X-ray or gamma ray systems or devices – Beam control – Filter
Patent
1988-07-21
1990-02-27
Howell, Janice A.
X-ray or gamma ray systems or devices
Beam control
Filter
378200, 378150, 378156, G21K 300, G21K 104
Patent
active
049052683
ABSTRACT:
A radiographic apparatus (10) includes an x-ray tube (16), an off-focal radiation collimator (20), a shutter (22), and a primary beam defining collimator (24) between the x-ray tube and patient receiving region (14). The off-focal collimator is mounted within a collar (48) which surrounds an x-ray port (36) of the x-ray tube. The tube port is sealed from the atmosphere by an aluminum window (46). A plate (62) of a radiation blocking material is rotatably mounted by a bearing (70) within the collar closely adjacent the aluminum window. By rotating the moveable plate, aperture or radiation passing slots or portions (62, 64) of different sizes are selectively brought into alignment between a focal spot (34) of the x-ray tube and a radiation passing region or slot (52) of a stationary plate (50) at the distal end of the collar. The aligned slots block the passage of off-focal radiation. Moreover, rotating slots of different sizes into alignment changes the size or angle of the x-ray fan beam.
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European Search Report PCT/GB 86/00655, Jan. 16, 1987.
Levar Robert E.
Mattson Rodney A.
Howell Janice A.
Hynds Joseph A.
Picker International Inc.
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