In-room imaging and MR planning

What is Diffusion: Summary

• The motion of water molecules in vivo

• In biological tissues the observed or “apparent” diffusion of water with tissues typically <<< pure water

• Interactions with intracellular elements, membranes, and macromolecules restrict water diffusion

• The DWI signal is derived from the motion of water molecules in the extracellular space, the intracellular space and the intravascular space

Le Bihan et al., Radiology, 1988 Koh et al., AJR, 2007