Fig 4. Multiple postlabeling delay times (200–1500 ms): effect on ASL signal intensity in the AVM (patient 1). M (T1-corrected) measured in regions of interest for the AVM (diamond), sagittal sinus (triangle), right MCA territory (box), and entire brain (circle) at each delay is plotted (above), with M maps from 1 imaging location at multiple delays for comparison (below). ASL signal intensity is relatively stable in global measures over the entire brain and in the MCA at longer delays as expected. Signal intensity decreases in AVM and increases in sagittal sinus as delay increases.