Relaxivity data reported in Table 2 of the original manuscript were not derived correctly from the measured data. The reason was that slight nonlinearities of R₁ and R₂ versus concentration in Gd-DTPA and Gd-BT-DO3A were not considered. Furthermore, relaxation rates of pure plasma were not adequately accounted for. In the following Table 2, corrected relaxivity data r₁ and r₂ are given. Remaining differences of the corrected r₁ values to data published previously¹ can be most likely attributed to inaccuracies of concentration determination and/or species-dependent influences of the blood plasma samples.

TABLE 2 (corrected)
The r₁ and r₂ relaxivities in human blood plasma (37°C) for Gd-DTPA, Gd-BT-DO3A, and Gd-BOPTA at B₀ = 0.2 T, 1.5 T, and 3 T. The relaxivities were calculated for concentrations up to and including 1 mM.

	r1 (L×mmol-1×s-1)			r2 (L×mmol-1×s-1)
B0 (T)	Gd-DTPA	Gd-BT-DO3A	Gd-BOPTA	Gd-DTPA	Gd-BT-DO3A	Gd-BOPTA
0.2	5.7 ± 0.3	6.6 ± 0.3	10.9 ± 0.4	9.2 ± 0.3	10.7 ± 0.3	18.9 ± 0.6
1.5	3.9 ± 0.2	4.7 ± 0.2	7.9 ± 0.4	5.3 ± 0.2	7.5 ± 0.2	18.9 ± 0.5
3	3.9 ± 0.2	4.5 ± 0.2	5.9 ± 0.4	5.2 ± 0.3	6.3 ± 0.3	17.5 ± 0.5