Figure 6. The trans endothelial transfer coefficient (Ki) maps produced from the PNs A. and Gd-DTPA B. The Ki map produced from PNs include discrete areas of high Ki within the tumor rim that are difficult to discern in the equivalent Gd-DTPA Ki map.

This is largely due to the small molecular size and considerably greater extraction of Gd-DTPA relative to PNs.