Multileaf collimator

Details Multileaf collimator Multileaf collimator

1988-10-07

1991-04-30

Fields, Carolyn E.

X-ray or gamma ray systems or devices

Beam control

Collimator

378150, 378157, 2505051, G21K 102

Patent

active

050125060

ABSTRACT:
A collimator is described for a shielded effective point source of penetrating radiation, e.g. a radiotherapy machine which includes, after a primary collimator 16, a succession of a multileaf collimator 17, and a first and a second pair of independently adjustable block diaphragm leaves 30, 31, and 35, 36 at right angles to each other. By using rectilinear displacement of the multileaf collimator leaves 18 and the block diaphragm leaves 30, 31, a compact arrangement can be provided which fits into a standard RT collimator head. By curving the inner edges of the leaves to be tangential to the boundary ray an optimally reduced penumbra can be achieved. The block diaphragms enable the radiation leakage found in prior multileaf collimators to be minimized for small and off center irradiation patterns.

REFERENCES:
patent: 4463266 (1984-07-01), Brahme
patent: 4464778 (1984-08-01), Goldmann
patent: 4534052 (1985-08-01), Milcamps
patent: 4672212 (1987-06-01), Brahme
patent: 4672652 (1987-06-01), Huttenranch et al.
patent: 4739173 (1988-04-01), Blosser et al.
patent: 4754147 (1988-06-01), Maughan et al.
patent: 4766603 (1988-08-01), Okabe et al.
patent: 4794629 (1988-12-01), Pastyr et al.
patent: 4817125 (1989-03-01), Sklebitz
patent: 4868843 (1989-09-01), Nunan

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