Partially-transparent-shield-method for scattered radiation comp

Details Partially-transparent-shield-method for scattered radiation comp Partially-transparent-shield-method for scattered radiation comp

1994-11-30

1997-02-11

Wong, Don

X-ray or gamma ray systems or devices

Electronic circuit

With display or signaling

378 7, H05G 164

Patent

active

056028954

ABSTRACT:
The disclosed methods for generating scatter-compensated radiation image are based on one irradiating shot of the object. By comparing the detected signal under a partially transparent body (ea. disk or strip), positioned between the x-ray source and the object being imaged, with the signal in the image near the border of the shadow of the partially transparent body, the radiation scatter signal in the location of the body is calculated. In case of a polychromatic source, calibration with two known materials allows accurate calculation of the radiation scatter. The partially transparent bodies are positioned at several locations in between object and source and, by means of interpolation technique, the radiation scatter in every location of interest can be calculated. The radiation scatter image is subtracted from the original image of the object. The primary signal (=without radiation scatter) in the location of the bodies has undergone an extra drop because of the body but the information about the object under the body is not lost. If necessary, in a next step the image can be restored by compensating the effect of the bodies on the primary signal.

REFERENCES:
patent: 4549307 (1985-10-01), Macovski
patent: 4741009 (1988-04-01), Yamagata et al.

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