Fig. 4From: Impact of tissue transport on PET hypoxia quantification in pancreatic tumoursSchematic of our partitioning model. From left to right: at t=0 (left panel), tracer (gray-filled regions) is only in the capillary; for \(k^{-1}_{1}\ll t\ll k_{\text {eq}}^{-1}\) (middle panel), tracer fills the rapid-equilibration regions and begins to bind where hypoxia arises; for \(t\gtrsim k_{\text {eq}}^{-1}\) (right panel), tracer fills all regions, including the slow-equilibration regions that occupy a volume fraction v s of the region of interestBack to article page