Initial Experience With Adaptive Iterative Dose Reduction 3D to Reduce Radiation Dose in Computed Tomographic Urography
Initial Experience With Adaptive Iterative Dose Reduction 3D to Reduce Radiation Dose in Computed Tomographic Urography
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DOI：
10.1097/rct.0b013e3182742c0e
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发表时间：
2013-01-01
影响因子：
1.3
通讯作者：
Narumi, Yoshifumi
中科院分区：
文献类型：
--
作者：
Juri, Hiroshi;Matsuki, Mitsuru;Narumi, Yoshifumi
目的：方法：30例患者在CT尿路造影的排泄期分别行常规剂量的滤波反投影扫描和低剂量的自适应迭代剂量减少3D（AIDR 3D）扫描。对内部图像噪声、清晰度、条纹伪影和诊断可接受性进行目视评价。定量测量的图像噪声和辐射剂量也得到了。结果：在视觉评价时，低剂量CT轴位和冠状位图像上膀胱条纹伪影明显弱于常规剂量CT（P < 0.001和P = 0.01）。常规剂量CT与低剂量CT在所有结构的其他评价项目上均无统计学差异。低剂量CT的图像噪声低于常规剂量CT（P < 0.001）。所有患者的总体平均剂量降低为45.0%。BMI小于20、20 ~ 25、大于25 kg/m2的患者的平均剂量减少分别为43.0%、44.0%和49.6%.Conclusion：低剂量CT尿路造影AIDR 3D可减少45%的辐射剂量，而排泄期图像质量不受BMI影响。
Objective: This study aimed to investigate the feasibility of low-dose computed tomographic (CT) urography with adaptive iterative dose reduction 3D (AIDR 3D).Methods: Thirty patients underwent routine-dose CT scans with filtered back projection and low-dose CT scans with AIDR 3D in the excretory phase of CT urography. Visual evaluations were performed with respect to internal image noises, sharpness, streak artifacts, and diagnostic acceptability. Quantitative measures of the image noise and radiation dose were also obtained. All results were compared on the basis of body mass index (BMI).Results: At visual evaluations, streak artifacts in the urinary bladder were statistically weaker on low-dose CT than on routine-dose CT in the axial and coronal images (P < 0.001 and P = 0.01). There were no statistical differences between routine-dose CT and low-dose CT for other evaluation items in all structures. Image noise was lower on low-dose CT than on routine-dose CT in all structures (P < 0.001). The overall average dose reduction was 45.0% in all patients. The average dose reduction for the patients with a BMI of less than 20, 20 to 25, greater than 25 kg/m(2) was 43.0%, 44.0%, and 49.6%, respectively.Conclusion: Low-dose CT urography with AIDR 3D allows 45% reduction of radiation dose without degenerating of the image quality in the excretory phase independently to a BMI.