中国医学装备2018，Vol.15Issue(4)：10-13,4.DOI:10.3969/J.ISSN.1672-8270.2018.04.003
CT固定管电流模式下PET-CT受检者的有效剂量研究
Study on the effective dose for patient receiving PET-CT under various fixed tube currents mode
摘要
Abstract
Objective: To research the effective dose for patient receiving PET-CT under fixed tube currents mode so as to provide reference bases for determining optimum clinical scan scheme. Methods: The PET-CT of Discovery Elite was adopted as experiment equipment, and the effective dose of CT scan was obtained from simulated experiment for simulation phantom(Model RS-550). Collected conditions of CT included that the current range of fixed tube was 30-250 mA with an interval of 20 mA, and tube voltage was 120 kV, and screw pitches were 0.984 and 1.375, and the rotate speeds were 0.5 s/R and 0.8s/R. The segmented scan mode that simulated clinical PET-CT was implemented for whole body of phantom. Besides, the dose-length products (DLP) under various scan conditions were recorded, and the effective dose was further calculated. Results: The range of effective dose caused by CT under fixed tube current mode was between 1.05 and 18.99 mSv. And with increasing of current and rotate speed, the effective dose increasing linearly, while with increasing of screw pitches, it decreasing linearly. Conclusion: For a certain patient, there is a noteworthy phenomenon is the difference of effective dose among various collecting conditions was larger under fixed tube current scan mode, and the effective dose of Discovery Elite is lower than that of Discovery ST-16. Therefore, according to different clinical requirement, flexible choosing different CT scan condition that aimed at different machine type can effectively reduce effective dose for patient under the precondition of ensuring image quality.关键词
正电子发射断层扫描-CT/固定管电流/受检者/有效剂量Key words
PET-CT/Fixed tube current/Patient/Effective dose分类
医药卫生引用本文复制引用
梁子威,耿建华,赵葵,王奕斌,杜召猛,毕高畅,齐雍鹤,吴宁,郑容..CT固定管电流模式下PET-CT受检者的有效剂量研究[J].中国医学装备,2018,15(4):10-13,4.基金项目
中国癌症基金会北京希望马拉松专项基金(LC201313和LC201602)"PET/CT的辐射剂量和图像质量的模型研究"和"PET/CT及SPECT、SPECT/CT受检者辐射剂量的研究" （LC201313和LC201602）
国际科技合作项目(2009DF32960)"PET/CT脑分子影像研究与应用平台及针灸中枢机理探索" （2009DF32960）
