KEYWORDS: Modulation transfer functions, Digital imaging, Optical filters, Chromium, Image filtering, Digital filtering, Computing systems, Sensors, Digital mammography, Radiography
To reduce the patients’ exposure, several low-dose images are necessary to obtain an image that can be used for
diagnosis. However, it is clinically undesirable to expose a patient to multiple exposures in order to obtain an optimal
image. The purpose of this study was to simulate a low-dose image from the image generated by a routine-dose. Images
of acrylic steps were obtained using multiple doses in digital mammography to generate additional noise. The additional
noise was calculated as three different noise sources. This study used the digital mammography system with different
detectors. It is computed radiography (CR) system and flat panel detector (FPD) system. This noise was added to take
into account the resolution of the X-ray detector using the following filters. The filters were designed based on the
presampled modulation transfer function (MTF) and digital MTF containing aliasing. The image simulated using the
presampled MTF filter was less similar to an actual low-dose image using the CR system. The image simulated using the
digital MTF filter was closer to an actual low-dose image compared to the image simulated using the presampled MTF
filter using the CR system. The image simulated using the digital MTF filter of the FPD system was similar to an actual
low-dose image. By using the proposed method, we were able to obtain a simulated low-dose image from an image
generated by a routine-dose.
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