Radiation therapy device with moveable aperture plate

Details Radiation therapy device with moveable aperture plate Radiation therapy device with moveable aperture plate

1990-04-09

1991-05-28

Berman, Jack I.

Radiant energy

Irradiation of objects or material

Ion or electron beam irradiation

2505051, 378 65, 378152, 378159, A61N 510

Patent

active

050197134

ABSTRACT:
In a radiation therapy device isodose curves are adjusted both by a movable plate that is controlled during the irradiation and by a non-movable filter body in the radiation path. The filter body is located in such a manner that it has decreasing absorbability in the opening direction of the plate. On the other hand, the plate produces a decreasing effective dose in its opening direction. by superimposing the two effects, it is possible to have the isodose curve in the object of irradiation rise or fall in the opening direction, so that a wide range of variation in the possible isodose curves is obtained, without having to change the fixed filter body.

REFERENCES:
patent: 3582650 (1971-06-01), Avery
patent: 4121109 (1978-10-01), Taumann et al.
patent: 4392239 (1983-07-01), Wilkens
Medical Physics, vol. 5, No. 2, Mar.-Apr. 1982, pp. 204-207, Am. Assoc. Phys. Med., New York, U.S.; R. K. Ten Haken et al.: "The Use of Nonhydrogenous Wedge for Therapeutic Neutron Beam Shaping".
Medical Physics, vol. 5, No. 5, Sep./Oct. 1978, pp. 426-429, Am. Assoc. Phys. Med.; P. K. Kijewski et al.: "Wedge-Shaped Dose Distributions by Computer Controlled Collimator Motion".
Mevatron Users Conference Proceedings, 1983; Bengt Bjarngard, Ph. D. JCRT, Harvard Medical School, Boston, Mass.: "Computer-Controlled Radiation Therapy", European Search Report File No. EP 89 10 6272.

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