Does mri scan results in body heating?, does it raises core body temperature, isn't that harmful??

Good question. Theoretically, yes, MRI can raise body temperature slightly. The information I've found says that in some have experienced slight increase in body temp., just under 1 degree celsius in 1.5 Tesla magnets and up to 1 degree celsius in 3 Tesla magnets. One study in children under anesthesia showed slight decrease due to anesthesia. The small temperature fluxes do not appear harmful