A fast, reliable, automatic shimming procedure using 1H chemical-shift-imaging spectroscopy

J Magn Reson B. 1995 Sep;108(3):213-9. doi: 10.1006/jmrb.1995.1126.


The importance and the difficulty of achieving good B0 homogeneity over the volume of interest in in vivo NMR spectroscopy are well known. A fast, reliable, versatile, and fully automatic shimming procedure has been developed, using 3D chemical-shift imaging to measure the field distribution using only the water peak in the sample of interest. The procedure minimizes the mean-square error in the field distribution with respect to a constant field where the signal exists (e.g., the head). This produces a set of linear equations that can be solved by standard matrix methods. The procedure has been applied on a commercial imager producing water linewidths from the entire head as low as 8 Hz at 1.5 T. The mean linewidth and standard deviation from 94 head studies were 11.7 +/- 1.9 Hz.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Algorithms
  • Automation
  • Body Water / metabolism
  • Brain / metabolism
  • Humans
  • Hydrogen
  • Image Enhancement / methods*
  • Linear Models
  • Magnetic Resonance Spectroscopy / methods*
  • Muscle, Skeletal / metabolism
  • Reproducibility of Results
  • Water / chemistry


  • Water
  • Hydrogen