MR imaging perfusion measurements in four DVAs
| Case 1 | Case 2 | Case 3 | Case 4 | Mean | |
|---|---|---|---|---|---|
| Age/Sex | 44/F | 31/F | 35/M | 60/M | |
| draining vein diameter (mm) | 3.80 | 1.00 | 5.50 | 2.60 | |
| CBF ratio* | 3.51 | 4.89 | 15.80 | 1.31 | 6.38 |
| CBV ratio | 4.27 | 4.22 | 8.47 | 3.39 | 5.09 |
| MTT ratio | 1.84 | 1.37 | 1.22 | 1.64 | 1.52 |
| TTP ratio | 1.11 | 1.05 | 1.07 | 1.08 | 1.08 |
*
A ratio was computed for each parameter by drawing a region of interest around the area of signal abnormality associated with the DVA (ROIDVA) and a region of interest around a similar area of uninvolved contralateral brain (ROIcontra). The ratio was computed by dividing the mean signal intensity of ROIDVA by the mean signal intensity of ROIcontra.