中文摘要：

目的：利用女性盆底磁共振成像（MRI）图像，建立子宫脱垂患者盆底结构三维重建模型，探讨子宫脱垂患者盆底MRI三维影像特征及临床意义。方法：选取2013年9月至2014年6月子宫脱垂患者30例为研究组（脱垂组），选取健康女性20例为对照组，于静息位和Valsalva动作时行盆底MRI扫描。利用Amira商业软件，对MRI图像进行分析及3D建模。结果：建立了两组盆底结构的3D模型。脱垂组与对照组比较：静息位和Valsalva动作时的PCL、H线、G1角、G2角、宫颈长度差异均无统计学意义（P〉0．05）；M线、C线差异均有统计学意义（P〈0．05）；B线静息位时差异无统计学意义（P〉0．05），Valsalva动作时差异有统计学意义（P〈0．05）。两组静息位和Valsalva动作时差值比较：两组的PCL长度差值均无统计学意义（P〉0．05）；M线、G1角、G2角、B线、C线的差值有统计学意义（P〈0．05）；H线对照组的差值有统计学意义（P〈0．05），脱垂组的差值无统计学意义（P〉0．05）。结论：MRI能清楚显示盆底结构，H线、M线、G1角、G2角可衡量盆腔器官脱垂的程度；其构建的3D模型能直观显示各结构的空间毗邻关系，可评价复杂的盆底缺陷，有利于制定个体化手术方案，进行盆底解剖教学及生物力学研究。

英文摘要：

Objective： By MRI images of female pelvic floor,to establish three-dimensionally（3D） model of pel- vic floor structure of patients with uterine prolapse ,and to discus its MRI 3D imaging features and its clinical signif- icance. Methods： 30 patients with uterine prolapse were chosen as prolapse group and 20 cases of healthy women were chosen as control group in September 2013 to June 2014, MRI was performed on relaxation and Valsalva maneuver in all the patients in with the two groups. The MRI images were analyzed and 3D models were created using Amira commercial software. Results：3D models of two groups of pelvic floor structures were suc- cessfully established ,two phase were compared between prolapse group and control group ：there was no signifi- cant difference on PCL, H line, G1 angle, G2 angle, cervical length （ P 〉 0.05）, and there was significant difference on M lines, C lines （ P 〈 0.05） ; there was no significant difference during relaxation （ P 〉 0. 05 ）, there was signifi- cant difference during Valsalva maneuver between the two group（P〈0.05） in B line;difference value were com- pared between relaxation and Valsava maneuver within one group respectively： there was no significant differ- ences in PCL （ P 〉 0.05） in both groups, but there was significant difference on M line, G1 angle, G2 angle, B line, C line in both groups（ P 〈 0.05） ;there was significant difference on H line in control group（ P 〈0. 05）and no significant difference on H line in prolapse group（ P 〉 0.05）. Conclusions： MRI can show the pelvic floor struc- tures clearly,and measuring H line,M line,G1 angle,G2 angle are good method to assess uterine prolapse. 3D reconstructed model of pelvic floor organs can show the spacial relationship of the structures intuitively, and can evaluate the complicated pelvic floor defect,which can help to develop individual operation plan ,and can be applied to pelvic clinical anatomy teaching and biomechanics study.