CN210057184U

CN210057184U - In-situ CT device integrated into fixed particle beam radiotherapy room

Info

Publication number: CN210057184U
Application number: CN201920449016.9U
Authority: CN
Inventors: 李凯若
Original assignee: Newrt Medical Systems Wuxi Co ltd
Current assignee: Newrt Medical Systems Wuxi Co ltd
Priority date: 2018-04-04
Filing date: 2019-04-03
Publication date: 2020-02-14
Anticipated expiration: 2029-04-03
Also published as: CN109806512A; CN108478938A

Abstract

The utility model relates to an integrated normal position CT device to fixed particle beam radiotherapy room, including fixed radiotherapy head that sets up in the radiotherapy room, set up radiotherapy indoor rotatory radiotherapy chair, its characterized in that: a CT device is also arranged in the radiotherapy chamber; the X-ray tube and the CT detector of the CT device are fixedly arranged or arranged on a CT rotating ring frame which rotates around the rotating shaft of the radiotherapy chair; the isocenter of the ray of the CT device is superposed with the isocenter of the emergent ray beam of the radiotherapy head. By integrating the CT to the treatment isocenter to form the in-situ CT, the position of the tumor body can be directly verified, and high-precision tumor positioning is realized.

Description

In-situ CT device integrated into fixed particle beam radiotherapy room

Technical Field

The utility model belongs to the technical field of the medical equipment technique and specifically relates to an integrated normal position CT device to fixed particle beam radiotherapy room.

Background

In the equipment for treating cancer by particle radiation, in order to realize that the radiation beam irradiates the cancer of a patient from a plurality of angles, the dose on a tumor target is accumulated to a required high level, the dose on the surrounding normal tissues can be kept to a low level due to scattered irradiation, so that the normal tissues are not damaged, generally, the patient is vertically fixed on a rotary radiotherapy chair, and the fixed particle radiation beam can irradiate the cancer part of the patient from a plurality of angles by the rotation of the radiotherapy chair. Prior to such radiation therapy, the patient is subjected to positioning (i.e., the precise placement of the tumor to be treated at the treatment site) and verification of the location. Typically, verification of position is achieved using helical CT, or Cone Beam CT (CBCT), or orthogonal X-ray photography in the treatment room. If a spiral CT is used in the treatment room, the patient is typically transported to the treatment site after verification by a robotic arm or by a large elevator. Or a large amplitude helical CT, which is positioned at the isocenter of the therapeutic particle beam. This large, long distance movement is difficult to ensure with the accuracy of positioning. When the CBCT or the orthogonal X-ray photography is used for verification, the existing CBCT image or the orthogonal X-ray photography image cannot clearly distinguish the boundary of soft tissue and tumor, the positioning verification is realized by bone features or implanted markers, and the positioning precision of the tumor is limited because the soft tissue and the tumor move relative to the bone due to organ motion.

SUMMERY OF THE UTILITY MODEL

The applicant provides an in-situ CT apparatus integrated into a fixed particle beam radiotherapy room, aiming at the disadvantages of the prior art, so as to directly perform position verification on a tumor body, monitor the change of the tumor in a treatment course in situ, and implement in-situ radiotherapy planning and re-radiotherapy planning when the tumor changes greatly.

The utility model discloses the technical scheme who adopts as follows:

the utility model provides an integrated normal position CT device to fixed particle beam radiotherapy room, is in including the fixed radiotherapy head that sets up in the radiotherapy room, setting the radiotherapy chair of rotatory in the radiotherapy room which characterized in that: a CT device is also arranged in the radiotherapy chamber; the X-ray tube and the CT detector of the CT device are fixedly arranged or arranged on a CT rotating ring frame which rotates around the rotating shaft of the radiotherapy chair; the isocenter of the ray of the CT device is superposed with the isocenter of the emergent ray beam of the radiotherapy head.

The further technical scheme is as follows: the physical width of the CT detector is more than 10 cm.

Further: the CT detector is a detector with 16-320 rows.

An X-ray tube of the form: the X-ray tube comprises a cathode and an anode; the anode is in a strip shape, an arc shape or a polygon shape along the longitudinal direction of the human body; and an electromagnetic control device is arranged between the cathode and the anode and is used for controlling the electron beam emitted by the cathode to be rapidly focused to different positions of the anode through an electromagnetic field.

The anode is connected to the housing of the X-ray tube and the anode is directly cooled by a liquid or liquid metal.

A CT working mode comprises the following steps: : the CT detector reciprocates along the longitudinal direction of the human body.

In another mode: the X-ray tube reciprocates in the longitudinal direction of the human body.

There is also a method: the CT rotating ring frame is vertically reciprocated and translated along the rotating shaft direction of the radiotherapy chair.

There is also a method: the CT rotating ring frame rotates around the rotating shaft of the radiotherapy chair.

The utility model has the advantages as follows:

the utility model discloses compact structure, reasonable, convenient operation forms normal position CT on the isocenter point of treatment through integrated CT, can directly carry out the position verification to the tumour body, realizes the tumour of high accuracy and puts. And the tumor image of the spiral CT is clear, and the spiral CT can be used for in-situ monitoring of the change of the tumor in the treatment course. And the radiotherapy plan can be made in situ and can be made again when the tumor is changed greatly. The utility model discloses X-ray tube special design for along human fore-and-aft visual field very wide, can just cover most of tumors and human organs at radiotherapy chair round of rotation.

Drawings

Fig. 1 is a schematic top sectional view of the present embodiment 1.

Fig. 2 is a schematic side sectional view of the embodiment 1.

Fig. 3 is a schematic top sectional view of the present embodiment 2.

Fig. 4 is a schematic side sectional view of the embodiment 2.

Fig. 5 is a schematic top sectional view of the present embodiment 3.

Fig. 6 is a schematic side sectional view of the present embodiment 3.

Wherein: 1. the direction of rotation; 2. a radiotherapy head; 3. emitting a therapeutic beam; 4. an isocenter; 5. an X-ray tube; 6. x-rays; 7. a CT detector; 8. a CT detector collimator plate; 9. a human body; 10. a radiotherapy chair; 11. an anode; 12. a cathode; 13. an electron beam; 14. an electromagnetic control device; 15. an X-ray tube housing; 16. a cooler; 17. a coolant tube; 18. and (4) a CT rotating ring frame.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

The first embodiment is as follows:

as shown in fig. 1 and 2, an in-situ CT apparatus integrated into a fixed particle beam radiotherapy room includes a radiotherapy head 2 fixedly disposed in the radiotherapy room, and a radiotherapy chair 10 disposed in the radiotherapy room and rotating in a rotation direction 1. A CT device is also arranged in the radiotherapy chamber; the CT apparatus includes an X-ray tube 5 and a CT detector 7; the CT detector 7 is a detector with 16-320 rows, and a CT detector collimator plate 8 is arranged on the CT detector. The X-ray tube 5 and the CT detector 7 are respectively arranged at two opposite sides, and X-rays 6 emitted from the focus of an anode 11 of the X-ray tube 5 are received by the CT detector 7. The isocenter 4 of the X-rays 6 of the CT apparatus coincides with the isocenter 4 of the therapeutic radiation beam 3 emitted by the radiotherapy head 2. By rotating the radiotherapy chair 10, the in-situ scanning of the CT can be realized.

If 16 rows of detectors are selected, one or half of a revolution of the chair 10 can reconstruct a 16 row CT image. The field of view of this image at the location of the isocenter 4 in the longitudinal direction of the body 9 is, however, only as wide as 16 rows, approximately 0.8-1.2 cm. This is not enough to visualize most large tumors. If the CT detectors 7 are increased to 256 to 320 rows, a fan-shaped beam with a large angle is formed, so that the width of the field of view in the longitudinal direction of the body 9 at the location of the isocenter 4 can be extended to more than 16 cm. CT images larger than 16cm in the longitudinal direction of the body 9 can be reconstructed, covering most large tumors and organs. But 256 or more rows of CT detectors are very expensive.

Example two:

referring to fig. 3 and 4, an in-situ CT apparatus integrated into a fixed particle beam radiotherapy room improved based on embodiment 1 includes a radiotherapy head 2 fixedly disposed in the radiotherapy room, and a radiotherapy chair 10 disposed in the radiotherapy room and rotating in a rotation direction 1. A CT device is also arranged in the radiotherapy chamber and comprises an X-ray tube 5 and a CT detector 7; the X-ray tube 5 and the CT detector 7 are disposed on opposite sides, respectively. The CT detector 7 is a detector with 16-320 rows, and a CT detector collimator plate 8 is arranged on the CT detector. The isocenter 4 of the X-rays 6 of the CT apparatus coincides with the isocenter 4 of the therapeutic radiation beam 3 emitted by the radiotherapy head 2. The X-ray tube 5 includes a cathode 12, an anode 11; the anode 11 is in a strip shape, an arc shape or a polygon shape along the longitudinal direction of the human body 9; an electromagnetic control device 14 is arranged between the cathode 12 and the anode 11 for rapidly focusing the electron beam 13 emitted by the cathode 12 to different positions of the anode 11 by electromagnetic field control.

If 16 rows of detectors are chosen, the principle is that the focal exposure on each anode 11 can cover 16 rows of CT detectors 7, i.e. a field width of 0.8-1.2 cm. As the focus of the X-ray tube 5 is moved longitudinally along the body 9 to the next position at the anode 11, the new exposure can in turn cover another 0.8-1.2cm field width of the body 9. In this way, the position of 20 or more foci can be extended to a field width of 16cm, covering most tumors and organs. The movement of the focal point is controlled by the electromagnetic control device 14, and can be moved to and fro very quickly, which is commonly called flying focal point in CT equipment. Therefore, in the process of slowly rotating the radiotherapy chair 10, the focus rapidly reciprocates to form multi-focus exposure at different longitudinal angles, and the field width is expanded. Thereby realizing that the radiotherapy chair 10 rotates for one circle or a half circle, and the CT image with the field width increased along the longitudinal direction of the human body 9 can be reconstructed. The anode 11 and the X-ray tube housing 15 are joined together so that cooling liquid can be introduced directly from the back of the anode 11 through the cooling liquid pipe 17 from the cooler 16 into the anode 11 and rapidly cool the anode 11. Multiple intermittent exposures at a certain focal position contribute to heat dissipation of the anode 11.

Example three:

as shown in fig. 5 and 6, another form of in-situ CT apparatus integrated into a fixed particle beam radiotherapy room includes a radiotherapy head 2 fixedly disposed in the radiotherapy room, a radiotherapy chair 10 and a CT apparatus disposed in the radiotherapy room to rotate in a rotation direction 1. The CT device is arranged on a CT rotating ring frame 18 which rotates around the rotating shaft of the radiotherapy chair 10; the CT detector 7 is a detector with 16-320 rows, and a CT detector collimator plate 8 is arranged on the CT detector. The isocenter 4 of the X-rays 6 of the CT apparatus coincides with the isocenter 4 of the therapeutic radiation beam 3 emitted by the radiotherapy head 2. The CT device comprises an X-ray tube 5 and 16-320 rows of CT detectors 7; the X-ray tube 5 and the CT detector 7 are respectively disposed on opposite sides of the CT rotating gantry 18. The CT rotating gantry 18 rotates around the radiotherapy chair 10 axis of rotation. The CT rotating gantry 18 axis of rotation 100 passes through the isocenter 4, resulting in a CT scan, through the rapid rotation of the CT detector 7 and corresponding X-ray tube 5 along with the CT rotating gantry 18. And reconstructing a CT image.

The above description is for the purpose of explanation and not limitation of the invention, which is defined in the claims, and any modifications may be made within the scope of the invention.

Claims

1. The utility model provides an integrated normal position CT device to fixed particle beam radiotherapy room, is in including the fixed radiotherapy head that sets up in the radiotherapy room, setting the radiotherapy chair of rotatory in the radiotherapy room which characterized in that: a CT device is also arranged in the radiotherapy chamber; the X-ray tube and the CT detector of the CT device are fixedly arranged on the CT rotating ring frame; the isocenter of the X-ray of the CT device is superposed with the isocenter of the treatment ray beam emitted by the radiotherapy head.

2. The in-situ CT apparatus integrated into a fixed particle beam radiotherapy room of claim 1, wherein: the physical width of the CT detector is more than 10 cm.

3. The in-situ CT apparatus integrated into a fixed particle beam radiotherapy room of claim 2, wherein: the CT detector is a detector with 16-320 rows.

4. An in-situ CT apparatus integrated into a fixed particle beam radiotherapy room as claimed in any one of claims 1 to 3, wherein: the X-ray tube comprises a cathode and an anode; the anode is in a strip shape, an arc shape or a polygon shape along the longitudinal direction of the human body; an electromagnetic control device is arranged between the cathode and the anode and is used for controlling the electron beam emitted by the cathode to be rapidly focused to different positions of the anode through an electromagnetic field; the anode is connected to the housing of the X-ray tube and the anode is directly cooled by a liquid or liquid metal.

5. An in-situ CT apparatus integrated into a fixed particle beam radiotherapy room as claimed in any one of claims 1 to 3, wherein: the CT detector reciprocates along the longitudinal direction of the human body.

6. An in-situ CT apparatus integrated into a fixed particle beam radiotherapy room as claimed in any one of claims 1 to 3, wherein: the X-ray tube reciprocates in the longitudinal direction of the human body.

7. An in-situ CT apparatus integrated into a fixed particle beam radiotherapy room as claimed in any one of claims 1 to 3, wherein: the CT rotating ring frame is vertically reciprocated and translated along the rotating shaft direction of the radiotherapy chair.

8. An in-situ CT apparatus integrated into a fixed particle beam radiotherapy room as claimed in any one of claims 1 to 3, wherein: the CT rotating ring frame rotates around the rotating shaft of the radiotherapy chair.