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本研究旨在采用动态三维重建技术定量二尖瓣脱垂的部位和范围，为二尖瓣关闭不全手术方式的选择提供形态学依据。研究对象为２１例经手术证实的二尖瓣脱垂患者。结果：２１例二尖瓣脱垂均能立体显示病变瓣膜的形态特征，从左房往左室方向观察，在心脏收缩期。脱垂部位象“伞面”状飘向左心房，与正常瓣膜间有鲜明的边界。三维重建可以明确反映脱垂所累及的部位、瓣叶节段和范围，并定量其横径和纵径。本组中脱垂范围最大者为１２．６ｍｍ×９．７ｍｍ，最小者为２．３ｍｍ×３．８ｍｍ。１４例因脱垂累及范围较大或瓣膜质地较坚硬，而行瓣膜置换术；７例因脱垂累及的范围较小而行瓣膜修复术。结论：三维重建超声显像能够正确定量二尖瓣脱垂的部位和范围，是诊断二尖瓣脱垂最有效的新方法
This study aimed to quantify the location and extent of mitral valve prolapse using dynamic three-dimensional reconstruction technology, providing a morphological basis for the selection of mitral regurgitation. The study was performed on 21 surgically confirmed patients with mitral valve prolapse. RESULTS: Twenty-one cases of mitral valve prolapse could display the morphological features of diseased valves stereotacticly. From left atrium to the left ventricle, they were observed during systole. Prolapsed parts like “umbrella” floating toward the left atrium, and the normal valve has a clear border between. Three-dimensional reconstruction can clearly reflect the prolapse involved parts, leaflet segments and scope, and quantify its diameter and longitudinal diameter. The largest group of prolapse in the range of 12.6mm × 9.7mm, the smallest of 2.3mm × 3.8mm. Fourteen cases were treated with valvular replacement because of the larger extent of prolapse or the harder valve texture. Seven cases had valve repair due to the lesser extent of prolapse. Conclusion: Three-dimensional reconstruction of ultrasound imaging can correctly quantify the location and extent of mitral valve prolapse and is the most effective new method for the diagnosis of mitral valve prolapse