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Comparison of image uniformity with photon counting and conventional scintillation single photon emission computed tomography system: A monte carlo simulation study

In this study, we compared a PCD and conventional scintillation detector with respect to the energy windows (5%, 10%, 15%, and 20%) using a 99mTc gamma source with a Geant4 Application for Tomography Emission simulation tool. The gamma camera systems used in this work are a CZT PCD and NaI(Tl) conventional scintillation detector with a 1-mm thickness. According to the results, although the IU and DU results were improved with the energy window, the SF and CNR results deteriorated with the energy window. | Comparison of image uniformity with photon counting and conventional scintillation single photon emission computed tomography system: A monte carlo simulation study N u c l e a r E n g i n e e r i n g a n d T e c h n o l o g y 4 9 ( 2 0 1 7 ) 7 7 6 e7 8 0 Available online at ScienceDirect Nuclear Engineering and Technology journal homepage: www.elsevier.com/locate/net Original Article Comparison of Image Uniformity with Photon Counting and Conventional Scintillation Single-Photon Emission Computed Tomography System: A Monte Carlo Simulation Study Ho Chul Kim a, Hee-Joung Kim b, Kyuseok Kim b, Min-Hee Lee c, and Youngjin Lee a,* a Department of Radiological Science, Eulji University, 553, Sanseong-daero, Seongnam-si, Gyeonggi-do, 13135, South Korea b Department of Radiological Science, Yonsei University, 1, Yonseidae-gil, Wonju-si, 26493, South Korea c Department of Biomedical Engineering, Yonsei University, 1, Yonseidae-gil, Wonju-si, 26493, South Korea article info abstract Article history: To avoid imaging artifacts and interpretation mistakes, an improvement of the uniformity Received 3 June 2016 in gamma camera systems is a very important point. We can expect excellent uniformity Received in revised form using cadmium zinc telluride (CZT) photon counting detector (PCD) because of the direct 11 October 2016 conversion of the gamma rays energy into electrons. In addition, the uniformity perfor- Accepted 5 December 2016 mance such as integral uniformity (IU), differential uniformity (DU), scatter fraction (SF), Available online 28 December 2016 and contrast-to-noise ratio (CNR) varies according to the energy window setting. In this study, we compared a PCD and conventional scintillation detector with respect to the 99m Keywords: energy windows (5%, 10%, 15%, and 20%) using a Tc gamma source with a Geant4 Medical Application Application for Tomography Emission simulation tool. The gamma camera systems .