Predicting temperature increase through local SAR estimation by B1 mapping: a phantom validation at 7T

Annu Int Conf IEEE Eng Med Biol Soc. 2014:2014:1107-10. doi: 10.1109/EMBC.2014.6943788.

Abstract

It has been shown that Electrical Properties d(EPs) of biological tissues can be derived from MR-based B1 measurement. A strong appeal for these `Electrical Property Tomography' (EPT) methods is to estimate real-time and subject-specific local specific absorption rate (SAR) induced by RF transmission. In order to investigate the feasibility of EPT-based local SAR estimation, following previously proposed EPT protocols, induced local SAR has been firstly estimated under one B1 shim setting for a heating sequence at 7T; whereas with the same acquired B1 information, induced local SAR under a different B1 shim setting has been further predicted. Both of the SAR results have been compared to measured temperature changes using MRI Thermometry based on the proton chemical shift.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Absorption, Radiation
  • Magnetic Resonance Imaging / instrumentation*
  • Magnetic Resonance Imaging / methods*
  • Phantoms, Imaging*
  • Temperature*