Dynamic Susceptibility Contrast (DSC) MRI relies upon imaging the passage of a Gadolinium based contrast agent to measure perfusion in the brain. Since the contrast agent cannot cross the blood brain barrier (excepting in some diseases) the dynamic signal elates to the transit of the agent through the vasculature. It is thus possible to arrive at a measure of blood supply to the tissue. This is often performed in a qualitative or semi-quantitaive manner, for example by measuring timing information about the contrast passage