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

机译:使用自适应迭代减量3维的小剂量计算机断层造影术:与常规滤过背投影的计算机断层摄影术的比较

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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.
机译:目的:本研究旨在评估采用自适应迭代减量3维(AIDR 3D)技术的低剂量计算机断层扫描(CT)尿路造影与采用过滤反投影(FBP)的常规剂量CT相比的图像质量。方法:30例患者在CT尿路造影的肾脏和排泄阶段接受低剂量和常规剂量的CT扫描。用AIDR 3D重建低剂量CT,并用FBP重建常规剂量CT。在定量分析中,在两次CT扫描中都测量了肾皮质,主动脉,腹膜后脂肪和腰肌的图像噪声,并进行了比较。在两次CT扫描中都对泌尿系统进行了定性分析并进行了比较。这些结果是根据患者的体重指数(BMI)进行比较的。测量CT剂量指数(CTDIvol),并计算剂量减少。结果:在定量分析中,与患者的BMI无关,低剂量CT的所有器官在两个阶段的图像噪声均小于常规剂量CT的图像噪声。低剂量和常规剂量CT在两个阶段对所有泌尿系统的诊断可接受性均无统计学差异,与患者的BMI无关。常规剂量CT的平均CTDIvol在肾脏造影阶段为14.5 mG​​y,在排泄阶段为9.2 mGy。低剂量CT的平均CTDIvol在肾脏造影阶段为4.2 mGy,在排泄阶段为2.7 mGy。结论:使用AIDR 3D的低剂量CT尿路造影可以提供与常规剂量的FBP CT尿路造影相当的诊断可接受性,且剂量减少约70%。

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