X-ray or gamma ray systems or devices – Specific application – Absorption
Patent
1998-04-06
2000-03-21
Bruce, David V.
X-ray or gamma ray systems or devices
Specific application
Absorption
378 4, 378 19, G01N 2304, A61B 603
Patent
active
060410973
ABSTRACT:
A gantry (10) includes a large diameter bearing having an outer race (12) and an inner race (16) which surrounds an examination region. An x-ray tube (18) and collimator (52) are mounted to the inner race, as is a flat panel detector (20) and a mechanical mechanism (50) for moving the flat panel detector closer to and further from the examination region. A timing and control circuit (30) controls a motor (22) which indexes the inner race around the examination region, an x-ray power supply (32) which pulses the x-ray tube in a fluoroscopic mode at discrete positions around the examination region, and a read out circuit (34) which reads out a frame of data after each pulse of the x-ray tube. The read out frames of data are stored in a frame memory (36) and reconstructed by a reconstruction processor (38) into a volumetric image representation for storage in a volume image memory (40). A video processor (42) reformats individual frames from frame memory (36) or selected portions of volume image representation from the volume image memory (40) into appropriate format for display on a video monitor (44). A magnification control (54) coordinates adjustment of the collimator (52) and movement of the flat plate detector toward and away from the examination region.
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Ivan Andrew J.
Mattson Rodney A.
Roos Pieter Gerhard
Bruce David V.
Picker International Inc.
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