Radiant energy – With charged particle beam deflection or focussing – Magnetic lens
Patent
1987-03-31
1988-08-30
Fields, Carolyn E.
Radiant energy
With charged particle beam deflection or focussing
Magnetic lens
250396R, 250398, 2504923, G21K 108
Patent
active
047679301
ABSTRACT:
A method and an apparatus for irradiating a relatively large area with a charged particle beam. In the method, a pencil-like beam is generated and spread along a fan axis perpendicular to the beam axis. The fan axis is rotated around the beam axis so that finally a circular area is irradiated. The apparatus includes means for generating a pencil-like beam, a lens system for spreading the beam along the fan axis and means to rotate the fan axis around the beam axis. In a preferred embodiment, the beam is spread such that its transverse intensity distribution increases with increasing distance from the beam center so that the area swept by the beam is irradiated with an even intensity.
REFERENCES:
patent: 2866902 (1958-12-01), Nygard
patent: 3028491 (1962-04-01), Schleich
patent: 3120609 (1964-02-01), Farrell
patent: 4293772 (1981-10-01), Stieber
Electromedica No. 3-4, 1977, "Radiotherapy Today: The Mevatron 20, a Compact High-output Linear Accelerator", Haas et al., pp. 101 to 106.
Medical Physics 11, 1984, "Advances in Linear Accelerator Design for Radiotherapy", Karzmark, pp. 105 to 127.
Krispel Franz
Stieber Volker
Fields Carolyn E.
Jay Mark H.
Miller John A.
Siemens Medical Laboratories, Inc.
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