Brownian motion, behavior of fat and water in mri

body of water between green leaf trees

Brownian motion

  • Each substance contains molecules that are constantly in motion
  • This motion has rotational and transitional components
  • The faster the motion within, the harder it is to release energy to its surroundings

Behavior of fat and water in MRI

Fat
  • Molecules closely packed together
  • Slow rate of molecular motion
  • Low inherent energy, hence can absorb energy efficiently
Water
  • Molecules spaced far apart
  • High rate of molecular motion
  • High inherent energy, hence does not absorb energy efficiently