Fast 2D Imaging for Distortion Correction Near Metal Implants
Brian A Hargreaves 1 , Valentina Taviani 1 , and Daehyun Yoon 2
Radiology, Stanford University, Stanford,
CA, United States,
Stanford University, Stanford, California, United States
Multi-spectral imaging (MSI) methods such as SEMAC,
MAVRIC, and MAVRIC-SL, offer excellent metal artifact
reduction. Variants of these methods all use 3D imaging,
limiting both minimum scan time and flexibility. Here we
present an approach using 2D imaging of limited volumes,
produced by flipping the selection gradient sign between
excitation and refocusing pulses. The volumes are
combined directly, avoiding the need for z phase
encoding and view-angle tilting. Artifact correction is
comparable to MSI methods, though at an SNR penalty.
Advantages include fast imaging of a small number of
slices, and easy localization of off-resonance signal to
improve scan efficiency.
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