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Photon counting threshold optimization in mammography

Authors
Journal
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment
0168-9002
Publisher
Elsevier
Publication Date
Volume
563
Issue
1
Identifiers
DOI: 10.1016/j.nima.2006.01.080
Keywords
  • X-Ray
  • Mammography
  • Photon Counting
  • Dqe
Disciplines
  • Physics

Abstract

Abstract The influence of detection threshold on the performance of ideal photon counting sensors is investigated in mammography for several X-ray tube anode/filter combinations and various breast thicknesses. Based on linear X-ray system theory, a method is proposed to take into consideration detector contrast modulation in the domain of X-ray energy as well as effects related to scattered radiation. Breast screening procedures are modelled as radiographic tasks in which low-contrast objects (tumours or microcalcifications) have to be detected in a noisy image background. For ideal photon counting detectors, results at zero spatial frequency show that higher detection thresholds must be implemented when imaging a thick compressed breast, compared to a thin compressed breast. In practice, the photon counting threshold also affects the image noise and the spatial resolution of hybrid pixel detectors, by tuning the amount of charge-shared events. To be generalized to more realistic imaging situations, this analysis must be performed over the full range of spatial frequencies and include additional detector noise parameters.

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