Abstract
Pixel size is an important parameter in digital mammography because it directly influences both the image quality and the cost of the imaging system. We have investigated the effects of pixel/aperture sizes on image properties in digital mammography. Studies were made with a small field digital mammography unit (SenoVision by GE Medical System, Milwaukee, WI) which provides a 30 micrometer X 30 micrometer pixel/aperture size. Pixel-averaging was used to increase both sampling distance and aperture size. Sub-sampling was used to increase the sampling distance without altering the aperture size. The effective pixel size was increased by pixel- averaging or sub-sampling. A tilted slit camera was employed to measure the presampling MTF. Uniform exposure images were used to measure SNRs and NEQs for various pixel sizes. Simulated microcalcifications of various sizes were imaged to evaluate the low contrast performance as well.
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