Radiotherapy system

Patent metadata

Field	Value
Publication number	US-12576288-B2
Application number	US-202318446852-A
Country	US
Kind code	B2
Filing date	Aug 9, 2023
Priority date	Feb 9, 2021
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

The present disclosure provides a radiotherapy system, including a treatment couch, a gantry, a treatment head coupled to the gantry, and a control mechanism. The control mechanism is configured to control the gantry to rotate, and synchronously control the treatment couch to move along an axial direction of the gantry; and the treatment head includes a multi-leaf collimator, the multi-leaf collimator being configured so that leaves are capable of stopping at any position along a movement path to form radiation fields of various shapes.

First claim

What is claimed is:

1 . A radiotherapy system, comprising: a treatment couch, a gantry, a treatment head coupled to the gantry, and a control mechanism; wherein the control mechanism is configured to control the gantry to rotate, and synchronously control the treatment couch to move along an axial direction of the gantry; and
the treatment head comprises a radiation source, a precollimator, and a multi-leaf collimator, the multi-leaf collimator being configured so that leaves are capable of stopping at any position along a movement path to form radiation fields of various shapes, wherein the multi-leaf collimator comprises a first leaf bank and a second leaf bank which are oppositely disposed, leaves of both leaf banks being moveable along a direction parallel to an axis of the gantry.

2 . The radiotherapy system according to claim 1 , wherein the multi-leaf collimator comprises: a plurality of leaf groups disposed along a beam direction, wherein at least one leaf group comprises the first leaf bank and the second leaf bank which are oppositely disposed.

3 . The radiotherapy system according to claim 1 , wherein maximum moving distances of the leaves of the first leaf bank and the second leaf bank range from 5 cm to 15 cm.

4 . The radiotherapy system according to claim 1 , wherein length directions of the leaves of the first leaf bank and the second leaf bank are parallel to the axial direction of the gantry;
lengths of the leaves of the first leaf bank and the second leaf bank range from 2.5 cm to 7.5 cm; and heights of the leaves of the first leaf bank and the second leaf bank range from 6 cm to 8 cm.

5 . The radiotherapy system according to claim 1 , wherein opposite front ends of the leaves of the first leaf bank and the second leaf bank are both provided with an arc structure;
radians of the front ends of the leaves of the first leaf bank and the second leaf bank are inversely proportional to thicknesses of corresponding leaves; or, radians of the front ends of the leaves of the first leaf bank and the second leaf bank are directly proportional to distances between the corresponding leaves and an isocenter of the radiotherapy system; or, radians of the front ends of the leaves of the first leaf bank and the second leaf bank are directly proportional to maximum moving distances of the corresponding leaves.

6 . The radiotherapy system according to claim 1 , wherein a radiation field projected by the precollimator at an isocenter of the radiotherapy system is non-circular.

7 . The radiotherapy system according to claim 6 , wherein the precollimator comprises a precollimator body and a pre-collimating hole provided on the precollimator body; wherein
the pre-collimating hole is a square truncated pyramid-shaped through hole, and the pre-collimating hole intersects a first surface and a second surface opposite to each other of the precollimator body.

8 . The radiotherapy system according to claim 1 , wherein a shape of a radiation field projected by the precollimator at an isocenter of the radiotherapy system is elongated, wherein a direction of a short side of the radiation field is along the axial direction of the gantry of the radiotherapy system.

9 . The radiotherapy system according to claim 8 , wherein
a length of the short side of the radiation field ranges from 5 cm to 15 cm; and/or, a length of a long side of the radiation field ranges from 30 cm to 50 cm.

10 . The radiotherapy system according to claim 7 , wherein a size of a short side of the pre-collimating hole is adjustable.

11 . The radiotherapy system according to claim 1 , wherein the control mechanism is configured to receive a treatment plan and, based on the treatment plan, control the treatment couch, the gantry, the radiation source, and the multi-leaf collimator.

12 . The radiotherapy system according to claim 1 , wherein the treatment head further comprises: a tungsten door; and
the control mechanism is configured to control at least two of the treatment couch, the gantry, the radiation source, the precollimator, the multi-leaf collimator, and the tungsten door.

13 . The radiotherapy system according to claim 1 , wherein the control mechanism is configured to enable the gantry, the treatment couch, the multi-leaf collimator, and the radiation source to cooperate to achieve intensity-modulated irradiation.

14 . The radiotherapy system according to claim 13 , wherein the control mechanism is configured to control a rotating speed of the gantry, a speed of the treatment couch, a position of a leaf in the multi-leaf collimator, or a dose rate of the radiation source, so as to perform intensity modulation on a target volume.

15 . The radiotherapy system according to claim 1 , wherein the control mechanism is configured to control the gantry to rotate, the treatment couch to move along the axial direction of the gantry, and the leaf of the multi-leaf collimator to move during an emitting process of a radiation beam by the radiation source.

16 . The radiotherapy system according to claim 1 , wherein the control mechanism is configured to control the gantry to rotate to a specific angle, control the treatment couch to move, along the axial direction of the gantry, to a specific position, control the leaves of the multi-leaf collimator to conform to a radiation field with a specific shape, and control the radiation source to emit a radiation beam.

17 . The radiotherapy system according to claim 13 , wherein the control mechanism is configured to
control a moving speed, a moving direction, and a moving distance of the treatment couch; and/or control a rotating speed, a rotating direction, and a rotating angle of the gantry; and/or control a radiation dose of the radiation beam emitted by the radiation source; and/or control moving speeds and moving distances of the leaves of the first leaf bank and/or the second leaf bank.

18 . The radiotherapy system according to claim 1 , wherein the radiotherapy system further comprises a first imaging assembly disposed oppositely to the treatment head and configured to acquire first image data based on a radiation beam from the treatment head, the first image data being configured for radiation field imaging or dose verification.

19 . The radiotherapy system according to claim 1 , wherein the radiotherapy system further comprises a second imaging assembly, wherein the second imaging assembly comprises a bulb tube and a flat panel detector that are oppositely disposed, the bulb tube being configured to emit X-rays, and the flat panel detector being configured to detect the X-rays and generate second image data, the second image data being configured to image a tumor of a patient.

Assignees

• Our United Corp

Inventors

• Li Jinsheng

Classifications

• A61N5/1045 Primary

  using a multi-leaf collimator, e.g. for intensity modulated radiation therapy or IMRT · CPC title

• A61N5/1071

  for verifying the dose delivered by the treatment plan · CPC title

• A61N2005/1095

  Elements inserted into the radiation path within the system, e.g. filters or wedges · CPC title

• G21K1/046

  varying the contour of the field, e.g. multileaf collimators · CPC title

• A61N5/1081 Primary

  Rotating beam systems with a specific mechanical construction, e.g. gantries · CPC title