| MS (n = 59) Pre-contrast Mean (SD) | MS (n = 48) Post-contrast Mean (SD) | HC (n = 33) Pre-contrast Mean (SD) | HC (n = 7) Post-contrast Mean (SD) | p-valuea | p-valueb | p-valuec | p-valued |
---|---|---|---|---|---|---|---|---|
ATVV for all vein diameters | 66.9 (16.6) | 68.9 (15.1) | 82.9 (17.4) | 91.6 (18.1) | < .0001 | < .0001 | NS | .01 |
   ATVV with diameter < .3 mm | 45 (10) | 48.9 (7.9) | 53.8 (10.2) | 61.3(7.7) | < .0001 | < .0001 | NS | .01 |
   ATVV with diameter .3-.6 mm | 15.5 (4.4) | 16.3 (4.6) | 17.4 (4.7) | 21.2 (5.2) | .068 | .046 | NS | .018 |
   ATVV with diameter .6-.9 mm | 4.5 (1.8) | 4.5 (2) | 4.9 (2) | 5.3 (2) | NS | NS | NS | .044 |
   ATVV with diamater > .9 mm | 1.9 (0.9) | 1.9 (1.2) | 2.1 (0.9) | 2.3 (0.9) | NS | NS | NS | NS |
Venous intracranial fraction | 0.061 (0.02) | 0.062 (0.01) | 0.067 (0.01) | 0.069 (0.01) | .049 | .05 | NS | NS |
Average distance from vein | 1.24 (0.2) | 1.23 (0.4) | 1 (0.1) | 0.94 (0.1) | < .0001 | < .0001 | NS | .018 |
 | RR (n = 41) Pre-contrast Mean (SD) | RR (n = 32) Post-contrast Mean (SD) | SP (n = 18) Pre-contrast Mean (SD) | SP (n = 9) Post-contrast Mean (SD) | p-value e | p-value f |  |  |
ATVV for all vein diameters | 64.5 (18.7) | 66.5 (17.2) | 72.4 (8.3) | 74.2 (6.2) | .06 | NS | Â | Â |
   ATVV with diameter < .3 mm | 43.4 (11.1) | 47.7 (8.5) | 48.6 (7.1) | 51.5 (5.9) | .046 | NS |  |  |
   ATVV with diameter .3-.6 mm | 14.9 (5) | 15.4 (5.2) | 16.9 (2.1) | 18.3 (2) | NS | .048 |  |  |
   ATVV with diameter .6-.9 mm | 4.2 (2.1) | 4.2 (2.2) | 5.2 (0.6) | 5.2 (0.4) | NS | NS |  |  |
   ATVV with diamater > .9 mm | 1.8 (1.1) | 1.7 (1.4) | 2.3 (0.5) | 2.1 (0.4) | NS | NS |  |  |
Venous intracranial fraction | 0.058 (0.02) | 0.059 (0.01) | 0.068 (0.008) | 0.068 (0.008) | .025 | .052 | Â | Â |
Average distance from vein | 1.26 (0.2) | 1.29 (0.4) | 1.22 (0.2) | 1.23 (0.2) | NS | NS | Â | Â |