Automatic phase determination for retrospectively gated cardiac CT
Automatic phase determination for retrospectively gated cardiac CT
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DOI：
10.1118/1.1791351
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发表时间：
2004-12-01
期刊：
影响因子：
3.8
通讯作者：
Grass, M
中科院分区：
文献类型：
--
作者：
Manzke, R;Köhler, T;Grass, M
CT探测器和机架技术的最新改进与新的心率自适应锥形束重建算法相结合，能够以高空间分辨率实现心脏的三维可视化。然而，有限的时间分辨率仍然阻碍了在心动周期的任意相位处的心脏的无伪影重建。为了获得最高的图像质量，必须找到心脏准平稳的心脏相位。由于周期间和患者间的变异性，找到这些阶段具有挑战性。心电图（ECG）信息并不总是以足够的精度表示心脏运动。在这本书里。引入了一种简单且有效的基于图像的技术，其能够以自动且患者特定的方式传递稳定的心脏相位。从低分辨率的四维数据集。通过计算心动周期中后续相位之间的对象相似性来导出最稳定的相位。关于对象运动的患者特异性信息可以在空间上被确定和解析。该信息用于在小运动阶段执行优化的高分辨率重建。基于模拟研究和三个真实的患者数据集的结果。使用16层锥形束CT系统在低螺距螺旋模式下生成投影数据，并行ECG记录。(C)2004年美国医学物理学家协会。
The recent improvements in CT detector and gantry technology in combination with new heart rate adaptive cone beam reconstruction algorithms enable the visualization of the heart in three dimensions at high spatial resolution. However, the finite temporal resolution still impedes the artifact-free reconstruction of the heart at any arbitrary phase of the cardiac cycle. Cardiac phases must be found during which the heart is quasistationary to obtain outmost image quality. It is challenging to find these phases due to intercycle and patient-to-patient variability. Electrocardiogram (ECG) information does not always represent the heart motion with an adequate accuracy. In this publication. a simple and efficient image-based technique is introduced which is able to deliver stable cardiac phases in an automatic and patient-specific way. From low-resolution four-dimensional data sets. the most stable phases are derived by calculating the object similarity between subsequent phases in the cardiac cycle. Patient-specific information about the object motion can be determined and resolved spatially. This information is used to perform optimized high-resolution reconstructions at phases of little motion. Results based on a Simulation Study and three real patient data sets are presented. The projection data were generated using a 16-slice cone beam CT system in low-pitch helical mode with parallel ECG recording. (C) 2004 American Association of Physicists in Medicine.