11 June 1985 Design Of A Digital Beam Attenuator System For Chest Radiography
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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.
© (1985) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Bruce H. Hasegawa, Bruce H. Hasegawa, James T. Dobbins III, James T. Dobbins III, Shaikh Naimuddin, Shaikh Naimuddin, Charles A. Mistretta, Charles A. Mistretta, Walter W. Peppler, Walter W. Peppler, Ching-Shan Lee, Ching-Shan Lee, Sabee Molloi, Sabee Molloi, Nicholas Hangiandeou, Nicholas Hangiandeou, Bakki B. Kudva, Bakki B. Kudva, Kenneth M. Melbye, 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); doi: 10.1117/12.947279; https://doi.org/10.1117/12.947279
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