Experimental evaluation of nonlinearities of small-sized insertable gradient coils

Magn Reson Imaging. 1998 Dec;16(10):1257-63. doi: 10.1016/s0730-725x(98)00124-6.

Abstract

A phase imaging technique is proposed to map out and quantify gradient nonlinearities of small-sized insertable gradient coils, assuming the whole-body system gradients are highly linear in the domain of interest. The theory is developed and simple equations are derived to allow quantification. It is applied to a 4-loop 18-cm diameter cylindrical gradient coil of optimal design. Experimental gradient nonlinearity maps are obtained for different fields of view. Gradient non-linearities are quantified locally and in regions of interest, showing close agreement with model data.

Publication types

  • Comparative Study

MeSH terms

  • Algorithms
  • Humans
  • Image Processing, Computer-Assisted / methods
  • Image Processing, Computer-Assisted / statistics & numerical data
  • Magnetic Resonance Imaging / instrumentation*
  • Magnetic Resonance Imaging / methods
  • Magnetic Resonance Imaging / statistics & numerical data
  • Nonlinear Dynamics*
  • Phantoms, Imaging / statistics & numerical data