Table 2.

Bland Altman limits of agreement (LA) for comparison of spiral 4D flow, Cartesian 4D flow (both assessed in upper abdominal vessels) and cine 2D phase contrast (assessed in the portal vein). Limits of agreement for inter-observer reproducibility are also given.

				Flow	Area	Vavg	Vpeak
ALL VESSELS	Inter-technique	Spiral 4D vs. Cartesian 4D	Mean	−2.6	−0.10	−0.4	−1.5
			LA	−11.8/6.6	−0.66/0.45	−7.7/6.9	−27.2/24.3
	Inter-observer	Cartesian 4D	Mean	−0.7	−0.02	−0.4	−1.4
			LA	−8.7/7.3	−0.44/0.40	−6.2/5.4	−36.1/33.2
		Spiral 4D	Mean	−0.9	−0.02	−0.8	−1.2
			LA	−7.2/5.4	−0.60/0.57	−5.7/4.1	−23.8/21.3
PORTAL VEIN	Inter-technique	Spiral 4D vs. Cartesian 4D	Mean	−1.8	−0.15	−0.3	−0.1
			LA	−11.8/8.2	−0.94/0.65	−6.1/5.5	−8.9/8.8
		Cartesian 4D vs. cine 2D	Mean	2.1	−0.59	3.4	8.2
			LA	−10.6/14.6	−1.55/0.38	−3.3/10.0	−0.4/16.8
		Spiral 4D vs. cine 2D	Mean	0.2	−0.73	3.1	8.1
			LA	−8.8/9.3	−1.51/0.04	−0.6/6.8	2.3/14.0
	Inter-observer	Cartesian 4D	Mean	0.2	−0.03	0.2	−0.1
			LA	−3.5/3.9	−0.34/0.29	−3.3/3.6	−4.7/4.6
		Spiral 4D	Mean	−1.1	−0.12	−0.2	0.2
			LA	−5.1/2.8	−0.79/0.56	−1.8/1.3	−1.6/2.1
		Cine 2D	Mean	−0.6	0.11	−0.6	−0.3
			LA	−5.2/4.1	−0.26/0.49	−3.4/2.2	−2.1/1.4

Area: time-averaged vessel area in cm²; Flow: time-averaged total flow in mL/s; HV: hepatic vein; IVC: inferior vena cava; LA: limits of agreement; SMA: superior mesenteric artery; SMV: superior mesenteric vein; V_avg: time-averaged through-plane velocity in cm/s; V_peak: peak through-plane velocity in cm/s