US PATENT SUBCLASS 378 / 150
.~.~ Variable

Current as of: June, 1999
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378 /   HD   X-RAY OR GAMMA RAY SYSTEMS OR DEVICES

145  DF  BEAM CONTROL {6}
147  DF  .~ Collimator {3}
150.~.~ Variable {3}
151  DF  .~.~.~> Automatic
152  DF  .~.~.~> With linear leaf motion
153  DF  .~.~.~> With pivotal leaf motion

DEFINITION

Classification: 378/150

Variable:

(under subclass 147) Subject matter wherein the shape, size, axial direction, or focal length of the beam is variable.

(1) Note. Variable collimators are referred to in the art by numerous alternative terms such as diaphragms, shutters, screens, masks, or cones.