Journal of Medical Physics
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Year : 2001  |  Volume : 26  |  Issue : 1  |  Page : 14-16

Effect Of Endorsed Body Weight On Specific Absorption Rate During Magnetic Resonance Imaging


Correspondence Address:
Harish K Sigh

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Source of Support: None, Conflict of Interest: None

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As a routine safety of the patients undergoing magnetic resonance imaging (MRI), the limits of radio frequency (RF) specific absorption rate (SAR) are set by the manufacturers of all MRI systems because RF causes thermogenesis of the RF exposed tissue. It has been mandatory practice to endorse body weight and age of the patients required by the MRI systems for the SAR check. The problems arise on those patients who are critically ill, and consequently body weight could not be measured. In such cases, approximate body weight has to be endorsed. In case of underweight and overweight patients, sometimes SAR check does not permit to run the MRI pulse sequences. Also, in such cases, body weight remains the parameter which is being changed to get the MRI done. The purpose of this study is to assess the change of SAR with endorsed body weight. The change of SAR was recorded with the endorsed weight using phantoms and most commonly used T1 and T2 weighted pulse sequence on clinical MRI system. At true endorsed weight, using respective coils and the head and spine coil phantoms, the body averaged and localised SAR were found to be within limits while this was not the case with body coil phantom. Unrealistic endorsed weights are permissible for the adult age cases in all coils while using the routine T1 and T2 weighted pulse sequences. This finding is absolutely new in the field and certainly, will be of great applicability to develop a uniform and standard system of SAR checks in the patient interest.

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