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Congress: ECR24
Poster Number: C-14599
Type: EPOS Radiographer (scientific)
Authorblock: S. Mochinaga1, K. Nomura1, K. Fujii2, k. hirayama1, H. Taguchi3, Y. Muramatsu1, T. Kobayashi1; 1Kashiwa/JP, 2Nagoya/JP, 3Otawara-shi, Tochigi/JP
Disclosures:
Saeko Mochinaga: Nothing to disclose
Keiichi Nomura: Nothing to disclose
Keisuke Fujii: Nothing to disclose
ken hirayama: Nothing to disclose
Hiroki Taguchi: Employee: Canon Medical Systems Corporation
Yoshihisa Muramatsu: Nothing to disclose
Tatsushi Kobayashi: Nothing to disclose
Keywords: Radiation physics, Radiographers, CT, CT-Quantitative, Physics, Quality assurance
Purpose In recent years, novel computed tomography (CT) systems with semiconductor-based photon counting detectors have been actively researched and developed [1], [2], [3]. Photon counting detectors have many advantages over conventional scintillation detectors, and have been reported to significantly improve dose-utilization efficiency, image contrast, and resolution [3], [4], [5], [6]. In addition, image noise reduction or radiation exposure reduction has been achieved [6], [7]. While dual energy CT has been commonly used for spectral analysis, in PCD-CT, it is possible to...
Read more Methods and materials The phantom used in this study was the Catphan600-CTP404 (Phantom Laboratory, NY, USA). As shown in Fig 1, the Catphan600-CTP404 is equipped with eight different modules Air, PMP, LDPE, Water, Polystyrene, Acrylic, Delrin, and Teflon. Each module consists of a cylinder, with an actual diameter of approximately 13 mm and a length of 25 mm along the z-axis. This phantom was scanned using the clinical research CZT-based PCD-CT (TSX-501R, Canon Medical Systems, Otawara, Japan) with the following scanning conditions. Tube...
Read more Results The nominal values of electron density listed in the phantom data sheets were 0.004, 2.851, 3.160, 3.343, 3.335, 3.833, 4.557, 6.243 (10^23 e/cm^3) for Air, PMP, LDPE, Water, Polystyrene, Acrylic, Delrin, and Teflon respectively. Tables 1 and 2 show the absolute and relative errors between the nominal and calculated values. The absolute errors for PMP, LDPE, Water, Polystyrene, Acrylic, and Delrin, excluding Air and Teflon, were within 0.066 (10^23 e/cm^3), and the relative errors were within 1.98%. The electron density...
Read more Conclusion This is the first study to evaluate the electron density value calculated from spectral data obtained using CZT-based PCD-CT. When the calculated values were compared with the nominal values, the electron density value was quantified with particularly high accuracy for materials with electron density value from about 3 to 5 (10^23 e/cm^3) and CT value from -200 to 400 HU. The results of the evaluation of four different tube currents of 50, 100, 200, and 250 mA showed that the...
Read more References [1] Persson, M., Huber, B., Karlsson, S., et al. Energy-resolved CT imaging with a photon-counting silicon-strip detector. Phys. Med. Biol. 2014;59(22):6709–6727.[2] Taguchi, K., Iwanczyk, JS. Vision 20/20: Single photon counting x-ray detectors in medical imaging. Med. Phys. 2013;40(10):100901.[3] Gutjahr, R., Halaweish, AF., Yu, Z., et al. Human imaging with photon-counting-based CT at clinical dose levels: Contrast-to-noise ratio and cadaver studies. Invest Radiol. 2016;51(7):421–429.[4] Zhan, X., Zhang, R., Niu, X., et al. Comprehensive evaluations of a Prototype Full Field-of-View Photon Counting...
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