TABLE 1.

Contrast-free MRI acquisition protocol. Note: RARE = Rapid Acquisition with Relaxation Enhancement, TR = Repetition time, TE = Echo Time, TOF = Time of Flight.

Scan	Purpose	Imaging parameters
T2-weighted RARE	Scout images to verify correct coil placement and location and orientation of AVF	TR 2000 ms, TE 24 ms, RARE factor 4, 1 average, matrix 256 × 256, FOV 51.2 mm × 51.2 mm, in plane resolution 0.2 mm
TOF	Obtain detailed information on geometry	FLASH method, TR 18 ms, TE 4 ms, 8 averages, matrix 171 × 171, FOV 51.2 mm × 51.2 mm, resolution 0.3 mm, 50 overlapping axial slices at a thickness of 1 and 0.75 mm between slice spacing
T2-weighted fast spin echo with black-blood double inversion	Obtain black blood imaging used for AVF lumen reconstruction	TR 10000 ms, TE 33 ms, 4 averages, matrix 256 × 256, FOV 51.2 mm × 51.2 mm, in plane resolution 0.2 mm
Gradient echo velocity mapping	Obtain blood flow measures used for velocity extraction	TR 15 ms, TE 6 ms, 16 averages, matrix 150 × 256, FOV 30 mm × 51.2 mm, in plane resolution 0.2 mm with single 2 mm thick axial slices