# US 2010/0166145 A1 · Radiotherapy system

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- Number: US 2010/0166145 A1
- Document ID: US20100166145A1
- Status: Published application
- Kind: A1
- Application number: 12/644,251
- Filed: 2009-12-22
- Published: 2010-07-01
- Earliest claimed: 2008-12-26
- Assignees: Hitachi, Ltd.
- Inventors: Toru UMEKAWA; Yoshihiko NAGAMINE; Toshie SASAKI; Takao KIDANI; Hiroshi AKIYAMA
- Web page: https://patentgrep.com/patent/US20100166145A1

## CPC

- A61N 5/1049: {for verifying the position of the patient with respect to the radiation beam}
- A61B 6/541: {involving acquisition triggered by a physiological signal}
- A61B 5/113: occurring during breathing
- A61N 5/1037: {taking into account the movement of the target, e.g. 4D-image based planning}
- A61N 5/1064: {for adjusting radiation treatment in response to monitoring}
- A61N 5/1068: {Gating the beam as a function of a physiological signal}
- A61N 2005/1061: {using an x-ray imaging system having a separate imaging source}
- 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)
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

A radiotherapy system achieves highly-accurate respiratory-gated irradiation with less x-ray exposure by performing x-ray imaging only during the respiratory phases that are necessary for the respiratory-gated irradiation. An external respiration monitor 300 externally monitors an external respiratory index of a patient. An x-ray source 200 and an x-ray detector 210, or internal-respiration observation devices, acquire x-ray images of the patient and monitor an internal respiratory index of the patient using the positions of internal body structures indicated by the acquired x-ray images. An x-ray imaging gating device 310 gates the x-ray imaging performed by the internal-respiration observation devices with the use of the external respiratory index such that the x-ray imaging is performed while the external respiratory index is within a predetermined range. An irradiation gating device 410 gates the irradiation of a treatment beam with the use of the internal respiratory index.

## Claims

### Claim 1

A radiotherapy system comprising:
external-respiration observation means for externally monitoring an external respiratory index of a patient;
internal-respiration observation means for acquiring x-ray images of the patient and monitoring an internal respiratory index of the patient using the positions of internal body structures indicated by the acquired x-ray images;
imaging gating means for gating the x-ray imaging performed by the internal-respiration observation means with the use of the external respiratory index monitored by the external-respiration observation means such that the x-ray imaging is performed while the external respiratory index is within a predetermined range; and
beam irradiation gating means for gating the irradiation of a treatment beam with the use of the internal respiratory index monitored by the internal-respiration observation means.

### Claim 2 (depends on 1)

The radiotherapy system defined in claim 1, wherein the internal-respiration observation means includes x-ray imaging control means for instructing the internal-respiration observation means to stop the x-ray imaging when a gating signal permitting treatment-beam irradiation which is generated by the beam irradiation gating means is turned off.

### Claim 3 (depends on 1)

The radiotherapy system defined in claim 1, wherein the internal-respiration observation means includes x-ray imaging control means for permitting the internal-respiration observation means to perform the x-ray imaging while a treatment beam can be radiated.

### Claim 4 (depends on 1)

The radiotherapy system defined in claim 1, wherein the internal-respiration observation means includes x-ray imaging control means for permitting the internal-respiration observation means to perform the x-ray imaging prior to a period during which a treatment beam can be radiated.

### Claim 5 (depends on 1)

The radiotherapy system defined in claim 1, wherein the beam irradiation gating means stores a condition for radiating a treatment beam so that the beam irradiation gating means can use the condition for later treatments.