Table 1.

Comparison of T₁ Measurement Techniques in Phantoms

Gd (mM)	T1ref (seconds)	IR‐ss 4pt (seconds)		IR 2pt (seconds)
	Meana	Meana	%diff	Meana	%diff
0	2.82	2.78	−1.2	1.63	−42.1
0.05	1.86	1.84	−1.2	1.39	−25.6
0.10	1.33	1.35	1.8	1.16	−12.5
0.15	1.06	1.07	0.9	0.90	−15.2
0.20	0.83	0.82	−0.9	0.77	−7.2
0.30	0.62	0.62	0.8	0.59	−3.7
0.40	0.50	0.52	2.8	0.49	−1.8
0.50	0.42	0.44	5.2	0.41	−1.9
0.60	0.36	0.37	3.5	0.36	0.1
0.70	0.31	0.32	5.5	0.31	1.2
0.80	0.28	0.30	5.8	0.28	0.9
0.90	0.25	0.26	3.3	0.25	−0.5
2.00	0.12	0.15	20.7	0.13	1.4

^aSD < 0.01.

IR‐SS 4pt = single‐shot IR b‐SSFP 4‐point (pre‐contrast), IR 2pt = segmented IR b‐SSFP 2‐point ratio method (post‐contrast).