Local in vivo shimming using adaptive passive shim positioning

Sejung Yang, Hahnsung Kim, Min Oh Ghim, Byung Uk Lee, Dong Hyun Kim

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


A subject-specific local in vivo passive shimming method, focusing on the prefrontal and temporal regions, is proposed. The aim of the investigation is to show that subject variability exists in optimal passive shimming and that the proposed method can be effectively used to overcome these differences. A shimming structure capable of adjusting the position of the passive shims to within a millimeter resolution is built. The optimal shim positions for each individual subject are computed from obtained field map using a convex optimization algorithm. Passive shim experiments at predetermined fixed shim positions vs. individually adjusted shim positions were performed and compared. The results show that intersubject variability exists in the optimal shim positions and that the location-sensitive method proposed can be useful for improving main field homogeneity in vivo.

Original languageEnglish
Pages (from-to)401-407
Number of pages7
JournalMagnetic Resonance Imaging
Issue number3
StatePublished - Apr 2011


  • Magnetic field inhomogeneity correction
  • Passive shimming


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