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24 July 1998 Technique to improve the effective fill factor of digital mammographic imagers
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Current clinical mammographic imaging has been limited to screen/film, but advances in photodetector and x-ray converter technology has opened up the possibility of significantly improving mammographic screening with digital imagers. One limitation of some recently developed in direct detection imagers is a limited optical fill factor in the photodetector. A small fill factor reduces the amount of light collected from individual x-ray interactions in the screen. It can also lead to an overall reduction in the number of x-ray quanta detected. In addition, the fill factor usually decreases with an increase in photodetector resolution. To reduce these effects, we propose a technique for improving the effective fill factor of any indirect detection imager by incorporating focusing microlens arrays between the phosphor screen and the photodetector. In this investigation, we evaluate the light collection efficiencies of our proposed imager/microlens combination using Monte Carlo simulation and optical ray tracing.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Nicholas Petrick, Shyam P. Keshavmurthy, Heang-Ping Chan, Mitchell M. Goodsitt, and Berkman Sahiner "Technique to improve the effective fill factor of digital mammographic imagers", Proc. SPIE 3336, Medical Imaging 1998: Physics of Medical Imaging, (24 July 1998);

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