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Proceedings Paper

Feasibility Of Selective Exposure Radiography
Author(s): Bruce H Hasegawa; James T. Dobbins; Walter W. Peppler; Jack T Cusma; Charles A, Mistretta; Bakki V Kudva; Michael S Van Lysel; Ching-Shan Lee; Shaikh Naimuddin; Jerry C Lancaster
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Paper Abstract

The concept of selective exposure radiography encompasses those techniques which spatially modulate the incident x-ray field to produce a more uniform exit field arising from the patient. The resulting reduction in the dynamic range of the exposure field offers several advantages. In conventional radiography, selective exposure techniques allow all areas of the image to be placed in the linear portion of the film characteristic curve so that local contrast is maximized. With video systems, the reduction in dynamic range minimizes the impact of electronic noise behind the least transmissive regions of the patient. With both electronic and photographic detectors, selective exposure radiography is characterized by uniform quantum statistics and uniform scatter across the image. Several selective exposure techniques currently are being investigated. They include compensating filters placed manually in the x-ray field as well as fan-beam geometries in which the x-ray tube output is modulated with a feedback circuit to maintain constant exposure to the image receptor. At the University of Wisconsin, we have been investigating a digital system which uses an initial low-dose patient image to design an attenuator with transmission complimentary to that of the patient. The attenuator is fabricated for each patient and is positioned automatically in the x-ray beam prior to the acquisition of the final compensated image. The possible applications of this device include chest radiography, coronary angiography, subtraction angiography, and accurate digital videodensitometry.

Paper Details

Date Published: 15 June 1984
PDF: 8 pages
Proc. SPIE 0454, Application of Optical Instrumentation in Medicine XII, (15 June 1984); doi: 10.1117/12.939342
Show Author Affiliations
Bruce H Hasegawa, University of Wisconsin (United States)
James T. Dobbins, University of Wisconsin (United States)
Walter W. Peppler, University of Wisconsin (United States)
Jack T Cusma, University of Wisconsin (United States)
Charles A, Mistretta, University of Wisconsin (United States)
Bakki V Kudva, University of Wisconsin (United States)
Michael S Van Lysel, University of Wisconsin (United States)
Ching-Shan Lee, University of Wisconsin (United States)
Shaikh Naimuddin, University of Wisconsin (United States)
Jerry C Lancaster, University of Wisconsin (United States)


Published in SPIE Proceedings Vol. 0454:
Application of Optical Instrumentation in Medicine XII
Samuel J. Dwyer; Roger H. Schneider, Editor(s)

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