An illustrated comparison of processing methods for phase MRI and QSM: removal of background field contributions from sources outside the region of interest

NMR Biomed. 2017 Apr;30(4):10.1002/nbm.3604. doi: 10.1002/nbm.3604. Epub 2016 Oct 7.

Abstract

The elimination of so-called background fields is an essential step in phase MRI and quantitative susceptibility mapping (QSM). Background fields, which are caused by sources outside the region of interest (ROI), are often one to two orders of magnitude stronger than tissue-related field variations from within the ROI, hampering quantitative interpretation of field maps. This paper reviews the current literature on background elimination algorithms for QSM and provides insights into similarities and differences between the many algorithms proposed. We discuss the basic theoretical foundations and derive fundamental limitations of background field elimination. Copyright © 2016 John Wiley & Sons, Ltd.

Keywords: QSM; background field removal; phase imaging; phase processing; review; susceptibility mapping.

Publication types

  • Comparative Study
  • Evaluation Study
  • Review

MeSH terms

  • Algorithms*
  • Artifacts*
  • Diffusion Magnetic Resonance Imaging / methods*
  • Image Enhancement / methods*
  • Image Interpretation, Computer-Assisted / methods*
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Signal Processing, Computer-Assisted
  • Signal-To-Noise Ratio
  • Subtraction Technique*