Rapid measurement and correction of phase errors from B0 eddy currents: Impact on image quality for non-cartesian imaging

被引:38
作者
Brodsky, Ethan K. [1 ,2 ]
Klaers, Jessica L. [1 ]
Samsonov, Alexey A. [2 ]
Kijowski, Richard [2 ]
Block, Walter F. [1 ,2 ,3 ]
机构
[1] Univ Wisconsin, Dept Med Phys, Madison, WI 53706 USA
[2] Univ Wisconsin, Dept Radiol, Madison, WI 53706 USA
[3] Univ Wisconsin, Dept Biomed Engn, Madison, WI USA
关键词
B0 eddy currents; non-Cartesian imaging; 3DPR; radial imaging; COMPENSATION;
D O I
10.1002/mrm.24264
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
Non-Cartesian imaging sequences and navigational methods can be more sensitive to scanner imperfections that have little impact on conventional clinical sequences, an issue which has repeatedly complicated the commercialization of these techniques by frustrating transitions to multicenter evaluations. One such imperfection is phase errors caused by resonant frequency shifts from eddy currents induced in the cryostat by time-varying gradients, a phenomenon known as B0 eddy currents. These phase errors can have a substantial impact on sequences that use ramp sampling, bipolar gradients, and readouts at varying azimuthal angles. We present a method for measuring and correcting phase errors from B0 eddy currents and examine the results on two different scanner models. This technique yields significant improvements in image quality for high-resolution joint imaging on certain scanners. This result suggests that correcting short-time B0 eddy currents that do not affect conventional clinical sequences may simplify the adoption of non-Cartesian methods. Magn Reson Med, 2013. (C) 2012 Wiley Periodicals, Inc.
引用
收藏
页码:509 / 515
页数:7
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