Fig. 3
PET transaxial images (a, b, the colour scales are the same), histograms (c, d) of the heterogeneity contributions (the mean intensity deviation per distance calculated according to Eq. 2) and surface plots (e, f) of the uptake of AnxA5 and mTrx-GFP in a FaDu xenograft. The imaging was performed in the same animal >2 h apart on the same day. In e and f, the X- and Y-axes represent spatial dimensions and the Z-axis is the mean tracer uptake (SUVmean)