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Figure 3. Calculated parametric images of cerebral blood volume (CBV), cerebral blood flow and mean transit time (MTT) from a normal healthy volunteer. The images were acquired using T2* weighted dynamic imaging techniques. Data were analysed using a gamma variate curve fit analysis to allow calculation of each parameter. Note the clear distinction between grey matter, white matter and blood vessels in both the CBV and flow maps. In the MTT map slight prolongation of the MTT can be seen in the watershed areas.