低剂量CT技术在泌尿系结石诊断中的应用价值

发布时间：2018-06-15 19:04

本文选题：泌尿系结石 + 低剂量　；参考：《安徽医科大学学报》2015年11期

【摘要】：目的探讨低剂量CT结合自适应统计迭代重建技术在泌尿系结石诊断中的价值。方法使用自动管电流调节技术,对临床怀疑泌尿系结石的41例患者同时进行常规剂量及低剂量CT扫描,其中常规组噪声指数(NI)设定为13,低剂量组NI设定为25,运用滤过反投影技术(FBP)及自适应统计迭代重建技术(ASIR)对图像进行1.25 mm层厚重建,由两名放射科医师分别对结石(大小、位置、数目)、图像质量(1~5分)、图像噪声(1~3分)及诊断可信度(1~3分)等几个方面进行评估,记录两组扫描的容积CT剂量指数(CTDIvol)、剂量长度乘积(DLP)并计算有效剂量(ED)。采用Wilcoxon符号秩和检验及配对t检验进行统计学分析。结果低剂量组的平均ED为1.76 m Sv,常规组的平均ED为5.98 m Sv(P0.05)。低剂量组使用80%ASIR法处理的图像质量明显高于FBP法处理的图像质量(P0.05),而与常规组FBP法处理的图像质量大致相仿,差异无统计学意义(P0.05)。结论结合使用自动管电流调节技术及ASIR,可在保证图像质量的前提下,明显降低CT扫描辐射剂量,具有较好的临床可行性。
[Abstract]:Objective to evaluate the value of low dose CT combined with adaptive statistical iterative reconstruction in the diagnosis of urinary calculi. Methods 41 patients suspected of urinary calculi were examined by conventional and low dose CT scans with automatic tube current regulation technique. The noise index of conventional group was set to 13, and that of low dose group was set to 25. The image was reconstructed with 1.25 mm slice thickness using filter backprojection technique and adaptive statistical iterative reconstruction technique (ASIRR). The stone size was measured by two radiologists. The location, number, image quality (1 ~ 5), image noise (1 ~ 3) and diagnostic reliability (1 ~ 3) were evaluated. The volume CT dose index (CTDIvoll) and the dose length product (DLP) of the two groups were recorded and the effective dose was calculated. Wilcoxon signed rank sum test and paired t test were used for statistical analysis. Results the average Ed of low dose group was 1.76 m Sv, and the average Ed of routine group was 5.98 m SvP 0.05. The image quality of low dose group treated by 80 and ASIR method was significantly higher than that of FBP method, but the image quality of low dose group was similar to that of conventional FBP method, but the difference was not statistically significant. Conclusion the combination of automatic tube current regulation and ASIRs can obviously reduce the radiation dose of CT scan on the premise of guaranteeing the image quality and has good clinical feasibility.
【作者单位】：安徽医科大学第一附属医院放射科;安徽医科大学第一附属医院泌尿外科;
【基金】：国家自然科学基金青年基金项目(编号:81301224) 安徽省高校省级自然科学研究重点项目(编号:KJ2013A144) 安徽医科大学第一附属医院青年培育基金项目(编号:2012KJ02)
【分类号】：R691.4;R816.7

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