Plots showing the correlation between of average intensity and two qualitative metrics for images obtained at different time frames.

<p>(A)-(E): Illustration of the DIF/REC ratio (red dash dot curve), OVL/REC ratio (green dash curve) and averaged intensity (blue curve) in the tumour region of interest across for the five tumour cases considered. The <i>x</i>-axis labels the six different time steps, and the <i>y</i>-axis labels the scaled value of each ratio and intensity.