Okuda Koichi, Nosaka Hiroki, Ito Toshimune, Matsutomo Norikazu, Ichikawa Hajime, Shirakawa Seiji, Yamaki Noriyasu, Kikuchi Akihiro, Tsushima Hiroyuki, Ljungberg Michael
Department of Physics, Kanazawa Medical University.
Clinical Imaging Center for Healthcare, Nippon Medical School.
Nihon Hoshasen Gijutsu Gakkai Zasshi. 2021;77(1):41-47. doi: 10.6009/jjrt.2021_JSRT_77.1.41.
Validation study of simulation codes was performed based on the measurement of a sphere phantom and the National Electrical Manufacturers Association (NEMA) body phantoms. SIMIND and Prominence Processor were used for the simulation. Both source and density maps were generated using the characteristics of Tc energy. A full width at half maximum (FWHM) of the sphere phantom was measured and simulated. Simulated recovery coefficient and the background count coefficient of variation were also compared with the measured values in the body phantom study. When the two simulation codes were compared with actual measurements, maximum relative errors of FWHM values were 3.6% for Prominence Processor and -10.0% for SIMIND. The maximum relative errors of relative recovery coefficients exhibited 11.8% for Prominence Processor and -2.0% for SIMIND in the body phantom study. The coefficients of variation of the SPECT count in the background were significantly different among the measurement and two simulation codes. The simulated FWHM values and recovery coefficients paralleled measured results. However, the noise characteristic differed among actual measurements and two simulation codes in the background count statistics.
基于球体模体和美国国家电气制造商协会（NEMA）体模的测量结果，对模拟代码进行了验证研究。使用SIMIND和Prominence处理器进行模拟。利用锝能量的特性生成源图和密度图。测量并模拟了球体模体的半高宽（FWHM）。在体模研究中，还将模拟的恢复系数和背景计数变异系数与测量值进行了比较。当将这两个模拟代码与实际测量值进行比较时，Prominence处理器的FWHM值最大相对误差为3.6%，SIMIND为-10.0%。在体模研究中，Prominence处理器的相对恢复系数最大相对误差为11.8%，SIMIND为-2.0%。测量值与两个模拟代码之间，背景中SPECT计数的变异系数存在显著差异。模拟的FWHM值和恢复系数与测量结果平行。然而，在背景计数统计中，实际测量值与两个模拟代码的噪声特性有所不同。
