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Single and double acquisition strategies for compensation of artifacts from eddy current and transient oscillation in balanced steady‐state free precession
Author(s) -
Lee HyunSoo,
Choi Seung Hong,
Park SungHong
Publication year - 2017
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.26338
Subject(s) - transient (computer programming) , eddy current , precession , oscillation (cell signaling) , imaging phantom , magnetization , steady state free precession imaging , signal (programming language) , artifact (error) , nuclear magnetic resonance , physics , magnetic resonance imaging , bloch equations , compensation (psychology) , steady state (chemistry) , computer science , magnetic field , optics , artificial intelligence , chemistry , medicine , psychology , biochemistry , quantum mechanics , psychoanalysis , radiology , programming language , operating system , astronomy
Purpose To develop single and double acquisition methods to compensate for artifacts from eddy currents and transient oscillations in balanced steady‐state free precession (bSSFP) with centric phase‐encoding (PE) order for magnetization‐prepared bSSFP imaging. Theory and Methods A single and four different double acquisition methods were developed and evaluated with Bloch equation simulations, phantom/in vivo experiments, and quantitative analyses. For the single acquisition method, multiple PE groups, each of which was composed of N linearly changing PE lines, were ordered in a pseudocentric manner for optimal contrast and minimal signal fluctuations. Double acquisition methods used complex averaging of two images that had opposite artifact patterns from different acquisition orders or from different numbers of dummy scans. Results Simulation results showed high sensitivity of eddy‐current and transient‐oscillation artifacts to off‐resonance frequency and PE schemes. The artifacts were reduced with the PE‐grouping with N values from 3 to 8, similar to or better than the conventional pairing scheme of N = 2. The proposed double acquisition methods removed the remaining artifacts significantly. The proposed methods conserved detailed structures in magnetization transfer imaging well, compared with the conventional methods. Conclusion The proposed single and double acquisition methods can be useful for artifact‐free magnetization‐prepared bSSFP imaging with desired contrast and minimized dummy scans. Magn Reson Med 78:254–263, 2017. © 2016 International Society for Magnetic Resonance in Medicine