Study on CT Radiation Dose and Image Quality of PET/CT Based on Optimized CT Scanning
Parameters According to the Weight
CHEN Zhen, CHEN Ziqian, ZHONG Qun, XIAO Hui, XU Shangwen, FU Liyuan, TAO Chaochao
Medical Imaging Center, 900 Hospital of the Joint Logistics Team (The Former Fuzhou General Hospital of Nanjing Military
Command), Fuzhou Fujian 350025, China
Abstract：Objective To investigate the effects of different scanning conditions of CT on radiation dose and image quality in PET/
CT. Methods A total of 60 tumor patients receiving 18F-FDG PET/CT examination were collected, including 30 patients with body
≤ 60 kg and 30 patients with body > 60 kg, respectively. They were divided into two groups according to CT scanning conditions,
30 cases in the conventional CT condition group and 30 cases in the optimized CT condition group. The two groups were prepared
in the same way before the examination. The effective PET dose (ED18F-FDG) and CT radiation dose were measured in both groups.
The CT radiation dose were dose length product (DLP) and CT volume dose index (CTDIvol), image contrast noise ratio (CNR)
were calculated, and visual feature grading (VGC) 5 level scoring system was used to evaluate the image quality of the two groups.
Results Compared with the routine group, the effective dose index of DLP and CTDIvol in optimized group were significantly lower
(P<0.05), and there was no significant difference between ED18F-FDG and CNR (P>0.05). The image quality of the two groups all met
the diagnostic requirements, and there was no significant difference in the average score of image quality (P>0.05), and there was
no significant difference in the grading distribution of image quality score (P>0.05). Conclusion Optimized CT scanning conditions
based on body mass can reduce the CT radiation dose of PET/CT without reducing the image quality.
陈振，陈自谦，钟群，肖慧，许尚文，付丽媛，陶超超. 基于体重优化CT扫描条件对PET/CT成像的CT辐射剂量与图像质量的影响研究[J]. 中国医疗设备, 2019, 34(2): 25-27.
CHEN Zhen, CHEN Ziqian, ZHONG Qun, XIAO Hui, XU Shangwen, FU Liyuan, TAO Chaochao. Study on CT Radiation Dose and Image Quality of PET/CT Based on Optimized CT Scanning
Parameters According to the Weight. China Medical Devices, 2019, 34(2): 25-27.
