Understanding SAR, dB/dT, and other Safety Metrics

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Guest Dr. Karl Vigen discusses managing patient warming and heating in implants and devices as it relates to the radio frequency field.  Specific topics include Specific Absorption Rate (SAR), Specific Energy Dose (SED) and B1+rms.

  • Discuss SAR as it relates to tissue heating
  • Explain the different SAR modes
  • Explore the reasons for ‘hot spots’ in respect to the RF coil being used
  • Describe SED and how it differs from SAR
  • Verbalize the limits in which the MR scanner will not allow you to image the patient for 24 hours
  • Define B1+rms
  • Assess how B1+rms is helpful in regards to implants and Devices

The content of this Contrast Enhanced MRI Program is intended for healthcare professionals who work in the MRI environment. These individuals include MRI Technologists, Imaging Nurses, MRI Researchers, and Others.

This program has been submitted for 1.00 hours of Category A CE credit as designated by the Society for MR Radiographers & Technologists (SMRT) RCEEM.

Greenberg_ISMRM-ACR MR Safety_jmri 2020

ACR Guidance Document on MR Safe Practices: Updates and Critical Information 2019

Direct link:  https://onlinelibrary.wiley.com/doi/epdf/10.1002/jmri.26880


Invisible metallic microfiber in clothing presents unrecognized MRI risk for cutaneous burn

Pietryga JA, Fonder MA, Rogg JM, North DL, Bercovitch LG

AJNR Am J Neuroradiol. 2013 May;34(5):E47-50. doi: 10.3174/ajnr.A2827. Epub 2011 Dec 15

Direct link: http://www.ajnr.org/content/ajnr/34/5/E47.full.pdf


Thermal tissue damage model analyzed for different whole-body SAR and scan durations for standard MR body coils

Murbach M, Neufeld E, Capstick M, Kainz W, Brunner D, Samaras T, Pruessmann KP, Kuster N

Magn Reson Med. 2014 Jan;71(1):421-31. doi: 10.1002/mrm.24671. Epub 2013 Feb 14

Direct link: https://onlinelibrary.wiley.com/doi/full/10.1002/mrm.24671


Unexpected magnetic resonance imaging burn injuries from jogging pants

Tokue H, Tokue A, Tsushima Y.

Radiol Case Rep. 2019 Sep 5;14(11):1348-1351. doi: 10.1016/j.radcr.2019.08.015. eCollection 2019 Nov

Direct link:  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6734033/