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使用自适应迭代剂量降低三维技术的低剂量计算机断层扫描尿路造影:与常规剂量滤波反投影计算机断层扫描的比较

Low-dose computed tomographic urography using adaptive iterative dose reduction 3-dimensional: comparison with routine-dose computed tomography with filtered back projection.

作者信息

Juri Hiroshi, Matsuki Mitsuru, Inada Yuki, Tsuboyama Takahiro, Kumano Seishi, Azuma Haruhito, Narumi Yoshifumi

机构信息

Department of Radiology, Osaka Medical College, Osaka, Japan.

出版信息

J Comput Assist Tomogr. 2013 May-Jun;37(3):426-31. doi: 10.1097/RCT.0b013e3182830aa9.

Abstract

OBJECTIVE

The aim of this study was to evaluate the image quality of low-dose computed tomographic (CT) urography using adaptive iterative dose reduction 3-dimensional (AIDR 3D) compared with routine-dose CT using filtered back projection (FBP).

METHODS

Thirty patients underwent low- and routine-dose CT scans in the nephrographic and excretory phases of CT urography. Low-dose CT was reconstructed with AIDR 3D, and routine-dose CT was reconstructed with FBP. In quantitative analyses, image noises were measured on the renal cortex, aorta, retroperitoneal fat, and psoas muscle in both CT scans and compared. Qualitative analyses of the urinary system were performed in both CT scans and compared. These results were compared on the basis of the body mass index (BMI) of the patients. The CT dose index (CTDIvol) was measured, and the dose reduction was calculated.

RESULTS

In quantitative analyses, image noises in all organs on low-dose CT were less than those on routine-dose CT in both phases independently of the patient's BMI. There were no statistical differences between low- and routine-dose CT for diagnostic acceptability on all urinary systems in both phases independently of the patient's BMI. The average CTDIvol on routine-dose CT was 14.5 mGy in the nephrographic phase and 9.2 mGy in the excretory phase. The average CTDIvol on low-dose CT was 4.2 mGy in the nephrographic phase and 2.7 mGy in the excretory phase.

CONCLUSIONS

Low-dose CT urography using AIDR 3D can offer diagnostic acceptability comparable with routine-dose CT urography with FBP with approximately 70% dose reduction.

摘要

目的

本研究旨在评估采用自适应迭代剂量降低三维技术(AIDR 3D)的低剂量计算机断层扫描(CT)尿路造影与采用滤波反投影(FBP)的常规剂量CT的图像质量。

方法

30例患者在CT尿路造影的肾实质期和排泄期接受了低剂量和常规剂量CT扫描。低剂量CT采用AIDR 3D重建,常规剂量CT采用FBP重建。在定量分析中,测量并比较了两种CT扫描中肾皮质、主动脉、腹膜后脂肪和腰大肌的图像噪声。对两种CT扫描的泌尿系统进行了定性分析并比较。这些结果根据患者的体重指数(BMI)进行比较。测量CT剂量指数(CTDIvol),并计算剂量降低情况。

结果

在定量分析中,低剂量CT各器官的图像噪声在两个阶段均低于常规剂量CT,且与患者的BMI无关。在两个阶段,低剂量和常规剂量CT在所有泌尿系统的诊断可接受性方面均无统计学差异,且与患者的BMI无关。常规剂量CT在肾实质期的平均CTDIvol为14.5 mGy,在排泄期为9.2 mGy。低剂量CT在肾实质期的平均CTDIvol为4.2 mGy,在排泄期为2.7 mGy。

结论

采用AIDR 3D的低剂量CT尿路造影可提供与采用FBP的常规剂量CT尿路造影相当的诊断可接受性,且剂量降低约70%。

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