WO2023051392A1

WO2023051392A1 - Ct image-guided radiotherapy device

Info

Publication number: WO2023051392A1
Application number: PCT/CN2022/120785
Authority: WO
Inventors: 宋世鹏
Original assignee: 翰斯泰医疗科技(苏州)有限公司
Priority date: 2021-09-29
Filing date: 2022-09-23
Publication date: 2023-04-06
Also published as: CN113797454A

Abstract

The present application discloses a CT image-guided radiotherapy device, comprising a fixed frame, a rotatable frame, a CT imaging device, and a radiation emitting device. The fixed frame comprises a frame base and an annular frame fixedly connected to the frame base; a first end of the rotatable frame is disposed in a round through hole in the annular frame and is rotatably connected to the annular frame by means of a bearing; a first driving device drives the rotatable frame to rotate in a first direction; a first end of the radiation emitting device is pivotally connected to a supporting frame of the radiation emitting device by means of a connecting piece; a second driving device drives the radiation emitting device to rotate in a second direction. The technical effects and advantages of the present application are: the radiotherapy process is relatively simple; the treatment time is shortened; and the radiotherapy error is reduced; the therapeutic effect is improved; the damage of radiotherapy to normal organs, tissues, and cells of a human body is reduced.

Description

A CT image-guided radiotherapy device

technical field

The present application relates to the technical field of medical devices, in particular to a CT image-guided radiotherapy device.

Background technique

CT scans a layer of a certain thickness of a certain part of the human body with an X-ray beam. The detector receives and passes through this layer and converts it into visible light, which is converted from photoelectricity into an electrical signal, and then passed through an analog/digital converter (analog/digital converter). ) into numbers and input into a computer for processing. CT can accurately detect the slight difference in the density of various tissues on a transverse anatomical plane. CT examination is widely used in the diagnosis of tumors and other diseases, and the diagnosis is relatively reliable. There are many types of CT, mainly including conventional CT, spiral CT, multi-row detector CT and electron beam CT. Among them, multi-row detector CT is also called multi-row spiral CT and multi-layer spiral CT. In the instrument used, multiple layers of images can be reconstructed in one scan, so the inspection time is shorter and the image quality is higher. For the treatment of lung, bone and other diseases, it is suitable to use CT to check the diseases through X-ray imaging.

Radiation therapy for tumors such as lungs and bones usually requires two steps. First, CT imaging equipment is used to collect images to determine the area of radiation treatment, and a radiation treatment plan is made, and then radiation is emitted to the treated area using radiotherapy equipment. Radiation includes radiation Alpha, beta, gamma rays produced by isotopes and x-rays, electron beams, proton beams and other particle beams produced by various x-ray therapy machines or accelerators. CT imaging equipment and radiotherapy equipment are independent of each other. Therefore, after the CT imaging equipment completes image acquisition, it has to be transferred to radiotherapy equipment for radiotherapy, which will make the process of radiotherapy more complicated and take a long time. There is a lack of direct image guidance during radiotherapy, and there are large errors in the treatment, which affects the treatment effect and increases the damage to normal organs, tissues and cells of the human body.

In the prior art, no practical application of the medical electron linear accelerator radiotherapy integrated equipment for image guidance through CT has been found, and the high difficulty of design and manufacturing technology is the main obstacle affecting the development of this technology.

Contents of the invention

The purpose of the present application is to provide a CT image-guided radiotherapy device to solve the problems mentioned in the background art. In order to achieve the above purpose, the present application provides the following technical solutions: a CT image-guided radiotherapy equipment, including:

A fixed frame, including a frame base and a ring frame fixedly connected to the frame base;

The rotating frame, the first end is arranged in the circular through hole of the ring frame and is rotatably connected with the ring frame through bearings, the second end is supported by supporting rollers, and the first driving device drives the rotating frame Rotating along the first direction, the rotating frame is provided with a ray emitting device support frame and an arc slide rail;

A CT imaging device is arranged on the rotating gantry; and

The radiation emitting device is arranged on the rotating frame, the first end is pivotally connected to the support frame of the radiation emitting device through a connecting piece, and the second driving device drives the radiation emitting device to reciprocate in a second direction;

Wherein, when the rotatable gantry and the radiation emitting device rotate simultaneously, the position of the intersection of the radiation beam axis of the CT imaging device and the radiation axis of the radiation emitting device in the treatment space remains unchanged.

Preferably, the rotating rack includes a tubular drum, a first flange is provided at a first end of the drum, a second flange is provided at a second end of the drum, and the first flange The circular through hole of the ring frame is rotatably connected with the ring frame through a bearing, and the treatment space is in the rotating drum.

Preferably, it further includes support rollers fixedly connected to the frame base, and the support rollers support the second flange of the rotating frame.

Preferably, the first driving device includes a driving servo motor and a deceleration mechanism arranged in the frame base, the driving servo motor is connected to the deceleration mechanism, and the output end of the deceleration mechanism is driven by a transmission chain. The first flange is used to rotate the rotating frame.

Preferably, the CT imaging device 3 includes tubes and detectors that are fixedly connected to relative positions on the rotating cylinder, and the rotating cylinder has a narrow and long first ray passage hole and a long and narrow second ray passage in opposite positions. The second ray through hole is larger than the first ray through hole, and the ray emitted by the bulb passes through the first ray through hole and the second ray through hole to irradiate on the detector.

Preferably, the drum also has a third radiation hole, and the radiation emitted by the radiation emitting device passes through the third radiation hole to irradiate the area of the patient to be treated.

Preferably, the drum also has at least two laser through holes, and the laser emitting device irradiates into the inside of the drum through the at least two laser through holes.

Preferably, the CT slip ring of the CT imaging device is fixedly connected to the end of the first end of the rotating gantry.

Preferably, the rotating frame further includes a slide rail bracket arranged along the longitudinal direction of the rotating frame, the arc-shaped slide rail is fixedly connected to one side of the slide rail bracket, and the second side of the ray emitting device The end is fixedly connected with a slider, and the slider cooperates with the arc-shaped slide rail so that the ray emitting device can reciprocate on the slide rail.

Preferably, the second end of the ray emitting device is provided with a nut seat, the second driving device is a motor screw, and the motor screw includes a servo motor with a reduction mechanism, a screw and a screw nut, the The lead screw nut is rotatably connected to the nut seat, and the servo motor is fixedly connected to the slide rail bracket.

Preferably, the slide rail bracket has an arc-shaped through hole, two slide rails are arranged on both sides of the arc-shaped through-hole, and the screw nut and the nut seat pass through the arc-shaped through-hole Rotatable connection.

Preferably, the ray emitting device at least includes a ray emitting device bracket and an accelerating tube of a medical electron linear accelerator, the accelerating tube is installed on the ray emitting device bracket, and the first end of the ray emitting device bracket The connecting piece is pivotally connected to the supporting frame of the radiation emitting device, and the nut is seated on the second end of the bracket of the radiation emitting device.

The technical effects and advantages of the present application: the CT imaging device and the radiotherapy ray emitting device are integrated equipment, therefore, after the CT imaging device completes image acquisition, there is no need to transfer to the radiotherapy ray emitting device for radiotherapy Therefore, the process of radiotherapy is relatively simple, and the treatment time is greatly shortened. At the same time, the CT imaging device provides image guidance for radiotherapy, which greatly reduces the error of radiotherapy, improves the treatment effect, and reduces the impact of radiotherapy on normal organs of the human body. , tissue and cell damage.

Description of drawings

Figure 1 is a schematic diagram of the structure of the application;

Figure 2 is a schematic diagram of the second structure of the application;

Figure 3 is a schematic diagram of the third structure of the application;

Fig. 4 is the structural representation of the rotating rack of the present application;

FIG. 5 is a schematic diagram of the intersection of the beam axis of the CT imaging device and the beam axis of the radiation emitting device of the present application.

Among the figure: 1-fixed frame, 11-frame base, 12-circular frame, 121-circular through hole, 13-support roller, 14-first driving device, 141-transmission chain, 15-system Moving device, 2-rotating frame, 21-ray launching device support frame, 22-curved slide rail, 23-rotating cylinder, 231-first ray through hole, 232-second ray through hole, 233-third ray Hole, 234-laser through hole, 24-first flange, 25-second flange, 26-slide rail bracket, 261-arc through hole, 262-fixed slide rail bracket, 263-movable slide rail bracket, 27 - Mounting plate, 3-CT imaging device, 31-ball tube, 32-detector, 33-CT slip ring, 4-ray emission device, 42-nut seat, 43-second driving device, 431-screw rod, 432 -Screw nut, 433-servo motor, 44-accelerator tube, 45-ray emitting device bracket, 46-magnetron, 5-bearing, 6-connector, A-CT imaging device beam axis, B-ray Emitter ray axis.

Detailed ways

In order to make the implementation of the technical means, creative features, goals and effects of the application easy to understand, the following will further elaborate the application in conjunction with specific illustrations. In the description of the application, it should be noted that unless otherwise specified and The terms "installation", "connection" and "connection" should be interpreted in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection or a mechanical connection, or an electrical connection; it can be It can be directly connected, or indirectly connected through an intermediary, and can be connected internally between two components.

The technical solution of the present application will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

A CT image-guided radiotherapy equipment as shown in Figures 1-5 includes a fixed frame 1, a rotating frame 2, a CT imaging device 3 and a radiation emitting device 4, wherein the fixed frame 1 includes a frame base Seat 11 and the ring frame 12 that is fixedly connected on the frame base 11, the first end of rotating frame 2 is located in the circular through hole 121 of ring frame 12 and passes bearing 5 and ring frame 12 Rotatably connected, the second end of the rotating frame 2 is supported by two support rollers 13 to make the rotating frame 2 more stable, and the first driving device 14 drives the rotating frame 2 to rotate along the first direction, and the rotating frame 2 rotates The axis coincides with the axis of the circular through hole 121 of the ring frame 12, the rotating frame 2 is provided with a radiation emitting device support frame 21 and an arc slide rail 22, and the CT imaging device 3 and the radiation emitting device 4 are arranged on the rotating frame 2, the first end of the ray emitting device 4 is pivotally connected to the ray emitting device support frame 21 through the connecting piece 6, and the second driving device 43 drives the ray emitting device 4 to reciprocate on the arc-shaped slide rail 22 along the second direction, Wherein, when the rotating gantry 2 and the ray emitting device 4 rotate simultaneously, the intersection position of the ray beam axis A of the CT imaging device 3 and the ray axis B of the ray emitting device 4 in the treatment space remains unchanged, which can reduce or Eliminate the secondary positioning error of the image positioning of the CT imaging device 3 and the treatment of the ray emitting device 4 .

Further, the rotating frame 2 comprises a tubular rotating drum 23, the first end of the rotating drum 23 is provided with a first flange 24, and the second end of the rotating drum 23 is provided with a second flange 25, on the first flange 24, Between the second flange 25 and the rotating cylinder 23 constitute a space where the CT imaging device 3 and the ray emitting device 4 can be installed, and the first flange 24 passes through the bearing 5 and the ring in the circular through hole 121 of the ring frame 12. Type frame 12 is rotatably connected, and the outer ring of bearing 5 is connected with the annular frame 12 of circular through hole 121 periphery, and the inner ring of bearing 5 is connected with the edge of first flange 24, in order to avoid the rotation of frame 2 The stress concentrates on the first flange 24, the support roller 13 fixedly connected to the frame base 11 supports the second flange 25 of the rotating frame 2, the treatment space is in the rotating drum 23, and the treated body is imaged by CT in the rotating drum 23 Under the guidance of the device 3, receive the treatment of the radiation emitting device 4.

Further, the first driving device 14 includes a driving servo motor and a speed reduction mechanism arranged in the frame base 11, and the output end of the driving servo motor drives the first flange 24 through the transmission chain 141 so that the rotating frame 2 rotates. The moving device 15 is fixedly connected to the frame base 11, and is used to apply an external force to the second flange 25 of the rotating frame 2 for braking. In this embodiment, the braking device 15 is a manual braking device. The mode of hand cranking makes two brake pads clamp the second flange 25 so that the rotating frame 2 stops rotating. In some embodiments, the braking device 15 may be an electric braking device.

Further, the CT imaging device 3 is a multi-row CT, and the function of the multi-row CT is to provide image guidance for radiotherapy equipment. The CT imaging device 3 includes a ball tube 31 and a detector 32 fixedly connected to the relative position on the rotating cylinder 23. The tube 23 has a relatively long and narrow first ray passage hole 231 and a long and narrow second ray passage hole 232, the second ray passage hole 232 is larger than the first ray passage hole 231, and the rays emitted by the bulb 31 pass through the first ray passage. The aperture 231 , the treatment volume and the second beam passage 232 are irradiated onto the detector 32 . The drum 23 also has a third radiation hole 233 through which the radiation emitted by the radiation emitting device 4 passes through the third radiation hole 233 to irradiate the treatment space. The drum 23 also has at least two laser holes 234 through which a laser emitting device (not shown) irradiates into the drum 23 to provide auxiliary positioning for radiotherapy. The CT slip ring 33 of the CT imaging device 3 is fixedly connected to the end of the first end of the rotating frame 2. In this embodiment, the CT slip ring 33 is connected to the end of the first end of the rotating cylinder 23. In some other implementations In an example, the CT slip ring 33 may also be connected to the end surface of the first flange 24 .

Further, the rotating frame 2 also includes a sliding rail bracket 26 arranged longitudinally along the rotating frame 2, the arc-shaped sliding rail 22 is fixedly connected to the side of the sliding rail bracket 26 facing the radiation emitting device 4, and the first side of the radiation emitting device 4 The two ends are fixedly connected to a slider (not shown), the slider cooperates with the arc-shaped slide rail 22, and the ray emitting device 4 reciprocates along the second direction on the slide rail, and the second end of the ray emitting device 4 is provided with a nut seat 42 , the second driving device 43 is a motor screw, the motor screw includes a servo motor 433, a screw 431 and a screw nut 432, the screw nut 432 is rotatably connected to the nut seat 42, and the servo motor 433 drives the screw 431 in the screw. The lever nut 432 rotates inside, and the servo motor 433 is fixedly connected to the slide rail bracket 26 . The slide rail bracket 26 has a long and narrow arc-shaped through hole 261, two arc-shaped slide rails 22 are located on both sides of the arc-shaped through-hole 261, and the lead screw nut 432 and the nut seat 42 are rotatably connected through the arc-shaped through-hole 261. . The ray emitting device 4 at least comprises the accelerating tube 44 of the ray emitting device bracket 45 and the medical electron linear accelerator, the accelerating tube 44 is installed on the ray emitting device bracket 45, and the first end of the ray emitting device bracket 45 is connected to the The supporting frame 21 of the radiation emitting device is pivotally connected, and the nut seat 42 is arranged on the second end of the bracket 45 of the radiation emitting device. In the embodiment, the components of the medical electron linear accelerator, the magnetron 46 and the circulation tube (not shown), are installed on the beam emitting device bracket 45 .

In this embodiment, the slide rail bracket 26 includes two fixed slide rail brackets 262 and a movable slide rail bracket 263, the arc through hole 261 and the arc slide rail 22 are arranged on the movable slide rail bracket 263, and the two fixed slide rails The bracket 262 is fixedly connected with the first flange 24, the second flange 25 and the drum 23 respectively, and the movable slide rail bracket 263 is detachably connected with the two fixed slide rail brackets 262. In some embodiments, the slide rail bracket 26 It can be fixedly connected or detachably connected with the first flange 24 , the second flange 25 and the drum 23 as a whole.

In this embodiment, the rotating frame 2 is also provided with a plurality of mounting plates 27 for fixing and installing the components of the CT imaging device 3 and the components of the medical electron linear accelerator except the accelerating tube 44 , the magnetron 46 and the circulating tube.

Finally, it should be noted that: the above is only a preferred embodiment of the application, and is not intended to limit the application. Although the application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it can still Modifications to the technical solutions recorded in the foregoing embodiments, or equivalent replacements for some of the technical features, within the spirit and principles of this application, any modifications, equivalent replacements, improvements, etc., shall be included in this document. within the scope of the application.

Claims

A CT image-guided radiotherapy device, characterized in that it comprises:

A fixed frame, including a frame base and a ring frame fixedly connected to the frame base;

The rotating frame, the first end is arranged in the circular through hole of the ring frame and is rotatably connected with the ring frame through bearings, the second end is supported by supporting rollers, and the first driving device drives the rotating frame Rotating along the first direction, the rotating frame is provided with a ray emitting device support frame and an arc slide rail;

A CT imaging device is arranged on the rotating gantry; and

The radiation emitting device is arranged on the rotating frame, the first end is pivotally connected to the support frame of the radiation emitting device through a connecting piece, and the second driving device drives the radiation emitting device to reciprocate in a second direction;

Wherein, when the rotatable gantry and the radiation emitting device rotate simultaneously, the position of the intersection of the radiation beam axis of the CT imaging device and the radiation axis of the radiation emitting device in the treatment space remains unchanged.
According to claim 1, the CT image-guided radiotherapy equipment is characterized in that: the rotating frame comprises a tubular rotating drum, the first end of the rotating drum is provided with a first flange, and the first end of the rotating drum The two ends are provided with a second flange, and the first flange is rotatably connected with the ring frame through a bearing in the circular through hole of the ring frame, and the treatment space is in the rotating cylinder. Inside.
The CT image-guided radiotherapy equipment according to claim 2, further comprising support rollers fixedly connected to the frame base, and the support rollers support the second flange of the rotating frame.
According to claim 2, the CT image-guided radiotherapy equipment is characterized in that: the first driving device includes a driving servo motor and a reduction mechanism arranged in the frame base, and the driving servo motor is connected to the A deceleration mechanism, the output end of the deceleration mechanism drives the first flange through a transmission chain to rotate the rotating frame.
According to claim 2, the CT image-guided radiotherapy equipment is characterized in that: the CT imaging device includes a ball tube and a detector fixedly connected to the opposite position on the rotating drum, and the rotating drum has opposite A long and narrow first ray through hole and a long and narrow second ray through hole, the second ray through hole is larger than the first ray through hole, the ray emitted by the ball tube passes through the first ray through hole and the second ray through hole A through hole shines onto the detector.
According to the CT image-guided radiotherapy equipment according to claim 5, it is characterized in that: the drum also has a third ray hole, and the ray emitted by the ray emitting device passes through the third ray hole to irradiate the area of the patient to be treated .
According to the CT image-guided radiotherapy equipment according to claim 6, it is characterized in that: the drum also has at least two laser through holes, and the laser emitting device irradiates the drum through the at least two laser through holes internal.
The CT image-guided radiotherapy equipment according to claim 1, characterized in that: the CT slip ring of the CT imaging device is fixedly connected to the end of the first end of the rotating gantry.
According to the CT image-guided radiotherapy equipment according to claim 2, it is characterized in that: the rotating frame further includes a slide rail support arranged along the longitudinal direction of the rotating frame, and the arc-shaped sliding rail is fixedly connected to the One side of the slide rail bracket, the second end of the ray emitting device is fixedly connected to a slider, and the slider is matched with the arc-shaped slide rail so that the ray emitting device can reciprocate on the slide rail .
According to claim 9, the CT image-guided radiotherapy equipment is characterized in that: the second end of the radiation emitting device is provided with a nut seat, and the second driving device is a motor screw, and the motor screw includes a A servo motor, a lead screw and a lead screw nut of the reduction mechanism, the lead screw nut is rotatably connected to the nut seat, and the servo motor is fixedly connected to the slide rail bracket.
According to claim 10, the CT image-guided radiotherapy equipment is characterized in that: the slide rail bracket has an arc-shaped through hole, and the two arc-shaped slide rails are arranged on both sides of the arc-shaped through hole, so that The screw nut is rotatably connected to the nut seat through the arc-shaped through hole.
According to claim 11, the CT image-guided radiotherapy equipment is characterized in that: the radiation emitting device at least includes a radiation emitting device bracket and an accelerating tube of a medical electron linear accelerator, and the accelerating tube is installed on the radiation emitting device On the bracket, the first end of the radiation emitting device bracket is pivotally connected to the radiation emitting device support frame through a connecting piece, and the nut is seated on the second end of the radiation emitting device bracket.