Fig. (5).

Quantitative baseline hemodynamic maps and responses to somatosensory stimulation [37]. Images are shown from two out of seven animals. CBV_a maps (grayscale images in top row) were acquired with MT-varied ASL, while CBV_t maps (grayscale images in bottom row) were obtained with 15 mg Fe/kg contrast agent, where quantitative baseline values are shown in units of ml/100g. Functional activation maps for ΔCBV_a (color overlays in top row) and ΔCBV_t (color overlays in bottom row) are shown as cross-correlation values. Activation foci are all located in the forelimb somatosensory cortex. Quantitative comparisons of ΔCBV_a vs. ΔCBV_t (right plot) were made by taking the differences between baseline and stimulation conditions within a 9-pixel region (i.e., 1.4×1.4×2.0 mm³) centered over the anatomically-defined somatosensory cortex. The similarity of ΔCBV_t and ΔCBV_a (within measurement error), indicates that arterial CBV changes are dominant. The line of identity is shown.