US 5,012,111 AGranted

Ion beam irradiation apparatus

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorKazuhiro Ueda

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Abstract

An ion-beam irradiation apparatus is provided which has x- and y-deflection magnets to wobble an ion beam for uniformly irradiating a field exceeding the beam diameter in size. An exciting current is supplied to the x- and y-deflection magnets independently, and the exciting current inlcudes both an ac component and a dc bias component. Suitable control of these components enables the irradiated field to be varied in shape and location. In particular, racetrack-shaped fields can be irradiated by adding dc components to triangular ac components. When used in cancer radio therapy, this apparatus enables the irradiated field to be moved quickly from one location to another, and to be matched with the shape of the tumor. Benefits of this apparatus include short treatment times and efficient use of the ion beam, so that substantially all of the ion beams may be delivered to the target.

Claims8

Dependent claims

An ion beam irradiation apparatus comprising:

a particle accelerator for developing an ion beam;
first deflection means disposed in the path of said ion beam, for deflecting said ion beam in a first direction perpendicular to the axis of the path of said ion beam;
second deflection means disposed in the path of said ion beam, for deflecting said ion beam in a second direction perpendicular to the axis of the path of said ion beam and perpendicular to said first direction in which the path of said ion beam is deflected by said first deflection means;
a first power supply for supplying a first exciting current having a first ac component and a first dc bias component to said first deflection means;
a second power supply for supplying a second exciting current having a second ac component and a second dc bias component to said second deflection means;
and
control means for varying magnetic fields developed by said first and second deflection means in response to the amplitude and phase of said first and second ac components and the polarity and magnitude of said first and second dc bias components and thereby controlling the size and the direction scanned by said ion beam.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/366,539Filed 15 Jun 1989
Priority: JP 63-15410821 Jun 1988
Granted: 30 Apr 1991
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

A61N 5/10
Radiation therapy: x-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
A61N 5/1043
With spatial modulation of the radiation beam within the treatment head: scanning the radiation beam, e.g. spot scanning or raster scanning
G21K 1/087
Deviation, concentration or focusing of the beam by electric or magnetic means: by electrical means
G21K 5/10
Irradiation devices: with provision for relative movement of beam source and object to be irradiated