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ST: Fachverband Strahlen- und Medizinphysik

ST 6: Medical Imaging

ST 6.2: Vortrag

Donnerstag, 2. April 2020, 11:15–11:30, H-HS II

Photon-Counting Detectors for Conventional and Spectral Breast Imaging — •Mirko Riedel, Lisa Heck, Thorsten Sellerer, Korbinian Mechlem, Josef Scholz, Christian Petrich, Lorenz Birnbacher, Martin Dierolf, and Julia Herzen — Chair of Biomedical Physics, Department of Physics and Munich School of BioEngineering, Technical University of Munich, 85748 Garching, Germany

Contrast-enhanced spectral mammography (CESM) is used as method for follow-up examinations in case of uncertain mammography findings. CESM has been successfully demonstrated in case of narrow polychromatic [1] and quasi monochromatic spectra. By the introduction of energy-resolving photon-counting detectors to medical imaging research, novel imaging techniques have been developed. In order to evaluate the performance of these techniques, we compared different photon-counting detector systems on conventional mammography and CESM. Three methods to obtain an iodine image, including K-edge subtraction (KES) in two measurements, one-shot KES and a two-material decomposition [2], were investigated with novel detectors. The contrast-to-noise ratios for all three methods have been compared to evaluate their ability to depict the iodine distribution.

[1] Lewin, J. M., et al. "Dual-energy contrast-enhanced digital subtraction mammography: feasibility." Radiology 229.1 (2003)

[2] Mechlem, K., et al. "Spectral angiography material decomposition using an empirical forward model and a dictionary-based regularization." IEEE transactions on medical imaging 37.10 (2018)