Clinic of Pediatric Cardiology, Kiel Univ.
IEEE Trans Med Imaging. 1996;15(4):532-46. doi: 10.1109/42.511756.
The aim of this work is the three-dimensional (3-D) reconstruction of the left or right heart chamber from digital biplane angiograms. The approach used, the binary reconstruction, exploits the density information of subtracted ventriculograms from two orthogonal views in addition to the ventricular contours. The ambiguity of the problem is largely reduced by incorporating a priori knowledge of human ventricles. A model-based reconstruction program is described that is applicable to routinely acquired biplane ventriculographic studies. Prior to reconstruction, several geometric and densitometric imaging errors are corrected. The finding of corresponding density profiles and anatomical landmarks is supported by a biplane image pairing procedure that takes the movement of the gantry system into account. Absolute measurements are based on geometric isocenter calibration and a slice-wise density calibration technique. The reconstructed ventricles allow 3-D visualization and regional wall motion analysis independently of the gantry setting. The method is applied to clinical angiograms and tested in left- and right-ventricular phantoms yielding a well shape conformity even with few model information. The results indicate that volumes of binary reconstructed ventricles are less projection-dependent compared to volume data derived by purely contour-based methods. A limitation is that the heart chamber must not be superimposed by other dye-filled structures in both projections.
本工作旨在从数字式双平面心血管造影中对左或右心室进行三维（3-D）重建。所采用的方法，即二值重建，除了心室轮廓之外，还利用了两个正交视图的减影心室造影的密度信息。通过合并对人体心室的先验知识，在很大程度上减少了问题的歧义性。本文描述了一种适用于常规获取的双平面心室造影研究的基于模型的重建程序。在重建之前，校正了几种几何和密度成像误差。通过双平面图像配对程序，考虑到机架系统的运动，支持相应的密度轮廓和解剖学标志的发现。绝对测量基于几何等中心校准和切片密度校准技术。重建的心室允许独立于机架设置进行 3-D 可视化和局部壁运动分析。该方法应用于临床血管造影，并在左心室和右心室模型中进行了测试，即使模型信息很少，也能很好地符合形状。结果表明，与纯粹基于轮廓的方法获得的体积数据相比，二进制重建心室的体积受投影的依赖性较小。限制条件是，在两个投影中，心脏腔室都不能被其他充满染料的结构所重叠。
