Non-Electrocardiogram-Triggered 70-kVp High-Pitch Computed Tomography Angiography of the Whole Aorta With Iterative Reconstruction: Initial Results

作者：Zhang, Long Jiang^*; Li, Xie; Schoepf, U. Joseph; Wichmann, Julian L.; Tang, Chun Xiang; Zhou, Chang Sheng; Lu, Guang Ming

来源：Journal of Computer Assisted Tomography, 2016, 40(1): 109-117.

DOI：10.1097/RCT.0000000000000329

• aorta
• CT angiography
• high pitch
• radiation dose
• contrast agent

Objectives: To evaluate the feasibility of non electrocardiogram (ECG) triggered 70-kVp high-pitch aortic computed tomogaphy angiography (CIA) with iterative reconstruction (IR) and reduced contrast agent using second-generation dual-source CT (DSCT). @@@ Methods: Seventy-seven patients were examined: group A (n = 21), 70-kVp high-pitch (3.2) CTA, 60 mL contrast agent and IR on second generation DSCT; group B (n = 29), standard-pitch (1.2) CTA, automatic tube voltage selection, filtered back projection and 80 mL contrast agent on second-generation DSCT; group C (n = 27), 120-kVp standard-pitch (1.2) CTA, filtered back projection, and 80 mL contrast agent on first generation DSCT. Computed tomography values, noise, signal-to-noise ratio, contrast-to-noise ratio, and subjective image quality were compared. @@@ Results: Computed tomography values and noise of all aortic segments in group A were increased compared with groups B and C (P < 0.05). Group B showed the highest signal-to-noise ratio and contrast-to-noise ratio for all aortic segments (P < 0.05), whereas no significant differences were found between groups A and C (P > 0.05). Mean effective dose was 0.88 +/- 0.08 mSv for group A, reduced by 93% compared to group C and by 90% compared to group B. @@@ Conclusions: Non ECG-triggered 70-kVp high-pitch aortic CTA with IR provides equivalent diagnostic image quality with 90% reduction of radiation dose and 25% reduction of contrast volume compared with standard 120-kVp CTA.

• 出版日期2016-1
• 单位南京大学