Int J Comput Assist Radiol Surg - Phantom-based comparison of conventional versus phase-contrast mammography for LCD soft-copy diagnosis.

Tópicos

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Resumo

RPOSE: Liquid crystal display (LCD) of mammograms provides soft-copy results that differ in conventional and phase contrast mammography (PCM). PCM potentially offers the highest quality of sharpness and graininess, an edge emphasis effect on the object, and the highest image resolution. However, when the image is displayed on an LCD, the resolution depends on the pixel pitch and the PCM image data must be diminished. We investigated the observed effect on spatial resolution and contrast when conventional or phase contrast mammograms are viewed on an LCD.METHODS: Using the tissue-equivalent phantom (Model 1011A), a conventional mammogram and a magnification radiography image were obtained with a PCM system. This phantom contains simulated fibers, microcalcifications, and masses. The PCM image was reduced 1/1.75 to render it consistent with life size mammography using the nearest neighbor, bilinear, and bicubic interpolation methods. The images were displayed on a five million (5M)-pixel LCD with 100?% magnification. Ten mammography technicians observed the reduction images displayed on LCDs and reported their results.RESULTS: In the detectability of the microcalcifications, there was no significant difference between conventional mammograms and reduced PCM images. Regarding fibers and masses, detectability using reduced images was higher than those of conventional images. The detectability using images reduced by the nearest-neighbor method was lower than those of images reduced by two other interpolation methods. Bilinear interpolation was affected by the smoothing effect, while CNR was increased. In addition, since the noise of PCM image was reduced by an air gap effect, high detectability of key image features was found.CONCLUSIONS: Soft-copy display of phase-contrast mammograms is feasible with LCDs, while detectability of fibers and masses was best with bilinear interpolation and use of an air gap.

Resumo Limpo

rpose liquid crystal display lcd mammogram provid softcopi result differ convent phase contrast mammographi pcm pcm potenti offer highest qualiti sharp graini edg emphasi effect object highest imag resolut howev imag display lcd resolut depend pixel pitch pcm imag data must diminish investig observ effect spatial resolut contrast convent phase contrast mammogram view lcdmethod use tissueequival phantom model convent mammogram magnif radiographi imag obtain pcm system phantom contain simul fiber microcalcif mass pcm imag reduc render consist life size mammographi use nearest neighbor bilinear bicub interpol method imag display five million mpixel lcd magnif ten mammographi technician observ reduct imag display lcds report resultsresult detect microcalcif signific differ convent mammogram reduc pcm imag regard fiber mass detect use reduc imag higher convent imag detect use imag reduc nearestneighbor method lower imag reduc two interpol method bilinear interpol affect smooth effect cnr increas addit sinc nois pcm imag reduc air gap effect high detect key imag featur foundconclus softcopi display phasecontrast mammogram feasibl lcds detect fiber mass best bilinear interpol use air gap

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