Eddy current effects on a clinical 7T-68 cm bore scanner

MAGMA. 2010 Feb;23(1):39-43. doi: 10.1007/s10334-009-0192-0. Epub 2009 Dec 9.


Introduction: Eddy currents induced by switching of magnetic field gradients can lead to distortions in short echo-time spectroscopy or diffusion weighted imaging. In small bore magnets, such as human head-only systems, minimization of eddy current effects is more demanding because of the proximity of the gradient coil to conducting structures.

Methods: In the present study, the eddy current behavior achievable on a recently installed 7 tesla-68 cm bore head-only magnet was characterized.

Results: Residual effects after compensation were shown to be on the same order of magnitude as those measured on two whole body systems (3 and 4.7 T), while using two to three fold increased gradient slewrates.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Electric Impedance*
  • Electromagnetic Fields*
  • Head / pathology
  • Head / physiology
  • Humans
  • Image Interpretation, Computer-Assisted*
  • Magnetic Resonance Imaging / instrumentation*
  • Magnetics*
  • Phantoms, Imaging
  • Whole Body Imaging*