Optimization of Technique Factors for Full-Field Digital Mammography and Comparison of Optimized Techniques to Screen-Film Mammography
Annual summary rept. 1 Jul 1999-1 Feb 2001
NORTHWESTERN UNIV EVANSTON IL
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The technical objectives of this study are to determine optimum techniques for a flat-panel Cesium-iodide silicon-diode full-field digital mammography system and to compare those optimized techniques to screen-film mammography at equal breast doses. Optimum techniques will be determined for the full range of compressed breast thicknesses and breast compositions. Optimization will be done by maximizing low- contrast lesion detectability in tissues of interest, especially glandular tissues, while keeping exposure times sufficiently short and mean glandular breast doses equal to those of screen-film mammography. The effect of full-field digital user-selectable technique factors, including tube target material, filtration material, kVp setting, and mAs setting, on detector signal-to-noise ratios SNR, contrast-to-noise ratios, low-contrast lesion detection, and radiation dose will be independently quantified. Once optimum technique factors for this full-field digital mammography system are obtained for each breast thickness and composition, those optimum techniques will be compared to optimum techniques for screen-film mammography under the constraint of equal average glandular breast doses.
- Medicine and Medical Research