Real-Time Motion Correction for High-Resolution Larynx Imaging

被引:6
作者
Barral, Joelle K. [1 ]
Santos, Juan M. [1 ,2 ]
Damrose, Edward J. [3 ]
Fischbein, Nancy J. [3 ,4 ]
Nishimura, Dwight G. [1 ]
机构
[1] Stanford Univ, Dept Elect Engn, Magnet Resonance Syst Res Lab, Stanford, CA 94305 USA
[2] HeartVista Inc, Los Altos, CA USA
[3] Stanford Univ, Dept Otolaryngol, Stanford, CA 94305 USA
[4] Stanford Univ, Dept Radiol, Stanford, CA 94305 USA
关键词
larynx imaging; motion correction; real-time imaging; navigators; DVA; CENTRIC VIEW ORDER; MRI; FLASE;
D O I
10.1002/mrm.22773
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
100231 [临床病理学]; 100902 [航空航天医学];
摘要
Motion-both rigid-body and nonrigid-is the main limitation to in vivo, high-resolution larynx imaging. In this work, a new real-time motion compensation algorithm is introduced. Navigator data are processed in real time to compute the displacement information, and projections are corrected using phase modulation in k-space. Upon automatic feedback, the system immediately reacquires the data most heavily corrupted by non-rigid motion, i.e., the data whose corresponding projections could not be properly corrected. This algorithm overcomes the shortcomings of the so-called diminishing variance algorithm by combining it with navigator-based rigid-body motion correction. Because rigid-body motion correction is performed first, continual bulk motion no longer impedes nor prevents the convergence of the algorithm. Phantom experiments show that the algorithm properly corrects for translations and reacquires data corrupted by nonrigid motion. Larynx imaging was performed on healthy volunteers, and substantial reduction of motion artifacts caused by bulk shift, swallowing, and coughing was achieved. Magn Reson Med 66:174-179,2011. (C) 2011 Wiley-Liss, Inc.
引用
收藏
页码:174 / 179
页数:6
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