Internal biological clocks, controlled by the provide an
approximate schedule for various processes, including sleep and waking, body
temperature and hunger.
Ocingulate cortex
hypothalamus
Ohippocampus
Oamygdala

Unlike  ct scans, which use x-rays,  mri scans  use powerful magnetic fields and radio frequency pulses to produce detailed pictures of organs, soft tissues, bone and other internal body structures.  differences between  normal and abnormal tissue is often clearer on an  mri  image than a  ct.you can see more with a mri scan. for example on an mri you can see internal bleeding.

What are the choices