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. Author manuscript; available in PMC: 2014 Apr 22.
Published in final edited form as: Contrast Media Mol Imaging. 2009 Mar-Apr;4(2):89–100. doi: 10.1002/cmmi.267

Figure 1.

Figure 1

Factors influencing solvent water relaxation. The metal complex has an inner-sphere (IS) of nitrogen and oxygen atoms from the DOTA ligand and a coordinated water molecule. There is a distinct 2nd hydration sphere (SS) with Gd-H distance r’, and water molecules from both spheres undergo exchange with bulk water at rates 1/τm and 1/τm’ for 1st and 2nd sphere exchange