基于MRI的健康成年女性肛门括约肌复合体有限元模型  

Finite element model of healthy adult female anal sphincter complex based on MRI

作　　者：余求祥[1,2] 郑丽华[2] 陈正光[1] YU Qiuxiang;ZHENG Lihua;CHEN Zhengguang(Department of Radiology,Dongzhimen Hospital,Beijing University of Chinese Medicine,Beijing 100700,China;Department of Proctology,China-Japan Friendship Hospital,Beijing 100029,China)

机构地区：[1]北京中医药大学东直门医院放射科,北京100700 [2]中日友好医院肛肠科,北京100029

出　　处：《中国医学影像技术》2024年第7期1083-1086,共4页Chinese Journal of Medical Imaging Technology

摘　　要：目的观察基于MRI建立的健康成年女性肛门括约肌复合体(ASC)有限元模型的仿真性。方法前瞻性纳入1名健康成年女性,采用Mimics三维重建软件基于其肛管MRI构建ASC几何模型并将其有限元网格化;参考肛门括约肌离体实验参数及正常人肛门直肠压力数据建立有限元模型,分析其生理特征及应力分布。结果对ASC有限元模型施加边界载荷后,静息态下肛门外括约肌出现收缩形变,肛管最大位移为0.02 mm,肛门内括约肌最大位移更小,且肛管上部内表面正前方存在明显低应力区;力排状态下肛管出现较大扩张形变,肛门内括约肌内表面最大位移为4.16 mm;收缩状态下肛管被挤压,肛门内括约肌内表面最大位移为1.89 mm;静息态及收缩状态下肛门内、外括约肌整体均向正前方移动。结论所获ASC有限元模型可在一定程度上模拟女性实际肌肉群生理活动及其应力分布。Objective To observe the simulation of a finite element model of healthy adult female anal sphincter complex(ASC)established based on MRI.Methods One healthy adult female was prospectively enrolled,and an ASC geometric model was constructed using Mimics 3D reconstruction software based on anal MRI.Then the model was meshed with finite elements,and the parameters of the anal sphincter experiment in vitro and normal human anorectal pressure data were referenced to establish a finite element model,and its physiological characteristics and stress distribution were analyzed.Results After applying boundary loads to the ASC finite element model,under resting-state,the contraction deformation occurred on external anal sphincter,with the maximum displacement of 0.02 mm for anal canal and the smaller maximum displacement for internal anal sphincter,and a significant low stress zone in front of the upper inner surface of anal canal was observed.Under forced state,significant dilation and deformation occurred on anal canal,with the maximum displacement of 4.16 mm for the inner surface of anal sphincter.Under contracted state,the anal canal was compressed,and the maximum displacement of 1.89 mm for the inner surface of anal sphincter.Under both resting-state and contracted state,internal and external anal sphincters wholly moved forward.Conclusion The established ASC finite element model based on MRI could simulate the physiological activities and stress distribution of actual female adult muscle to some extent.

关 键 词：肛管 磁共振成像 括约肌 耻骨直肠肌 三维有限元 

分 类 号：R657.1[医药卫生—外科学] R445.2[医药卫生—临床医学]