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NEMA MS 8

2016 Edition, January 1, 2016

Complete Document

Characterization of the Specific Absorption Rate (SAR) for Magnetic Resonance Imaging Systems



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Referenced Items:

21 CFR 800-1299

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Description / Abstract:

This NEMA Standards Publication describes two measurement procedures for whole-body SAR measurements, the calorimetric method and the pulse-energy method. Extrapolation of these data to patient temperature rise is beyond the scope of this document. This document does not apply to gradient (low-frequency time-varying magnetic fields) safety where nerve and cardiac excitation are the primary safety issues. Neither is it intended to apply to spatial peak or local average SAR nor does it address other factors involved with patient heating. The tests specified are only for volume RF transmit coils that produce relatively homogeneous RF fields.

ANSI/NEMA MW 1000, 2014