Simulation, Measurements and Image Processing for Capillary Optical Digital Mammorgraphy (96 Breast)
Annual rept. 1 Sep 1998-31 Aug 1999
STATE UNIV OF NEW YORK AT ALBANY
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Capillary optics, which use total external reflection to transmit x rays, have been proved to have great advantages in scatter reduction and resolution improvement in mammography application. The purpose of the proposed work is to perform lens simulation and image artifact elimination as part of the work of capillary optical mammography research. A lens simulation extended from the-previous single fiber simulation has been implemented, a lens for the protocol mammography system has been re-measured in an extended energy range and analyzed with the program. The simulation has been proved to be helpful in understanding the lens performance. Modulation Transfer Function MTF is the most fundamental measurement of spatial resolution used in radiology. Non-uniform transmission introduces difficulties in MTF measurement. A method to measure MTF by taking an edge image and processed with background reduction technique has been developed. The modeling capability has been extended and has lead to a real development of understanding of the nature of polycapillary defects, which is already leading to improvements in the manufacturing processes. Further, the increased confidence in the modeling allows future lens geometries to be effectively tested in simulation so that design parameters can be rapidly optimized.
- Medicine and Medical Research