X-ray or gamma ray systems or devices – Specific application – Absorption
Patent
1987-11-27
1989-10-03
Fields, Carolyn E.
X-ray or gamma ray systems or devices
Specific application
Absorption
378 18, 378 98, G01N 2304
Patent
active
048721883
ABSTRACT:
A fan beam of radiation (12) is projected on first and second detector arrays (18, 20). The detector arrays and fan beam are swept across a phantom (D). Fine wires (82) in the phantom each cast shadows over fractions of a plurality of the detectors during the sweep. Phantom images (44, 46) are generated from the first and second detector arrays with corresponding pixels of each image corresponding to the same path between a radiation source (10) and corresponding detectors in the arrays. A linear interpolation (50) interpolates the pixels of one of the images to shift their effective spatial position. A transform means (52) transforms the linear interpolated and second phantom image into at least one composite image (54). The linear interpolation is iteratively adjusted (C) to minimize phase change artifacts in corresponding pixels of the composite image. After the appropriate interpolation for each detector or group of detectors has been determined, the appropriate linear interpolations are stored (72). Thereafter, the stored linear interpolations are utilized each time a subject is examined.
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Lauro Karen L.
Sones Richard A.
Fields Carolyn E.
Picker International Inc.
Porta David P.
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