide seats 111 are arranged on the detector housing 10 in a relative manner; the plurality of guide posts 112 are evenly arranged between the two guide seats 111;

[0036] The mounting base 12 is slidably disposed on the plurality of guide posts 112;

[0037] The shielding body 13 is arranged on one side of the mounting base 12;

[0038] The driver 14 is disposed on the guide seat 111 ; an output end of the driver 14 is fixedly connected to the mounting base 12 .

[0039] In the above-mentioned shielding device of the present application, the shielding body is arranged on one side of the mounting base, and the mounting base is slidably arranged on a plurality of guide pillars, the driver is fixedly arranged on one of the two guide seats, and its output end is fixedly connected to the mounting base, therefore, the mounting base can be driven by the driver to slide to a preset position along the length direction of the guide pillar, thereby driving the shielding body to move to the preset position, so that the shielding body can be used to shield the rays scattered from the accelerator main beam to the surface of the CT detector, thereby protecting the CT detector from damage by scattered rays.

[0040] For example, when the accelerator outputs rays, the driver can drive the mounting base to slide on the guide column to a preset first position, so that the shielding body moves to the top of the CT detector to shield the CT detector, thereby protecting the CT detector from damage by scattered rays output by the accelerator; and when the CT tube outputs rays, the driver can drive the mounting base to slide on the guide column to a preset second position, so that the shielding body moves outside the receiving range of the CT detector surface, so that the CT detector can receive the rays output by the CT tube and perform CT imaging normally.

[0041] In addition, in the technical solution of the present application, the above-mentioned shielding device can be implemented through a variety of specific implementation methods. The following will take several specific methods as examples to introduce the technical solution of the present application in detail.

[0042] For example, as an example, in a preferred specific embodiment of the present application, the shielding device may further include: at least one set of position limiting components;

[0043] The limit assembly includes: a limit block 151 and at least one travel switch 152;

[0044] The limit block 151 is disposed at one end of the mounting base 12 ; the travel switch 152 is disposed at a preset position at one end of the detector housing 10 and is electrically connected to the driver 14 .

[0045] Therefore, when the mounting base slides to the preset position, the limit block located at one end of the mounting base will touch the travel switch set on the detector housing; at this time, the travel switch can send a preset electrical signal to the driver, and the driver can perform corresponding operations according to the received electrical signal (for example, driving the mounting base to stop sliding).

[0046] In addition, in the technical solution of the present application, one or more groups of limit components can be set according to the needs of the actual application scenario.

[0047] For example, when a set of limiter components is provided, the limiter block may be provided at the bottom (or top) of the mounting base, and the travel switch may be provided at a preset position at the bottom (or top) of the detector housing.

[0048] For another example, when two sets of limit assemblies are provided, two limit blocks may be provided at two ends of the mounting base respectively; and two travel switches may be provided at preset positions at two ends of the detector housing respectively.

[0049] In addition, in the technical solution of the present application, one or more travel switches can be provided in a limit assembly according to the needs of the actual application scenario.

[0050] For example, as an example, in a preferred specific embodiment of the present application, the limit assembly includes: a limit block and two travel switches.

[0051] The travel of the shielding body arranged on the mounting base can be limited by the two travel switches mentioned above.

[0052] In addition, in the technical solution of the present application, the thickness of the shielding body may be uniform or non-uniform.

[0053] In the above specific embodiments of the present application, the shielding body can be designed to have a non-uniform thickness according to the distribution characteristics of the rays, so that the dose level reaching the surface of the CT detector can be maintained at a uniform level; in addition, the weight of the shielding body can be reduced as much as possible while meeting the requirements for shielding rays, so as to reduce the weight of the entire machine as much as possible.

[0054] For example, the radiation reaching the detector is mainly primary scattered radiation, and the dose rate of the rays reaching the detector surface can be controlled to be less than 2 cGy / min. Therefore, the thickness of the shield can be calculated based on the scattering coefficient, the average area during intensity modulated radiotherapy, the isocenter dose rate and other data. Therefore, it can be seen that the thickness of the shield close to the front of the beam can be larger, and the thickness of the shield can decrease as the angle with the beam advance direction increases.

[0055] For example, as an example, in a preferred specific embodiment of the present application, the thickness value of the bottom end of the shielding body is greater than the thickness value of the top end of the shielding body.

[0056] The bottom end of the shielding body is located close to the beam, while the top end of the shielding body is located far from the beam.

[0057] In addition, in the technical solution of the present application, the shielding body may be an integral structure or an assembled structure.

[0058] For example, as an example, in a preferred specific embodiment of the present application, the shielding body is an integral structure; the thickness of the shielding body gradually decreases from the bottom end to the top end of the shielding body.

[0059] For another example, as an example, in a preferred specific embodiment of the present application, the shielding body 13 includes: a plurality of shielding blocks 131 distributed in a stepped shape;

[0060] The plurality of shielding blocks 131 are arranged in sequence along the extension direction of the mounting base 12 ; two adjacent shielding blocks 131 are engaged with each other to present a step shape.

[0061] For another example, as an example, in a preferred specific embodiment of the present application, the thickness values ​​of the plurality of shielding blocks decrease sequentially from the bottom end to the top end of the shielding body.

[0062] Therefore, the above-mentioned multiple mutually engaged shielding blocks can be distributed in a stepped manner, each step is an independent shielding block, and adjacent shielding blocks are stepped and mutually engaged, thereby preventing radiation from leaking from between the shielding blocks to the CT detector.

[0063] In addition, in the technical solution of the present application, in order to simplify the structure and reduce the processing cost, a preset number of shielding blocks can be assembled into a shielding body according to the needs of the actual application scenario.

[0064] For example, as an example, in a preferred specific embodiment of the present application, the shielding body may include: a first shielding block, a second shielding block, a third shielding block, a fourth shielding block, a fifth shielding block and a sixth shielding block;

[0065] The thickness values ​​of the first shielding block, the second shielding block, the third shielding block, the fourth shielding block, the fifth shielding block and the sixth shielding block decrease in sequence;

[0066] The bottom end of the first shielding block is located at a first angle between the primary scattered line and the main beam direction, and the top end is located at a second angle between the primary scattered line and the main beam direction;

[0067] The bottom end of the second shielding block is located at a second angle between the primary scattered line and the main beam direction, and the top end is located at a third angle between the primary scattered line and the main beam direction;

[0068] The bottom end of the third shielding block is located at a third angle between the primary scattered ray and the main beam direction, and the top end is located at a fourth angle between the primary scattered ray and the main beam direction;

[0069] The bottom end of the fourth shielding block is located at a fourth angle between the primary scattered ray and the main beam direction, and the top end is located at a fifth angle between the primary scattered ray and the main beam direction;

[0070] The bottom end of the fifth shielding block is located at the fifth angle between the primary scattered ray and the main beam direction, and the top end is located at the sixth angle between the primary scattered ray and the main beam direction;

[0071] The bottom end of the sixth shielding block is located at the sixth angle between the primary scattered ray and the main beam direction, and the top end is located at the seventh angle between the primary scattered ray and the main beam direction.

[0072] In addition, in the technical solution of the present application, specific values ​​of the above seven angles can be preset according to the needs of the actual application scenario.

[0073] For example, as an example, in a preferred specific embodiment of the present application, the first angle is 0°; the second angle is 20°; the third angle is 30°; the fourth angle is 45°; the fifth angle is 60°; the sixth angle is 90°; and the seventh angle is 135°.

[0074] Of course, in the technical solution of the present application, the specific values ​​of the above seven angles may also be set to other values, which are not listed one by one here.

[0075] In addition, as an example, in a preferred specific embodiment of the present application, a plurality of guide holes are provided on the mounting base; the mounting base is passed through the plurality of guide holes and is arranged on the plurality of guide columns of the guide assembly, so that the mounting base can slide in the length direction of the guide columns.

[0076] In addition, as an example, in a preferred specific embodiment of the present application, the thickness value at both ends of the mounting base is greater than the thickness value in the middle part, so that the mounting base is thick at both ends and thin in the middle. This can reduce the weight of the mounting base as much as possible while ensuring that there is enough space to install the shielding body and the guide assembly, so as to reduce the weight of the entire machine as much as possible.

[0077] In addition, as an example, in a preferred specific embodiment of the present application, one or more weight-reducing holes may be provided at both ends of the mounting base, thereby further reducing the weight of the mounting base.

[0078] In addition, as an example, in a preferred specific embodiment of the present application, the driver may be a driving motor or other suitable driving devices, which are not listed here one by one.

[0079] In summary, in the technical solution of the present application, since a shielding body is provided on one side of the mounting base in the above-mentioned shielding device of the present application, and the mounting base is slidably provided on a plurality of guide pillars, and the output end of the driver is fixedly connected to the mounting base, the mounting base can be driven by the driver to slide to a preset position along the length direction of the guide pillars, thereby driving the shielding body to move to the preset position, so that the shielding body can be used to shield the rays scattered from the accelerator main beam to the surface of the CT detector, thereby protecting the CT detector from damage by scattered rays.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A shielding device, characterized in that: The shielding device comprises: a guide assembly, a mounting base, a shielding body and a driver; The guide assembly comprises: two guide seats and a plurality of guide posts; the two guide seats are arranged on the detector housing in a relative manner; the plurality of guide posts are evenly arranged between the two guide seats; The mounting base is slidably disposed on the plurality of guide posts; The shielding body is arranged on one side of the mounting base; the shielding body comprises: a plurality of shielding blocks distributed in a stepped manner; the plurality of shielding blocks are arranged in sequence along the extension direction of the mounting base; two adjacent shielding blocks are engaged with each other to present a stepped shape; and the thickness values ​​of the plurality of shielding blocks decrease in sequence from the bottom end to the top end of the shielding body; The driver is arranged on the guide seat; the output end of the driver is fixedly connected to the mounting base.

2. The shielding device according to claim 1, characterized in that The shielding body comprises: a first shielding block, a second shielding block, a third shielding block, a fourth shielding block, a fifth shielding block and a sixth shielding block; The thickness values ​​of the first shielding block, the second shielding block, the third shielding block, the fourth shielding block, the fifth shielding block and the sixth shielding block decrease in sequence; The bottom end of the first shielding block is located at a first angle between the primary scattered line and the main beam direction, and the top end is located at a second angle between the primary scattered line and the main beam direction; The bottom end of the second shielding block is located at a second angle between the primary scattered line and the main beam direction, and the top end is located at a third angle between the primary scattered line and the main beam direction; The bottom end of the third shielding block is located at a third angle between the primary scattered ray and the main beam direction, and the top end is located at a fourth angle between the primary scattered ray and the main beam direction; The bottom end of the fourth shielding block is located at a fourth angle between the primary scattered ray and the main beam direction, and the top end is located at a fifth angle between the primary scattered ray and the main beam direction; The bottom end of the fifth shielding block is located at the fifth angle between the primary scattered ray and the main beam direction, and the top end is located at the sixth angle between the primary scattered ray and the main beam direction; The bottom end of the sixth shielding block is located at the sixth angle between the primary scattered ray and the main beam direction, and the top end is located at the seventh angle between the primary scattered ray and the main beam direction.

3. The shielding device according to claim 2, characterized in that: The first angle is 0°; the second angle is 20°; the third angle is 30°; the fourth angle is 45°; the fifth angle is 60°; the sixth angle is 90°; and the seventh angle is 135°.

4. The shielding device according to claim 1, characterized in that: The shielding body is an integrated structure or an assembled structure.

5. The shielding device according to claim 1, characterized in that The shielding device further comprises: at least one set of position limiting components; The limit assembly comprises: a limit block and at least one travel switch; The limit block is arranged at one end of the mounting base; the travel switch is arranged at a preset position at one end of the detector housing and is electrically connected to the driver.

6. The shielding device according to claim 5, characterized in that: When the shielding device includes a set of limiter components, the limiter block is arranged at the bottom or top of the mounting base, and the travel switch is arranged at a preset position at the bottom or top of the detector housing; When the shielding device includes two sets of limit assemblies, two limit blocks are respectively arranged at two ends of the mounting base; and two travel switches are respectively arranged at preset positions at two ends of the detector housing.

7. The shielding device according to claim 1, characterized in that: The mounting base is provided with a plurality of guide holes; The mounting base is penetrated on the multiple guide posts of the guide assembly through the multiple guide holes.

8. The shielding device according to claim 1, characterized in that: The thickness of the two ends of the mounting base is greater than the thickness of the middle portion.

9. The shielding device according to claim 1, characterized in that: One or more weight-reducing holes are also provided at both ends of the mounting base.

10. The shielding device according to claim 1, characterized in that: The driver is a driving motor.

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