Changes in body temperature measured rectally during a magnetic resonance imaging (MRI) examination for the control group and the heat insulating group (filled circle, control; filled square, heat insulating; central large bar, median; upper and lower bars, maximum and minimum, respectively). The change in body temperature was recorded from the time of anesthesia induction to the end of the MRI examination. A decrease in body temperature was significantly prevented in the heat insulating group compared to the control group (p < 0.05, Mann–Whitney U test). (a) indicates dogs; (b) indicates cats.