Fig. 5From: A nitroxides-based macromolecular MRI contrast agent with an extraordinary longitudinal relaxivity for tumor imaging via clinical T1WI SE sequenceRepresentative MR T1-weighted images of tumors of one mouse after injection of Linear pDHPMA-mPEG-Ppa-PROXYL (a) or DTPA-Gd (b). c Quantitative analysis of the relative enhanced signal ratio at the tumor site after injection of Linear pDHPMA-mPEG-Ppa-PROXYL or DTPA-GdBack to article page