Abstract
Digital breast tomosynthesis (DBT) and contrast enhancement (CE) for both DBT (CEDBT) and planar mammography (CEDM) are being investigated to increase conspicuity of malignant lesions. To image above the k-edge of iodine (33 keV), CEDBT requires x-ray energies higher than those of typical mammograms (~28 kVp). Increasing the thickness of the detector’s amorphous selenium (a-Se) layer improves x-ray absorption and detective quantum efficiency (DQE), particularly at higher energies. For DBT, where systems are often designed with partially isocentric geometries, thicker a-Se layers may result in degradation of the modulation transfer function (MTF) for oblique views. We employed a cascaded linear system model to analyze the effect of oblique entry on MTF. Also, the model was experimentally validated using 200 and 300 μm a-Se flat panel imagers. Finally, we use an ideal-observer SNR model for projection and DBT imaging to optimize a-Se layer thickness for detectability of iodinated objects.
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Hu, YH., Scaduto, D.A., Zhao, W. (2012). The Effect of Amorphous Selenium Thickness on Imaging Performance of Contrast Enhanced Digital Breast Tomosynthesis. In: Maidment, A.D.A., Bakic, P.R., Gavenonis, S. (eds) Breast Imaging. IWDM 2012. Lecture Notes in Computer Science, vol 7361. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-31271-7_2
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DOI: https://doi.org/10.1007/978-3-642-31271-7_2
Publisher Name: Springer, Berlin, Heidelberg
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