Cardiac material markers from tagged MR images.

Cardiac material markers from tagged MR images.
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来自标记 MR 图像的心脏材料标记。

DOI:
10.1016/s1361-8415(98)80015-7
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发表时间:
1998
期刊:
Medical image analysis.
影响因子:
--
通讯作者:
Prince,JL
Prince,JL
中科院分区:
--
文献类型:
--
作者:
Kerwin,WS;Prince,JL

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标记磁共振成像(MRI)在心脏运动的无创分析中显示出巨大的前景。然而,为了取代植入标记作为金标准,标记MRI必须能够高精度地跟踪稀疏的材料点集,即所谓的材料标记。本文提出了一种新的方法,用于生成精确的运动估计稀疏的一组材料点使用标准的,并行标记的MR图像。跟踪点位于三个标记表面的交点处,每个标记表面都使用薄板样条来估计。的交叉点是由迭代交替投影算法的收敛性证明。所得数据集与开发用于利用植入标记数据的应用程序兼容。使用多种方法对来自正常人类志愿者的一组这些材料标记进行详细检查,以使标记可视化。数值结果,包括额外的研究进行了讨论。最后,使用计算机模拟的左心室进行误差分析,对于典型的成像参数和噪声水平,跟踪材料标记的RMS误差接近0.2 mm。
Tagged magnetic resonance imaging (MRI) has shown great promise in noninvasive analysis of heart motion. To replace implanted markers as a gold standard, however, tagged MRI must be able to track a sparse set of material points, so-called material markers, with high accuracy. This paper presents a new method for generating accurate motion estimates over a sparse set of material points using standard, parallel-tagged MR images. The tracked points are located at intersections of three tag surfaces, each of which is estimated using a thinplate spline. The intersections are determined by an iterative alternating projections algorithm for which a proof of convergence is provided. The resulting data sets are compatible with applications developed to exploit implanted marker data. One set of these material markers from a normal human volunteer is examined in detail using several methods to visualize the markers. Numerical results that include additional studies are also discussed. Finally, an error analysis is presented using a computer-simulated left ventricle for which material markers are tracked with an RMS error near 0.2 mm for typical imaging parameters and noise levels.
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