Ricci C, Longo R, Pagnan L, Pinamonti B
Istituto di Radiologia, Università di Trieste.
Radiol Med. 1991 Apr;81(4):433-40.
MR imaging is the only non-invasive tomographic imaging modality capable of imaging the heart along planes that are parallel to each other and in any desired direction. Such reconstruction algorithms can thus be applied to MR images as the Simpson's rule which allows volume estimation of all cardiac cavities, although very irregular in shape, like the right ventricle. The authors optimized the technical parameters to obtain a set of multiphase double-angulated images on both the short and the long axes of the heart, in about 1-hour time. This technique was used to examine 31 patients suffering from several cardiopathies. The images allowed both end-diastolic and end-systolic volumes to be estimated, as well as the ejection fractions of both ventricles. In the left ventricle the area-length method and the Simpson's rule were applied, whereas only the latter was employed in the right ventricle. The correlation coefficients of US and MR data were, for the 3 parameters, r = 0.813, r = 0.920, and r = 0.879, respectively, in the first case, and r = 0.905, r = 0.923, and r = 0.890 in the second one. The time required to analyze the obtained data, which is done manually, is still considerably long.
磁共振成像（MR成像）是唯一一种非侵入性断层成像方式，能够沿着相互平行且任意所需方向的平面来对心脏进行成像。因此，诸如辛普森法则这样的重建算法可应用于MR图像，该法则能够对所有心腔进行容积估计，即便其形状非常不规则，比如右心室。作者优化了技术参数，以便在大约1小时的时间内，获取心脏短轴和长轴上的一组多期双角度图像。这项技术被用于检查31名患有多种心脏病的患者。这些图像能够估计舒张末期和收缩末期容积，以及两个心室的射血分数。对于左心室，应用了面积-长度法和辛普森法则，而右心室仅采用了后者。在第一种情况下，超声（US）和MR数据在这3个参数上的相关系数分别为r = 0.813、r = 0.920和r = 0.879，在第二种情况下分别为r = 0.905、r = 0.923和r = 0.890。手动分析所获数据所需的时间仍然相当长。
