Fig. 3
Representative T1 mapping imaging of heart a and aortaventralis b of one mouse after injection of Branched pDHPMA-mPEG-Ppa-PROXYL. The heart and aortaventralis were labeled with yellow and red arrow, respectively. The darker blue signals in the heart and aortaventralis suggest sharper enhancement in the MR images. The corresponding T1 values were spatially displayed in the heart c and aortaventralis d after injection of Branched pDHPMA-mPEG-Ppa-PROXYL at different durations. e The 1/T1 values for the heart and aortaventralis were quantitatively analyzed (n = 5, *p < 0.05, compared with pre-injection)