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Abstract #1113

Self-Correction of B0 Field Drift and k-space Trajectory Errors in Alternating Unbalanced SSFP for Robust R2 and R2’ Mapping

Eunseo Bae1, Sungsuk Oh2, Felix Werner Wehrli3, and Hyunyeol Lee1,3
1School of Electronic and Electrical Engineering, Kyungpook National University, Daegu, Korea, Republic of, 2Medical Device Development Center, Daegu-Gyeongbuk Medical innovation Foundation (K-MEDI Hub), Daegu, Korea, Republic of, 3Department of Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States

Synopsis

Keywords: Artifacts, Artifacts, Quantitative Imaging, Relaxometry

Motivation: Accurate estimation of R2 and R2' provides insights into physiologic and functional states of tissues.

Goal(s): To investigate the feasibility of self-correction of B0 field drift and radial trajectory errors in the nonbalanced SSFP-based R2 and R2’ mapping technique.

Approach: The inherent phase characteristics of the alternating nonbalanced SSFP are utilized, enabling self-correction of B0 field drift and k-space trajectory errors.

Results: In both phantom and brain scans, accuracy of parametric maps were enhanced with the self-correction of the two types of image artifacts.

Impact: The proposed method, which mitigates artifacts from B0 drift and trajectory mismatch in a self-correction manner, may prove to be a useful means in a wide range of neuroimaging studies seeking rapid and accurate quantifications of R2 and R2’.

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Keywords