Table 2:

MRV parameters used in our department.

	TOF-MRV	PC-MRV	CE-MRV
Acquisition type	2D (axial and coronal)	3D (sagittal left to right)	3D (sagittal left to right)
TR (ms)	23	15	3.4
TE (ms)	4.4	4	1.4
Slice thickness (mm)	2	1.4	2
Slice interval (mm)	2	0.7	1
Flip angle	50	15	25
Matrix	256×192	352×352	356×417
VENC	-	15 cm/s	-
Parallel imaging factor	-	2.5	3
Acquisition time	5 min 25 s	6 min 52 s	2 min 28 s

TOF-MRV: Time-of-flight magnetic resonance venography, PC-MRV: Phase-contrast magnetic resonance venography, CE-MRV: Contrast-enhanced magnetic resonance venography, 2D: Two-dimensional, 3D: Three-dimensional, ms: Millisecond, mm: Millimeter, VENC: Velocity encoding gradient, cm/s: Centimeter per second, min: Minute, s: Second