Table 1.

Background velocity, flow, mean flow velocity, RI and PI for the renal arteries analysed with different methods of background phase correction

Background correction method	Background velocity (mm/s)	RABF per kidney (ml/min)	Mean velocity (mm/s)	Resistive index	Pulsatility index
None	0 +/− 0	413 +/− 122	253.5 +/− 65.2	0.71 +/− 0.06	1.47 +/− 0.29
Stationary phantom	−2.9 +/− 3.3**	417 +/− 119**	256.5 +/− 64.5**	0.71 +/− 0.06*	1.45 /- 0.29*
Background fit	−4.6 +/− 7.4*	420 +/− 124*	258.1 +/− 68.3*	0.70 +/− 0.06*	1.44 +/− 0.28*

Data are from the initial scanning session (10 subjects × 2 acquisitions (left and right arteries) = 20 acquisitions in total) and are presented as mean +/− SD. (*p < .01, **p < .001 (compared to no background correction)).