← WI | ● | TTP →
Wash-Out:
$WO = -min_t(\frac{df}{dt})$
The ratio of $\frac{WI}{WO}$ is also utilized often to mark tumor tissue, since tumors get saturated quickly but keep the contrast agent longer than normal tissue.
In particular representative for tumors: WI/WO
← WI | ● | TTP →