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4 October 2024 Image quality evaluation of charge summing correction on CdTe-based photon counting breast CT
Sriharsha Marupudi, Joseph A. Manus, Muhammad Ghani, Stephen J. Glick, Bahaa Ghammraoui
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Proceedings Volume 13152, Developments in X-Ray Tomography XV; 1315219 (2024) https://doi.org/10.1117/12.3027654
Event: Optical Engineering + Applications, 2024, San Diego, California, United States
Abstract
This study evaluates the impact of charge summing correction (CSC) on a Cadmium Telluride (CdTe) Photon Counting Detector in breast CT. A laboratory benchtop system that consists of a 0.1mm pixel pitch CdTe detector and a tungsten anode x-ray source. Images were acquired at 55kVp with 2mm Al external filtration under three different tube currents: 25, 100, and 200mA. Performance was assessed using contrast to noise ratio (CNR), modulation transfer function (MTF), noise power spectrum (NPS), and iodine quantification. Anticoincidence (AC) and single pixel (SP) modes were compared, both with signal-to-thickness calibration and FDK reconstruction. AC mode showed enhanced low-energy contrast and accurate iodine quantification, while SP mode had better CNR at low-energy. High x-ray fluence reduced AC mode uniformity, but not SP. Results suggest that CSC in breast CT improves iodine quantification but at the cost of increased noise in low-energy images. These effects are dependent on the studied system and operational parameters.
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Sriharsha Marupudi, Joseph A. Manus, Muhammad Ghani, Stephen J. Glick, and Bahaa Ghammraoui "Image quality evaluation of charge summing correction on CdTe-based photon counting breast CT", Proc. SPIE 13152, Developments in X-Ray Tomography XV, 1315219 (4 October 2024); https://doi.org/10.1117/12.3027654
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KEYWORDS
X-ray computed tomography
Breast
Photon counting
Surface plasmons
Image quality
Iodine
Modulation transfer functions
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