Denoising of Digital Mammography Images Using Wavelet Transform

Abstract

The optimum exposure parameters are found when examined using the automatic mode in FFDM. improve the image quality by applying denoising algorithm and propose methods to reduce AGD(Average Grandular Dose) a patient can receive. For the experiment, Nuclear Associates Model 18-222 phantom was the used, and the entrance dose and AGD were measured. And then, Signal, Noise, SNR and FOM(Figure of Merit) were measured, compared and analyzed image denoising before and after. As the experiment result, first, SNR was the highest at Mo/Mo 23kVp and W/Rh 35kvp was the lowest for the average glandular dose. It showed to use 28kVp of W/Rh to be the best through the result of FOM. SNR was the highest at Mo/Mo 23kVp(image denoising), and it showed to W/Rh and 28kVp to be the best in the FOM result which AGD was considered at the same time. By the image denoising, it is possible to reduce noise while maintain important information in the image.

Filament material evaluation for breast phantom fabrication using three-dimensional printing

“…Com pared with other breast can cer test ing meth ods, mam mog ra phy has advan tages in terms of time and cost, and above all, it is highly ad van ta geous for de tect ing microcalcification. Fur ther more, the in tro duc tion of dig i tal mam mog raphy equip ment has en hanced the di ag nos tic abil ity and max i mized the con ve nience of this method [4] How ever, some re ports have claimed that mammog ra phy can in crease ra di a tion ex po sure be cause it uses a low tube volt age and high tube cur rent, thereby in creas ing the in ci dence of can cer [5][6][7][8][9][10]. There fore, ac cu rate eval u a tion of the amount of ra di a tion en tering the breast when con duct ing mam mog ra phy is impor tant.…”

Dose Evaluation Using Mathematical Simulation of Radiation Exposure Body in Mammography System

“…최근 디지털유방영상시스템의 경우 유방두께에 따라 타깃과 필터조합의 선택과 노출조건이 자동으로 설정 되는 자동노출모드가 많이 이용되고 있다. 자동노출조 건이 설정될 경우 편리성은 극대화 되지만 실제 피폭 에 영향을 주는 요인은 고려되어야 한다 [4] . 따라서 다 양한 유방크기 및 두께에 따른 정확한 검사가 시행되 어야 하며 [5] , 타깃과 필터재질의 조합에 대한 최적의 노출조건을 찾아야 하는 문제가 대두된다 [6] .…”