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Proceedings Paper

Design Of A Digital Beam Attenuator System For Chest Radiography
Author(s): Bruce H. Hasegawa; James T. Dobbins III; Shaikh Naimuddin; Charles A. Mistretta; Walter W. Peppler; Ching-Shan Lee; Sabee Molloi; Nicholas Hangiandeou; Bakki B. Kudva; Kenneth M. Melbye
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Paper Abstract

We have been testing a digital beam attenuator (DBA) system for fabricating patient-specific compensating filters to improve image quality in chest radiography. At present, the technique is limited by a 2 hour attenuator fabrication time and a 20 mR exposure used to acquire an initial image from which the attenutor is designed. We now are developing an improved DBA system capable of generating, in a few seconds, patient-specific compensating filters for clinical chest radiography. The initial image will be acquired at less than 1 mR of skin exposure using an intensifying screen viewed by a low light-level television camera. Image processing including scatter and beam-hardening corrections generate a 614x614 matrix of values from which the attenuator is fabricated. The attenutor will be fabricated with individual layers having a 16x16 format using a special purpose dot-matrix printer. Successive layers are shifted by a quarter of a dot width to maintain the 614x614 sampling frequency in the final attenuator. After the attenuator is positioned automatically in the x-ray beam, a final image will be acquired directly on film.

Paper Details

Date Published: 11 June 1985
PDF: 8 pages
Proc. SPIE 0535, Application of Optical Instrumentation in Medicine XIII, (11 June 1985); doi: 10.1117/12.947279
Show Author Affiliations
Bruce H. Hasegawa, University of Wisconsin Clinical Sciences Center (United States)
James T. Dobbins III, University of Wisconsin Clinical Sciences Center (United States)
Shaikh Naimuddin, University of Wisconsin Clinical Sciences Center (United States)
Charles A. Mistretta, University of Wisconsin Clinical Sciences Center (United States)
Walter W. Peppler, University of Wisconsin Clinical Sciences Center (United States)
Ching-Shan Lee, University of Wisconsin clinical Sciences Center (United States)
Sabee Molloi, University of Wisconsin Clinical Sciences Center (United States)
Nicholas Hangiandeou, University of Wisconsin Clinical Sciences Center (United States)
Bakki B. Kudva, University of Wisconsin (United States)
Kenneth M. Melbye, Kroy Incorporated (United States)


Published in SPIE Proceedings Vol. 0535:
Application of Optical Instrumentation in Medicine XIII
Samuel J. Dwyer; Roger H. Schneider, Editor(s)

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