Rapid measurement and correction of phase errors from B0 eddy currents: impact on image quality for non-Cartesian imaging.
Rapid measurement and correction of phase errors from B0 eddy currents: impact on image quality for non-Cartesian imaging.
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DOI：
10.1002/mrm.24264
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发表时间：
2013-02
影响因子：
3.3
通讯作者：
Block, Walter F.
中科院分区：
文献类型：
--
作者：
Brodsky, Ethan K.;Klaers, Jessica L.;Samsonov, Alexey A.;Kijowski, Richard;Block, Walter F.
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 multi-center evaluations. One such imperfection is phase errors caused by resonant frequency shifts from eddy currents induced in the cryostat by time-varying gradients, a phenomemon 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. The results suggest that correction of short time B0 eddy currents in manufacturer provided service routines would simplify adoption of non-Cartesian sampling methods.
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