# US 8,772,742 B2 · Radiation therapy system and method for adapting an irradiation field

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- Number: US 8,772,742 B2
- Document ID: US8772742B2
- Status: Granted
- Kind: B2
- Application number: 11/899,805
- Filed: 2007-09-07
- Published: 2008-03-20
- Granted: 2014-07-08
- Earliest claimed: 2006-09-15
- Assignees: Siemens Aktiengesellschaft
- Applicants: Eike Rietzel
- Inventors: Eike Rietzel
- Web page: https://patentgrep.com/patent/US8772742B2

## CPC

- A61N 5/1071: {for verifying the dose delivered by the treatment plan}
- A61N 5/103: {Treatment planning systems}
- A61N 5/1043: {Scanning the radiation beam, e.g. spot scanning or raster scanning}
- A61N 5/1048: {Monitoring, verifying, controlling systems and methods}
- A61N 5/1037: {taking into account the movement of the target, e.g. 4D-image based planning}
- A61N 2005/1087: {Ions; Protons}
- A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B)

## Abstract

A radiation therapy system for irradiating a target volume with a particle beam is provided. The radiation therapy system includes a radiation source that is operable to output an adjustable irradiation field that includes a particle beam that is scanned point by point over the target volume. A 3D imaging device may obtain a 3D radiation treatment data set in a radiation treatment phase. An adaptation unit adapts the irradiation field to a change in position and/or shape of the target volume in the radiation treatment phase. The adaptation unit compares the 3D radiation treatment data set with a 3D planning image data set furnished and obtains a transformation that describes the change in position and/or shape of the target volume. The adaptation unit transforms an irradiation field based on the transformation.

## Claims

### Claim 1

A method for adapting an irradiation field for a radiation treatment procedure on a target volume that is irradiated with a particle beam by scanning a particle beam point by point over the target volume, a position of the target volume, a shape of the target volume, or the position and the shape of the target volume being changeable over time, the method comprising:
obtaining a three-dimensional (3D) planning image data set and the irradiation field, which have been planned by the association of doses to be applied successively with volume elements of the target volume on the basis of the 3D planning image data set,
obtaining a 3D radiation treatment data set in a radiation treatment phase, the 3D radiation treatment data set reproducing the target volume to be irradiated,
registering the target volume in the 3D planning image data set and the 3D radiation treatment data set to obtain a transformation that describes a change in position, shape, or position and shape of the target volume, and
adapting, as a function of the transformation, the irradiation field from the planning to the target volume in the radiation treatment phase,
wherein a three-dimensional position of the doses to be successively applied is transformed as a function of the transformation.

### Claim 2 (depends on 1)

The method as defined by claim 1, comprising verifying or adapting doses of the irradiation field as a function of a density distribution in the 3D radiation treatment data set in an inlet conduit.

### Claim 3 (depends on 1)

The method as defined by claim 1, comprising regularizing the irradiation field as a function of the change in position, shape, or position and shape of the target volume.

### Claim 4 (depends on 3)

The method as defined by claim 3, wherein regularizing comprises interpolating the irradiation field to a predetermined radiation treatment grid.

### Claim 5 (depends on 1)

The method as defined by claim 1, wherein the registering is manual, partly automated, or automated.

### Claim 6 (depends on 1)

The method as defined by claim 1, wherein transformation includes a translation, rotation, scaling, shearing, deformation, or a combination thereof.

### Claim 7 (depends on 1)

The method as defined by claim 1, comprising adapting an irradiation direction to a change in position, shape, or position and shape of a surrounding volume that surrounds the target volume.

### Claim 8 (depends on 1)

The method as defined by claim 1, comprising generating a warning signal when the change in position, shape, or position and shape of the target volume exceeds a limit value,
wherein adapting is performed after disabling the warning signal.