Fig. 10.

Registered average of phase contrast vascular images of N2 at $7^{\circ }$ T ${0.5}^{\circ }$ SR using (a) vertical line illumination and (b) horizontal line illumination. (c)-(d) show the velocity measurement over 2 seconds showing average velocity of 4 mm/s. (e)-(f) Corresponding normalized cross-correlation values, showing inverse relationship with the flow velocities. (g)-(h) show similar images of N3 at ${6.3}^{\circ }$ T ${2.75}^{\circ }$ IR. (i)-(j) Blood flow velocity measurement from (g)-(h) showing average velocity of 2 mm/s. (k)-(l) Corresponding normalized cross-correlation values, showing lower normalized cross-correlation values with illumination lines perpendicular to the vessel than those parallel to the vessel. The orange lines indicate the orientation of the line illumination. The scale bar is 20 $\mu$ m.