Measurement of SAR-induced temperature increase in a phantom and in vivo with comparison to numerical simulation

Sukhoon Oh, Yeun Chul Ryu, Giuseppe Carluccio, Christopher T. Sica, Christopher M. Collins

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

Purpose To compare numerically simulated and experimentally measured temperature increase due to specific energy absorption rate from radiofrequency fields. Methods Temperature increase induced in both a phantom and in the human forearm when driving an adjacent circular surface coil was mapped using the proton resonance frequency shift technique of magnetic resonance thermography. The phantom and forearm were also modeled from magnetic resonance image data, and both specific energy absorption rate and temperature change as induced by the same coil were simulated numerically. Results The simulated and measured temperature increase distributions were generally in good agreement for the phantom. The relative distributions for the human forearm were very similar, with the simulations giving maximum temperature increase about 25% higher than measured. Conclusion Although a number of parameters and uncertainties are involved, it should be possible to use numerical simulations to produce reasonably accurate and conservative estimates of temperature distribution to ensure safety in magnetic resonance imaging.

Original languageEnglish (US)
Pages (from-to)1923-1931
Number of pages9
JournalMagnetic Resonance in Medicine
Volume71
Issue number5
DOIs
StatePublished - May 2014

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging

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