![]() Of note is that there is no direct way to measure SAR prior to or during an MRI procedure. SAR is patient dependent and varies depending on the patient’s size and mass (weight). SAR is the rate at which energy is absorbed by the body when exposed to the RF electromagnetic field (B1) and is measured in units of Watts per kilogram (W/kg) of body weight. ![]() The metric typically presented in MR Conditional labeling that addresses this matter is the whole body averaged specific absorption rate (SAR). When performing magnetic resonance imaging (MRI) examinations on patients with implants and devices, it is important to be aware of, and to control, the amount of radiofrequency (RF) power that is utilized in order to ensure patient safety. B1+RMS, The root-mean-square value of the MRI Effective Component of the RF Magnetic (B1) Field
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