To study temperature, heart rate, and blood pressure responses to high-field-strength magnetic resonance imaging (MRI) in patients who underwent procedures at exposures to radiofrequency irradiation above the whole-body specific absorption rate (SAR) of 0.4 W/kg.
|Exposure duration||15 min|
Body temperature significantly increased an average of 0.2°C and the highest body temperature recorded after MRI was 37.5°C. No significant correlation between the change in body temperature and whole-body average SARs was found. Changes in skin temperatures were variable, depending on anatomic site: The largest change was 3.5°C, and the highest skin temperature recorded after imaging was 35.1°C. A modest correlation between the change in skin temperatures and whole-body average SARs was found. Average heart rate and average mean blood pressure measured immediately before imaging were not significantly different afterward. High-field-strength MRI at the whole-body average SARs of 0.42-1.2 W/kg examined was not associated with any temperature- or hemodynamic-related deleterious effects.