FIG 3. Parametric images of a normal participant. Color charts explain color coding for each image type.

A, Distribution of rCBV and TTP. Colors attempt to identify the distribution of large blood vessels (red indicates rCBV >50% and TTP <10 s), areas of increased vascular attenuation and delayed flow (new vessel formation) (white indicates rCBV >50% and TTP >10 s), areas of normal capillary flow (orchid indicates rCBV <50% and TTP <6 s), and areas of delayed flow in capillary beds (blue indicates rCBV <50% and TTP from 6 to 10 s, green indicates rCBV <50% and TTP from 10 to 14 s, and yellow indicates rCBV <50% and TTP >14 s).

3B and C, Distribution of abnormal TTP. Colors identify the distribution as follows: red, areas of normal TTP and elevated rR (TTP <6 s and rR >0.35); blue, areas of elevated TTP but normal rR (TTP >6 s and rR <0.35); yellow, areas of delayed flow and elevated rR (TTP >6 s and rR >0.35)