Most current research in mammographic detector development has been focused on digital detectors. However, the vast majority of clinical practice still uses film/screen systems. This paper will report on the
design and performance features of a new film/screen system for mammography that has the potential to become the new gold standard in image quality for this demanding application. This new system includes a new film and new intensifying screens. The new film has unique emulsions on each side of the base. It features novel fine-grain, metal ion-doped silver halide microcrystals. It is exposed with a single intensifying screen. Two different intensifying screens have been developed to create systems with different speeds. The new screens use an improved phosphor and new coating structures. The highfrequency MTF has been boosted. The system provides higher contrast, lower noise, and sharper images.
This paper describes two new presentation methods that are intended to improve the ability of radiologists to visualize abnormalities in mammograms by enhancing the appearance of the breast parenchyma pattern relative to the fatty-tissue surroundings. The first method, referred to as mountain- view, is obtained via multiscale edge decomposition through filter banks. The image is displayed in a multiscale edge domain that causes the image to have a topographic-like appearance. The second method displays the image in the intensity domain and is referred to as contrast-enhancement presentation. The input image is first passed through a decomposition filter bank to produce a filtered output (Id). The image at the lowest resolution is processed using a LUT (look-up table) to produce a tone scaled image (I'). The LUT is designed to optimally map the code value range corresponding to the parenchyma pattern in the mammographic image into the dynamic range of the output medium. The algorithm uses a contrast weight control mechanism to produce the desired weight factors to enhance the edge information corresponding to the parenchyma pattern. The output image is formed using a reconstruction filter bank through I' and enhanced Id.
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