Radiographic image processing method and photographic imaging ap

Details Radiographic image processing method and photographic imaging ap Radiographic image processing method and photographic imaging ap

1990-03-01

1992-07-21

Howell, Janice A.

X-ray or gamma ray systems or devices

Electronic circuit

Exposure timer

378 56, 378 62, G01B 1502

Patent

active

051329980

ABSTRACT:
Transmission images are obtained by radiating X-rays having two different energy levels onto a subject in one direction, and then transformed into logarithmic images, respectively. From these logarithmic images, a contrast ratio due to the two kinds of X-rays having different energies is obtained. From this contrast ratio, the term relating to the thickness of the subject is eliminated, thereby providing information only relating to the quality of the material. By collating the information with the previously measured data of materials, the material of the subject is identified.

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Nuclear Instruments & Methods in Physics Research, Section -a vol. 242, No. 3, Jan. 1986, Amsterdam pp. 596-602; F. P. Bolin et al.: "A dual beam study with isotopic X- and Gamma-rays for in vivo limph pool assay".
Journal of Testing and Evaluation. vol. 13, No. 3, May 1985, Philadelphai U.S. pp. 211-216; F. L. Roder: "Principles, history, and status of Dual-Energy computerized tomographic explosives detection".
Physics in Medecine and Biology. vol. 23, No. 6, Nov. 1978, London GB pp. 1101-1114; H. W. Kramer et al.: "Combined cortical thickness and bone density determination by Photon absorptiometry".

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