Department of Physics, Faculty of Sciences and Mathematics, Diponegoro University, Jl. Prof. Soedarto SH, Tembalang, Semarang 50275, Central Java, Indonesia.
J Radiol Prot. 2020 Jun;40(2):544-553. doi: 10.1088/1361-6498/ab81a6. Epub 2020 Mar 20.
This paper aims to develop phantoms for measurement of computed tomography dose index (CTDI) based on a polyester resin mixed with methyl ethyl ketone peroxide (MEKP) as catalyst. CT number and CTDI values of the polyester resin phantoms were compared with a standard polymethyl methacrylate (PMMA) phantom as reference. The percentage of MEKP was varied from 0.3 to 0.6 wt%. The polyester resin phantoms had diameter of 160 mm, length of 150 mm and five cylindrical holes with diameter of 13.5 mm. One hole was positioned at the centre of the phantom and the other four near its periphery, 10 mm from the edge. The results show that the CT number of the polyester resin phantom was about 1%-9% higher than that of the standard PMMA phantom. Among the polyester resin phantoms, the one with 0.3 wt% MEKP is closest to the standard PMMA phantom in terms of CT number. In addition, the difference in weighted CTDI value between the 0.3 wt% polyester resin phantom and the PMMA is less than 5%. Thus, the 0.3 wt% polyester resin is potentially used as an alternative to the standard PMMA, with the advantage of a lower cost.
本文旨在开发一种基于聚酯树脂和过氧化甲乙酮（MEKP）作为催化剂的体模，用于测量计算机断层扫描剂量指数（CTDI）。将聚酯树脂体模的 CT 数和 CTDI 值与标准聚甲基丙烯酸甲酯（PMMA）体模进行比较。MEKP 的百分比从 0.3 至 0.6wt%变化。聚酯树脂体模的直径为 160mm，长度为 150mm，有五个直径为 13.5mm 的圆柱形孔。一个孔位于体模的中心，另外四个位于其周边，距边缘 10mm。结果表明，聚酯树脂体模的 CT 数比标准 PMMA 体模高约 1%-9%。在聚酯树脂体模中，MEKP 含量为 0.3wt%的体模在 CT 数方面最接近标准 PMMA 体模。此外，0.3wt%聚酯树脂体模与 PMMA 的加权 CTDI 值差异小于 5%。因此，0.3wt%聚酯树脂具有成本更低的优势，有可能替代标准 PMMA。
