Measurement of temperature at the body surface during FSE MR imaging using digital thermometers

The recent increase in the incidence of SAR and fever contracted during medical examinations has raised concerns about transmission from the WB coil used during magnetic resonance imaging(MRI)using SENSE. We measured changes in temperature at the body surface during MRI medical examinations using T2 Fast Spin Echo(T2FSE)and Hahn T2 Fast Spin Echo(Hahn-T2FSE). We initially calibrated the thermometer in an incubator and confirmed that it operated normally in a high magnetic field and that it was not damaged or influenced by heat generated by RF pulses. All experiments were performed using an Excel ART Pianissimo 1.0T(Toshiba Medical Systems)and Thermo clone SL type(KN Laboratories). The temperature at the body surface changed according to the measurement point. The temperature increase was lower when measured with Hahn-T2FSE than with T2FSE. One limitation of this study was that temperature was measured only during 1.0 T MRI.