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Clinical application of reconstructed three dimensional magnetic resonance imaging in cardiovascular diseases.

重建三维磁共振成像在心血管疾病中的临床应用

基本信息

批准号：
09670769
负责人：
KOITO Hitoshi
金额：
$ 1.98万
依托单位：
Kansai Medical University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09670769/
关键词：
MRI 3D-reconstruction heart great vessel 磁気共鳴画像

项目摘要

To assess the cardiovascular anatomy, we have developed a low cost three dimensional (3D) reconstruction system using magnetic resonance (MR) imaging data on a NeXT workstation. The former version of this system had several problems. It needed many slices to reconstruct the whole heart and great vessels because we used multisectional and multiphasic EGG-gated MR images by the spin-echo technique in the only axial view, It was not able to reconstruct naturally the curved or meandered structures such as the aortic arch and the pulmonary artery. The structures behind other structures were not seen. To conqure these problem, we used axial, coronal and sagittal images to reduced the number of slices in each directional view, improved the moleling technique to reconstruct the curved or meandered structures naturally and applied the partly transparent technique to evaluate the overlapped structures. Determination of spacial location in the data of three axis views were done by entering the number of slices, slice thickness, gap thickness between the slices and the locational data of the first slice in each directional view. In order to improve the modeling, geometric centers of the coutours were connected by a 3D space curve, and the central axis of each cardiac structure was determined. The contours are projected on the perpendicular plane to the central axis and semiautomatically processed until the contours of one pixel are obtained. Then the surface rendering with transparency was performed and the each structures were superimposed. We tried these modified technique in patients with annuloaortic ectasia and corrected transposition of the greatarteries. With these improvement the curved or meandered structures were reconstructed naturally and superimposed structures were evaluated well.As we can reconstruct 3D images well with less number of slices in each directional view, it becomes possible to reconstruct 3D images with using the data of a routine MR examination.

为了评估心血管解剖结构，我们已经开发了一个低成本的三维（3D）重建系统，使用磁共振（MR）成像数据的NeXT工作站。这个系统的前一个版本有几个问题。由于采用自旋回波技术的多切面、多相位门控MR图像，只能在轴位上重建心脏和大血管，需要多个层面，不能自然重建主动脉弓、肺动脉等弯曲或曲折的结构。其他结构后面的结构没有看到。为了解决这些问题，我们采用轴位、冠状位和矢状位图像，减少了每个方向视图的切片数，改进了Moleling技术，自然地重建了弯曲或曲折的结构，并应用部分透明技术来评价重叠结构。通过输入每个方向视图中的切片数、层厚、层间间隙厚度和第一层的位置数据，确定三轴视图数据中的空间位置。为了提高模型的准确性，用三维空间曲线连接各心脏结构的几何中心，确定各心脏结构的中心轴线。将轮廓线投影到与中心轴垂直的平面上，并半自动地处理，直到获得一个像素的轮廓线。然后进行透明的面绘制，并将每个结构叠加。我们尝试这些改良的技术在患者的主动脉瓣环扩张和纠正大动脉转位。通过这些改进，弯曲或曲折的结构被自然地重建，并且重叠结构被很好地评价。由于我们可以在每个方向视图中使用较少的切片数来很好地重建3D图像，因此可以使用常规MR检查的数据来重建3D图像。