X-ray or gamma ray systems or devices – Beam control – Collimator
Patent
1988-03-07
1989-09-19
Fields, Carolyn E.
X-ray or gamma ray systems or devices
Beam control
Collimator
378147, 378204, 378150, G21K 104
Patent
active
048688444
ABSTRACT:
In a radiation therapy machine it is desirable to produce irregular radiation field shapes in order to shield critical organs not invaded by the tumor. A multileaf collimator is formed of a multiplicity of heavy metal bar leaves driven relative to frames which are driven relative to jaws of a rectangular field collimator by electric motors and flexible cables.
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Cole Stanley Z.
Fields Carolyn E.
Fisher Gerald M.
Hynds Joseph A.
Varian Associates Inc.
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