Dong Jian, Wang Xiaoying, Jiang Xuexiang, Gao Li, Li Feiyu, Qiu Jianxing, Xu Yufeng, Wang He
Department of Radiology, Peking University First Hospital, Beijing, China.
J Comput Assist Tomogr. 2013 Jul-Aug;37(4):618-25. doi: 10.1097/RCT.0b013e31828f5020.
This study aimed to retrospectively evaluate the feasibility and reliability of low-contrast agent dose dual-energy computed tomography (DECT) monochromatic imaging in pulmonary angiography.
Computed tomography pulmonary angiography was performed in 86 patients, 41 in 120-kVp computed tomography (CT) and 45 in DECT with low-contrast agent dose. The images in DECT were reconstructed at optimal kiloelectron-voltage (keV), demonstrating the best contrast-to-noise ratio between pulmonary artery and soft tissue, and at 70 keV. Image quality was compared by quantitative and subjective indexes. The radiation doses were recorded.
Compared with 120-kVp CT, optimal keV showed superior quantitative indexes with inferior subjective image quality, whereas 70 keV demonstrated no statistical difference in quantitative indexes with superior subjective image quality. All suspicious pulmonary embolisms in DECT were diagnosed confidently by combination of 2 kinds of monochromatic imaging. The radiation dose in DECT is almost twice as 120-kVp CT.
Low-contrast agent dose DECT monochromatic imaging in pulmonary angiography accommodates superior intravascular enhancement and contrast in pulmonary arteries, and improves diagnostic confidence with compatible radiation dose.
本研究旨在回顾性评估低对比剂剂量双能计算机断层扫描（DECT）单色成像在肺血管造影中的可行性和可靠性。
对86例患者进行了计算机断层扫描肺血管造影，其中41例采用120 kVp计算机断层扫描（CT），45例采用低对比剂剂量的DECT。DECT图像在最佳千电子伏特（keV）下重建，显示肺动脉与软组织之间最佳的对比噪声比，并在70 keV下重建。通过定量和主观指标比较图像质量。记录辐射剂量。
与120 kVp CT相比，最佳keV显示出更好的定量指标，但主观图像质量较差，而70 keV在定量指标上无统计学差异，但主观图像质量更好。DECT中所有可疑肺栓塞均通过两种单色成像的组合得以确诊。DECT的辐射剂量几乎是120 kVp CT的两倍。
低对比剂剂量DECT单色成像在肺血管造影中可实现更好的血管内强化和肺动脉对比，并在兼容的辐射剂量下提高诊断可信度。
