Fig 1. Longitudinal relaxivity profile of Gd(ABE-DTTA) and Gd-DTPA.

A: The field dependency of the longitudinal relaxivity of 4 mM Gd-DTPA (circles) and 0.5 mM and 1 mM Gd(ABE-DTTA) (diamonds and squares, respectively) acquired with NMRD is shown. B: The relaxivity of Gd(ABE-DTTA) and GD-DTPA obtained on a series of static field MRI and NMR instruments listed in Table 1, as a function of magnetic field strength is shown. All measurements were carried out at 37°C and pH 7.4.