Mehdipour Ali, Parsi Masoumeh, Khorram Faezeh-Sadat
Department of Radiology, Faculty of Paramedical, Rafsanjan University of Medical Sciences, PO BOX, Rafsanjan, Iran.
Immunology of Infectious Diseases Research Center, Rafsanjan University of Medical Sciences, Rafsanjan, Iran.
Radiat Prot Dosimetry. 2019 Dec 23;185(2):176-182. doi: 10.1093/rpd/ncy288.
The practical aspects of two recently developed patient dose optimization methods in computed tomography (CT) examinations, size-specific dose estimate (SSDE) and acceptable quality dose (AQD), were verified for the chest and abdomen/pelvis examinations. A dose survey was performed in a CT institute by considering patients lateral diameter, weight and body mass index (BMI). The AQD tables for weight and BMI groups and SSDE threshold curves were obtained. The mean of volume CT dose index and dose length product for standard-size patients were compared with the national diagnostic reference levels (NDRLs) of Iran. The results show that patient doses are below the NDRLs. It is more reliable to report the AQDs based on SSDE and for BMI groups which can well take into account patient size in the dose optimization process. The SSDE threshold curves can be determined with more precision by including dose data of all possible sizes in the curves.
对计算机断层扫描（CT）检查中最近开发的两种患者剂量优化方法，即尺寸特异性剂量估计（SSDE）和可接受质量剂量（AQD）的实际应用，在胸部和腹部/盆腔检查中进行了验证。通过考虑患者的横向直径、体重和体重指数（BMI），在一家CT机构进行了剂量调查。获得了体重和BMI组的AQD表以及SSDE阈值曲线。将标准体型患者的容积CT剂量指数和剂量长度乘积的平均值与伊朗的国家诊断参考水平（NDRLs）进行了比较。结果表明，患者剂量低于NDRLs。基于SSDE并针对BMI组报告AQD更可靠，因为BMI组在剂量优化过程中能很好地考虑患者体型。通过在曲线中纳入所有可能体型的剂量数据，可以更精确地确定SSDE阈值曲线。
