Radiation Optimized Dual-source Dual-energy Computed Tomography Pulmonary Angiography: Intra-individual and Inter-individual Comparison

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• 作者：Xie Li ; MS^a ; Guo Zhong Chen ; MS^a ; Yan E. Zhao ; MD^a ; U. Joseph Schoepf ; MD^a ; ^b ; Moritz H. Albrecht ; MD^b ; Matthew W. Bickford ; MD^b ; Hai Feng Gu ; BA^a ; Long Jiang Zhang ; MD ; PhD^a ; ^{kevinzhlj@163.com} ; Guang Ming Lu ; MD^a ; ^{cjr.luguangming@vip.163.com}
• 关键词：Dual-energy CT ; pulmonary embolism ; image quality ; radiation dose ; diagnostic accuracy
• 刊名：Academic Radiology
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：24
• 期：1
• 页码：13-21
• 全文大小：1856 K
• 卷排序：24

文摘

This study aimed to intra-individually and inter-individually compare image quality, radiation dose, and diagnostic accuracy of dual-source dual-energy computed tomography pulmonary angiography (CTPA) protocols in patients with suspected pulmonary embolism (PE).MethodsThirty-three patients with suspected PE underwent initial and follow-up dual-energy CTPA at 80/Sn140 kVp (group A) or 100/Sn140 kVp (group B), which were assigned based on tube voltages. Subjective and objective CTPA image quality and lung perfusion map image quality were evaluated. Diagnostic accuracies of CTPA and perfusion maps were assessed by two radiologists independently. Effective dose (ED) was calculated and compared.ResultsMean computed tomography (CT) values of pulmonary arteries were higher in group A than group B (P = .006). There was no difference in signal-to-noise ratio and contrast-to-noise ratio between the two groups (both P > .05). Interobserver agreement for evaluating subjective image quality of CTPA and color-coded perfusion images was either good (κ = 0.784) or excellent (κ = 0.887). Perfusion defect scores and diagnostic accuracy of CTPA showed no difference between both groups (both P > .05). Effective dose of group A was reduced by 45.8% compared to group B (P < .001).ConclusionsSecond-generation dual-source dual-energy CTPA with 80/Sn140 kVp allows for sufficient image quality and diagnostic accuracy for detecting PE while substantially reducing radiation dose.