Design Of A Digital Beam Attenuator System For Chest Radiography

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

doi:10.1117/12.947279

11 June 1985 Design Of A Digital Beam Attenuator System For Chest Radiography

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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Proceedings Volume 0535, Application of Optical Instrumentation in Medicine XIII; (1985) https://doi.org/10.1117/12.947279
Event: 1985 Medical Imaging Conferences, 1985, California, United States

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.

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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, and Kenneth M. Melbye "Design Of A Digital Beam Attenuator System For Chest Radiography", Proc. SPIE 0535, Application of Optical Instrumentation in Medicine XIII, (11 June 1985); https://doi.org/10.1117/12.947279

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KEYWORDS

Attenuators

Chest

Radiography

Printing

Image processing

Sensors

X-rays

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