Sulieman A, Tammam N, Alzimami K, Elnour A M, Babikir E, Alfuraih A
Radiology and Medical Imaging Department, College of Applied Medical Sciences, Prince Sattam bin Abdulaziz University, Alkharj, Kingdom of Saudi Arabia College of Medical Radiologic Science, Sudan University of Science and Technology, Khartoum, Sudan
College of Medical Radiologic Science, Sudan University of Science and Technology, Khartoum, Sudan.
Radiat Prot Dosimetry. 2015 Jul;165(1-4):185-9. doi: 10.1093/rpd/ncv123. Epub 2015 Apr 1.
Computed tomography (CT) examinations involve relatively high doses to patients. The objectives of this study were to optimise the radiation dose for patient during CT chest scan and to estimate the lifetime cancer risk. A total of 50 patients were studied: control group (A) (38 patients) and optimisation group (B) (12 patients). The optimisation protocol was based on CT pitch increment and lowering tube current. The mean volume CT dose index (CTDI vol) was 21.17 mGy and dose length product (DLP) was 839.0 mGy cm for Group A, and CTDI vol was 8.3 mGy and DLP was 339.7 for Group B. The overall cancer risk was estimated to be 8.0 and 3.0 cancer incidence per million for Groups A and B, respectively. The patient dose optimisation during CT chest was investigated. Lowering tube current and pitch increment achieved a radiation dose reduction of up to 60 % without compromising the diagnostic findings.
计算机断层扫描（CT）检查会给患者带来相对较高的辐射剂量。本研究的目的是优化胸部CT扫描时患者的辐射剂量，并估算终生患癌风险。共对50例患者进行了研究：对照组（A组）（38例患者）和优化组（B组）（12例患者）。优化方案基于CT螺距增加和管电流降低。A组的平均容积CT剂量指数（CTDI vol）为21.17 mGy，剂量长度乘积（DLP）为839.0 mGy·cm；B组的CTDI vol为8.3 mGy，DLP为339.7。A组和B组的总体患癌风险估计分别为每百万8.0例和3.0例癌症发病率。对胸部CT检查期间的患者剂量优化进行了研究。降低管电流和增加螺距可在不影响诊断结果的情况下使辐射剂量降低高达60%。
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