X-ray or gamma ray systems or devices – Electronic circuit – With display or signaling
Patent
1995-12-29
1997-07-15
Wong, Don
X-ray or gamma ray systems or devices
Electronic circuit
With display or signaling
378 9812, 378147, H05G 164
Patent
active
056489978
ABSTRACT:
An apparatus, for producing scatter-free two-dimensional X-ray images and eliminating scattering effects on integrated detector arrays, includes, in physical sequence from front to back, an X-ray source, a front two-dimensional detector positioned behind a subject for detecting both primary and scatter X-rays produced from striking the subject with the source's radiation, a collimator with holes for passing a portion of the primary X-rays, and a rear two-dimensional detector for receiving this portion. A method for producing scatter-free images which includes the steps of; X-raying the subject with high and low energy, retrieving an image pair I.sub.rHl and I.sub.rLl from the rear detector, normalizing and subtracting dark signals from I.sub.rHl and I.sub.rLl to yield an image pair D.sub.rHl and D.sub.rLl, solving D.sub.rHl and D.sub.rLl to determine b and s, retrieving an image I.sub.fh from the front detector, normalizing and subtracting dark signals from I.sub.fh to yield D.sub.fh representing the primary and scatter X-rays sum, determining D.sub.fSl of image D.sub.fh at the detector cells using b and s, interpolating D.sub.fSl for the front detector cells to yield D.sub.fSh, subtracting D.sub.fSh from D.sub.fh to yield D.sub.fPh representing the two-dimensional scatter-free image of the subject.
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Advanced Optical Technologies, Inc.
Wong Don
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