# US 11,114,269 B2 · Bremsstrahlung target for radiation therapy system

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- Number: US 11,114,269 B2
- Document ID: US11114269B2
- Status: Granted
- Kind: B2
- Application number: 16/827,932
- Filed: 2020-03-24
- Published: 2020-07-09
- Granted: 2021-09-07
- Earliest claimed: 2015-10-09
- Assignees: Accuray Incorporated
- Applicants: Accuray Incorporated
- Inventors: Kirk Joseph Bertsche; Giorgio Asmerom; Miguel Gutierrez
- Web page: https://patentgrep.com/patent/US11114269B2

## CPC

- H01J 35/08: Anodes; Anti cathodes
- H01J 35/186: {used as targets or X-ray converters}
- A61B 6/022: {Stereoscopic imaging}
- A61B 6/4435: {the source unit and the detector unit being coupled by a rigid structure}
- A61B 6/4458: {the source unit or the detector unit being attached to robotic arms}
- A61B 6/50: specially adapted for specific body parts; specially adapted for specific clinical applications
- A61N 5/1081: {Rotating beam systems with a specific mechanical construction, e.g. gantries}
- A61N 5/1083: {Robot arm beam systems}
- A61N 2005/1089: {Electrons}
- H01J 35/116: {Transmissive anodes (acting as a window H01J35/186)}
- H01J 2235/081: Target material
- H01J 2235/086: Target geometry
- H01J 2235/1204: of the anode
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- 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

Described herein is a medical linear accelerator including an accelerator target structure constructed of a material having a thickness of less than 0.2 radiation lengths, and an accelerator structure to receive an electromagnetic wave and generate an output therapy dose rate of electrons having a beam energy between 4-25 mega-electronvolts (MeV).

## Claims

### Claim 1

A medical linear accelerator comprising:
an electromagnetic wave source to receive a beam current of electrons and to generate an electromagnetic wave;
an accelerator structure to receive the electromagnetic wave and to generate an output therapy dose rate of electrons having a beam energy between 4-25 mega-electronvolts (MeV), wherein the accelerator is a standing wave accelerator; and
an accelerator target structure to receive the output dose of electrons comprised of:
an x-ray emitting target to emit x-rays in response to receiving the output dose rate of electrons, wherein the x-ray emitting target is less than 0.2 radiation lengths.

### Claim 2 (depends on 1)

The medical linear accelerator of claim 1, wherein the thickness of the x-ray emitting target is between 0.01 and 0.2 radiation lengths.

### Claim 3 (depends on 1)

The medical linear accelerator of claim 1, wherein the accelerator is coupled to a robotic arm.

### Claim 4 (depends on 1)

The medical linear accelerator of claim 1, wherein the accelerator is coupled to a gantry.

### Claim 5 (depends on 1)

The medical linear accelerator of claim 1, wherein the standing wave accelerator is an X-Band, C-Band, S-Band or L-Band linear accelerator.

### Claim 6 (depends on 1)

The medical linear accelerator of claim 1, wherein the electromagnetic wave source is a magnetron.

### Claim 7 (depends on 1)

The medical linear accelerator of claim 1, wherein the accelerator target structure is further comprised of a heat sink coupled to the x-ray emitting target.