Experimental assessment of MRI-induced temperature change and SAR distributions in phantoms
Date
2017-11-14Author
Blackwell, J.
Van der Putten, Wil
Tuohy, Brendan
Colgan, Niall
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Blackwell, J. , Van der Putten, Wil , Tuohy, Brendan , & Colgan, Niall (2017). Experimental assessment of MRI-induced temperature change and SAR distributions in phantoms Paper presented at the Institute of Physics and Engineering in Medicine (IPEM) Conference in MR Safety Update, York, England, 14 November.
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Abstract
During an MR procedure, most of the transmitted RF power is transformed into
heat within the patients’ tissue resulting from resistive losses, referred to as the specific energy
absorption rate(SAR) (2). The EU standardisation has mandated that all scanners must measure
SAR in patients and develop system safeguards to ensure that the limits(IEC60602-3-33) are not
exceeded. Accurate estimation of SAR is critical in safeguarding patients who may be
unconscious/sedated, have implants or are pregnant. Modern MRI systems can easily exceed
safe SAR levels (1) requiring the independent verification of manufacturers SAR estimations.