Simulation, Measurements and Image Processing for Capillary Optical Digital Mammography

摘要

An extensive computer modeling for polycapillary optics that includes realistic models for the effects of profile defects shows good agreement with measured data. Measured polycapillary fiber transmission is in excess of 65% at 20 keV for borosilicate glass optics, and is in excess of 42% for short leaded glass optics. Measured high angle transmission which corresponds to scatter transmission is lower than 1% for 12 cm long borosilicate optics at 20 kev and less than 4% for 3 cm long leaded glass optics at 80 keV. A long prototype borosilicate magnifying tapered monolithic optic has demonstrated contrast enhancement due to removal of scatter transmission, while at the same time increasing the system MTF performance at all spatial frequencies. Computer modeling, measurement and defect studies have led to better manufacturing capabilities for monolithic optics. The newly magnifying monolithic optics have a high transmission efficiency. Multitaper optics have been produced and tested. Image analysis have provided the means for the image artifact analysis and reduction.