Single and double acquisition strategies for compensation of artifacts from eddy current and transient oscillation in balanced steady-state free precession

Authors

  • Hyun-Soo Lee,

    1. MRI Laboratory, Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Korea
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  • Seung Hong Choi,

    1. Department of Radiology, Seoul National University College of Medicine, Seoul, Korea
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  • Sung-Hong Park

    Corresponding author
    1. MRI Laboratory, Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Korea
    • Correspondence to: Sung-Hong Park, Ph.D., Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Rm 1002, CMS (E16) Building, 291 Daehak-ro, Yuseong-gu, Daejeon, South Korea 34141. E-mail: sunghongpark@kaist.ac.kr

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Abstract

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, 2016. © 2016 Wiley Periodicals, Inc.

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