Apparatus and method for adjusting radiation in a radiation-emit

Details Apparatus and method for adjusting radiation in a radiation-emit Apparatus and method for adjusting radiation in a radiation-emit

1995-07-20

1996-10-08

Porta, David P.

X-ray or gamma ray systems or devices

Beam control

Collimator

378 65, 2504921, G21F 504

Patent

active

055639259

ABSTRACT:
In a radiation emitting device, particularly in a radiation treatment device, the actual radiation delivered to an object via a radiation beam is adjusted dependent on the dimensions of an opening in a plate arrangement provided between a radiation source and an object so that the radiation output has a constant wedge factor over an irradiation field, regardless of the size of the opening. The wedge factor is defined as the ratio between a reference radiation output along a reference axis of the beam with a predetermined physical wedge in the beam path and an actual radiation output of the beam in a substantiallylossless beam path.

REFERENCES:
patent: 5019713 (1991-05-01), Schmidt
patent: 5148032 (1992-09-01), Hernandez
patent: 5216255 (1993-06-01), Weidlich
patent: 5332908 (1994-07-01), Weidlich
Faiz M. Khan, Ph.D., "The Physics of Radiation Therapy", 2d ed., pp. 234-238.
Siemens Product Brochure, "Digital Systems for Radiation Oncology", pp. 1-16.

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