基于单目视觉的头部磁共振运动伪影矫正系统研究  

Research on Head Magnetic Resonance Motion Artifacts Correction System Based on Monocular Vision

作　　者：蒋晗 陈慧军[1] 王春尧 窦佳琦 黎睿 徐子茗 JIANG Han;CHEN Huijun;WANG Chunyao;DOU Jiaqi;LI Rui;XU Ziming(School of Biomedical Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学生物医学工程学院,北京100084

出　　处：《中国医疗设备》2025年第2期1-5,23,共6页China Medical Devices

基　　金：国家自然科学基金委员会重点项目(81930119);“十三五”国家重点研发计划(2017YFC0108700);北京市自然科学基金重点研究专题(Z190024);北京市科委“揭榜挂帅”项目(Z231100004823012)。

摘　　要：目的设计一种基于单目视觉的头部磁共振成像运动矫正系统,以矫正头部磁共振运动伪影,提高成像质量,提供更加精准可靠的成像信息。方法该系统由磁兼容单目相机、光学定位支架、数据采集通信模块组成。通过光学定位支架将单目相机安装于核磁共振腔体内,实时记录人脸信息。基于人脸重建与运动检测算法,实现对人脸的重建与对头部的6自由度刚性运动检测。通过磁共振与相机间交叉标定,利用检测到的运动信息实现磁共振运动伪影的回顾式矫正。结果该系统人脸重建精度达0.57 mm,旋转、平移运动追踪精度分别为0.42°±0.06°和(0.64±0.12)mm,头部磁共振运动伪影显著减少。结论基于单目视觉可实现高精度的6自由度运动追踪与磁共振运动伪影矫正,提高磁共振成像质量,为医生提供更准确的影像信息。Objective To design a head magnetic resonance imaging motion correction system based on monocular vision to correct head magnetic resonance motion artifacts,so as to improve imaging quality and provide more accurate and reliable imaging information.Methods The system was composed of magnetic compatible monocular camera,optical positioning bracket and data acquisition communication module.The monocular camera was installed in the magnetic resonance imaging cavity by optical positioning bracket to record facial information in real-time.Based on facial reconstruction and motion detection algorithm,facial reconstruction and 6-degree-of-freedom rigid motion detection of the head were realized.Through the cross calibration between magnetic resonance and camera,the retrospective correction of magnetic resonance motion artifacts was realized by using the detected motion information.Results The face reconstruction accuracy of the system was 0.57 mm,the tracking accuracy of rotation and translation movements was 0.42°±0.06°and(0.64±0.12)mm,respectively,and the head magnetic resonance motion artifacts were significantly reduced.Conclusion Based on monocular vision,high precision 6-degree-of-freedom motion tracking and magnetic resonance motion artifact correction can be achieved to improve the quality of magnetic resonance imaging and provide more accurate image information for doctors.

关 键 词：单目视觉 核磁共振成像(MRI) 刚性运动追踪 运动伪影矫正 人脸重建 交叉标定 

分 类 号：R197.39[医药卫生—卫生事业管理]