Figure 3. Bar graphs of mean body temperature increase (°C) and heart rate (HR) as a function of MRI magnetic field strength. Error bars indicate standard deviations. A relationship between body temperature increase and change in HR over the course of MRI scan is apparent. For example, body temperature increase was higher if the initial HR (before MRI scan) was faster than that at the end of the MRI procedure. Vertical lines represent standard deviation. Star symbols *, indicate statistically significant differences. *; P < 0.05.