Application of keyhole imaging to interventional MRI: A simulation study to predict sequence requirements

被引:45
作者
Duerk, JL
Lewin, JS
Wu, DH
机构
[1] Department of Radiology, University Hospitals of Cleveland, Case Western Reserve University, Cleveland
[2] Department of Biomedical Engineering, University Hospitals of Cleveland, Case Western Reserve University, Cleveland
关键词
rapid imaging; interventional MRI; K-space;
D O I
10.1002/jmri.1880060613
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
A wide variety of techniques have been proposed recently to improve the temporal resolution of MRI. These include echo-planar imaging methods, wavelet encoding, singular value decomposition encoding, and k-space sharing methods known as ''keyhole'' imaging, In this work, we use a simulation study to investigate the phase-encoding ordering and data-sharing methods required for the application of keyhole imaging to interventional MRI (I-MRI), The advantages of keyhole imaging over other methods are its simplicity and the use of conventional phase encoding and Fourier transform reconstruction found on virtually all modern MR imagers. Our analysis has predicted that conventional keyhole methods that repeatedly acquire only the center portion of k space, and those that sequentially progress from the center of k space outward, will not meet the combination of temporal and spatial resolution required for tip localization during I-MRI needle insertion, Instead, acquisitions that acquire both high and low k-space data, in ranked order, should provide acceptable tip position and needle width accuracy in both temporal and spatial domains for use in I-MRI.
引用
收藏
页码:918 / 924
页数:7
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