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9 March 2018 Simulation study of scatter correction in photon counting CT
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To understand how the signals are affected by the radiation scattered by the test subject in Photon Counting CT system, the characteristics of the scattered photons were evaluated using Monte Carlo simulation “GEANT” (GEometry ANd Tracking). Cylinder water phantoms with diameters of 165 – 380 mm were examined, and the X-ray energy from 20 to 120 keV was divided into 5 ranges with a width of 20 keV in the detector. With the phantom with the diameter of 380 mm, the ratio of signals which are scattered in the phantom to those of the total X-rays incident on the detector turned out to be more than 50% in the 20 - 40 keV range, while it remained 2% in the 100 - 120 keV one. The profiles of this ratio were approximated by a quadratic function αx2 +β in each energy range where x corresponds to the longitudinal detector position. It was found that α and β can be described with the energy range and phantom size.
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Shinichi Kojima, Kazuma Yokoi, and Isao Takahashi "Simulation study of scatter correction in photon counting CT", Proc. SPIE 10573, Medical Imaging 2018: Physics of Medical Imaging, 1057355 (9 March 2018);

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