Seifarth Harald, Maintz David, Jürgens Kai-Uwe, Bruder Herbert, Heindel Walter, Fischbach Roman
Department of Clinical Radiology, University of Muenster, Muenster, Germany.
Invest Radiol. 2006 Dec;41(12):898-903. doi: 10.1097/01.rli.0000246123.15947.fc.
We sought to evaluate an electrocardiogram (ECG)-independent image reconstruction technique for coronary computed tomography (CT)-angiography based on cardiac motion.
The raw data from 20 patients was reconstructed with both an ECG-gated algorithm and a motion-dependent algorithm that calculates the cardiac motion-function directly from the CT raw data using a center of mass technique. Images were reconstructed in 5% steps over the R-R interval and the cardiac motion-cycle. For both approaches multiplanar reformations were created and the set of images with the least motion artifacts was used for the evaluation. Motion artifacts affecting the ascending aorta, the left main coronary artery and the entire course of the LAD, LCX and RCA were scored using a 5-point scale.
The mean optimal reconstruction window was at 60% of the R-R interval and 30% of the cardiac motion cycle. A total of 73 of 100 vascular regions showed no motion artifacts in ECG-gated images, with the motion-synchronized algorithm only 41 regions were free of motion artifacts. The mean motion-score was 1.4 (+/-0.6) and 2.4 (+/-1.2) respectively (P < 0.05).
In the currently implemented form the motion-gated algorithm is inferior to ECG-gated image reconstruction but can be used in patients with an incomplete or corrupt ECG-signal.
我们试图评估一种基于心脏运动的冠状动脉计算机断层扫描（CT）血管造影的独立于心电图（ECG）的图像重建技术。
对20例患者的原始数据分别采用心电图门控算法和运动相关算法进行重建，运动相关算法使用质心技术直接从CT原始数据计算心脏运动功能。在R-R间期和心动周期内以5%的步长重建图像。对于这两种方法，均创建多平面重组图像，并使用运动伪影最少的图像集进行评估。使用5分制对影响升主动脉、左冠状动脉主干以及前降支、回旋支和右冠状动脉全程的运动伪影进行评分。
平均最佳重建窗位于R-R间期的60%和心动周期的30%处。在心电图门控图像中，100个血管区域中有73个未出现运动伪影，而运动同步算法仅有41个区域无运动伪影。平均运动评分别为1.4（±0.6）和2.4（±1.2）（P<0.05）。
以目前的实施形式，运动门控算法不如心电图门控图像重建，但可用于心电图信号不完整或损坏的患者。
