Liu Ying, Xu Jian, Li Jian, Ren Jing, Liu Hongtao, Xu Junqing, Wei Mengqi, Hao Yuewen, Zheng Minwen
Department of Radiology, Xijing Hospital, Fourth Military Medical University, 169 West Changle Road, Xi'an 710032, China.
J Cardiothorac Surg. 2013 Dec 12;8:228. doi: 10.1186/1749-8090-8-228.
Aortic dissection is a lift-threatening medical emergency associated with high rates of morbidity and mortality. The incidence rate of aortic dissection is estimated at 5 to 30 per 1 million people per year. The prompt and correct diagnosis of aortic dissection is critical. This study was to compare the ascending aortic image quality and the whole aortic radiation dose of high-pitch dual-source CT angiography and conventional dual-source CT angiography.
A total of 110 consecutive patients with suspected aortic dissection and other aortic disorders were randomly divided into two groups. Group A underwent traditional scan mode and Group B underwent high-pitch dual-source CT scan mode. The image quality and radiation dose of two groups were compared.
Close interobserver agreement was found for image quality scores (κ = 0.87). The image quality of ascending aorta was significantly better in the high-pitch group than in the conventional group (2.78 ± 0.46 vs 1.57 ± 0.43, P < 0.001). There was no significant difference of the CT attenuation values, the aortic image noise and SNR between two groups. The mean radiation dose of high-pitch group was also significantly lower than that of conventional group (2.7 ± 0.6 mSv vs. 3.9 ± 0.9 mSv, P < 0.001).
High-pitch dual-source CT angiography of the whole aorta can provide motion-artifact-free imaging of the ascending aorta at a low radiation dose compared to conventional protocol.
主动脉夹层是一种危及生命的医学急症，其发病率和死亡率很高。据估计，主动脉夹层的发病率为每年每100万人中有5至30例。及时、正确地诊断主动脉夹层至关重要。本研究旨在比较高螺距双源CT血管造影和传统双源CT血管造影的升主动脉图像质量和全主动脉辐射剂量。
将110例连续的疑似主动脉夹层和其他主动脉疾病患者随机分为两组。A组采用传统扫描模式，B组采用高螺距双源CT扫描模式。比较两组的图像质量和辐射剂量。
图像质量评分的观察者间一致性良好（κ = 0.87）。高螺距组升主动脉的图像质量明显优于传统组（2.78±0.46 vs 1.57±0.43，P < 0.001）。两组之间的CT衰减值、主动脉图像噪声和SNR无显著差异。高螺距组的平均辐射剂量也明显低于传统组（2.7±0.6 mSv vs. 3.9±0.9 mSv，P < 0.001）。
与传统方案相比，全主动脉高螺距双源CT血管造影可以在低辐射剂量下提供无运动伪影的升主动脉成像。
