Fig. 2From: A nitroxides-based macromolecular MRI contrast agent with an extraordinary longitudinal relaxivity for tumor imaging via clinical T1WI SE sequence a MRI signals of Linear pDHPMA-mPEG-Ppa-PROXYL (Group 1) and 3-CP (Group 2) and b their derived longitudinal relaxivities (r1) in vitroBack to article page