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Room temperature (RT) shims are used routinely in MRI to remove global and local B(0) field inhomogeneity introduced by the subject. Most clinical scanners use only second-order spherical harmonic terms, but with the increasing availability of very high field systems, third- and fourth-order terms are a serious consideration. However, choosing appropriate coil strengths is of critical importance in shim coil design since overspecification of the shim strengths can lead to a variety of problems, including shim coil self-resonance. In this study B(0) field map data collected over a period of 6 months (over 400 brain volumes) were analyzed to find the characteristic B-fields required to shim these brains. These data can be used to specify the coil requirements to effectively shim the human brain.

Original publication

DOI

10.1002/mrm.20735

Type

Journal article

Journal

Magn Reson Med

Publication Date

01/2006

Volume

55

Pages

210 - 214

Keywords

Brain Mapping, Humans, Magnetic Resonance Imaging, Temperature