X-ray or gamma ray systems or devices – Electronic circuit – With display or signaling
Patent
1998-12-09
2000-10-17
Porta, David P.
X-ray or gamma ray systems or devices
Electronic circuit
With display or signaling
378 984, 378147, H05G 164
Patent
active
061342971
ABSTRACT:
An apparatus and method for removing scatter from x-ray images acquired by two-dimensional digital detectors. The apparatus consists of, in physical order, an x-ray source, a front two-dimensional x-ray detector, a beam selector, and a rear two-dimensional x-ray detector. The subject is located between the x-ray source and front detector. There two types of beam selectors, one allowing only primary x-rays to reach selected locations of the rear detector, and the other allowing primary x-rays and scatter to reach selected locations of the rear detector while allowing only scatter x-rays to reach shadowed locations of the rear detector. The method includes determining a low-resolution primary x-ray rear detector image, calculating an approximate low-resolution primary x-ray front detector image, calculating a high-resolution primary image at the front detector, and applying one or more of several correction procedures for achieving higher accuracy from the approximations.
REFERENCES:
patent: 5327476 (1994-07-01), Kemner
patent: 5648997 (1997-07-01), Chao
patent: 5825032 (1998-10-01), Nonaka et al.
Joseph Y. Lo et al., Scatter Compensation in Digital Chest Radiography Using the Posterior Beam Stop Technique, 21 Medical Physics 435 (Mar. 1994).
Advanced Optical Technologies, Inc.
Porta David P.
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