Electrocardiogram-correlated image reconstruction from subsecond spiral computed tomography scans of the heart
Electrocardiogram-correlated image reconstruction from subsecond spiral computed tomography scans of the heart
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DOI：
10.1118/1.598453
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发表时间：
1998-12-01
期刊：
影响因子：
3.8
通讯作者：
Kalender, WA
中科院分区：
文献类型：
--
作者：
Kachelriess, M;Kalender, WA
亚秒计算机断层扫描（CT）扫描提供了改善心脏成像的潜力。因此，我们开发并验证了专用重建算法，用于利用心电图（ECG）信息通过亚秒螺旋CT对心脏进行成像。在亚秒级螺旋CT扫描仪上对螺旋CT z插值算法进行了改进。研究了两类新的算法：（a）摄氏180度（心内插），属于相同心脏相位的相邻螺旋数据段之间的分段线性内插，其中通过与同时记录的ECG信号相关来选择段，以及（B）180度CD（心脏三角），180度+三角的部分扫描重建，三角<扇形角，导致有效扫描时间减少到0.5秒以下。计算机模拟以及处理的临床数据收集与0.75秒的扫描时间进行评估这些新的方法。180度CI和180度CD都提供了图像质量的显著改善。与标准螺旋重建相比，重建图像中的运动伪影大大减少;特别是，冠状动脉钙化的轮廓更清晰，多平面重建显示出更好的连续性。然而，在图像平面中引入了新的伪影，主要是由于不同数据段的组合。以心电图为导向的图像重建技术显著提高了螺旋CT心脏成像的质量。图像质量和冠状动脉钙化的显示似乎足以评估冠状动脉钙测量与传统的亚秒级螺旋CT。(C)1998年美国医学物理学家协会。[S0094-2405（98）00712-3]。
Subsecond computed tomography (CT) scanning offers potential for improved heart imaging. We therefore developed and validated dedicated reconstruction algorithms for imaging the heart with subsecond spiral CT utilizing electrocardiogram (ECG) information. We modified spiral CT z-interpolation algorithms on a subsecond spiral CT scanner. Two new classes of algorithms were investigated: (a) 180 degrees CI (cardio interpolation), a piecewise linear interpolation between adjacent spiral data segments belonging to the same heart phase where segments are selected by correlation with the simultaneously recorded ECG signal and (b) 180 degrees CD (cardio delta), a partial scan reconstruction of 180 degrees + delta with delta< fan angle, resulting in reduced effective scan times of less than 0.5 s. Computer simulations as well as processing of clinical data collected with 0.75 s scan time were carried out to evaluate these new approaches. Both 180 degrees CI and 180 degrees CD provided significant improvements in image quality. Motion artifacts in the reconstructed images were largely reduced as compared to standard spiral reconstructions; in particular, coronary calcifications were delineated more sharply and multiplanar reformations showed improved contiguity. However, new artifacts in the image plane are introduced, mostly due to the combination of different data segments. ECG-oriented image reconstructions improve the quality of heart imaging with spiral CT significantly. Image quality and the display of coronary calcification appear adequate to assess coronary calcium measurements with conventional subsecond spiral CT. (C) 1998 American Association of Physicists in Medicine. [S0094-2405(98)00712-3].