Fig. 3From: Theranostics and contrast agents for magnetic resonance imaginga Preparation of the cancer-recognizable MRI contrast agents (CR-CAs). b Schematic illustration of pH-dependent structural transformation and related MR signal changes in CR-CAs. c Schematic illustration of the tumor-accumulation behavior of conventional micelle (1) and CR-CAs (2). d Contrast enhancement vs. time after CR-CAs and Ins-CAs injection. e In vivo biodistribution of CR-CAs and Ins-CAs in CT26 bearing BALB/c mice. f Contrast enhancement efficacy of CR-CAs and Ins-Cas [65]Back to article page