Fig. 7

Deviation of size estimates for 50 ml phantom. The calculated volumes for the 50 ml phantom, of Chan–Vese and Otsu method, relative to true size per relative background concentration (rows from bottom to top show 5 %, 10 %, 15 % and 20 %) and relative hotspot activity concentration (columns from left to right show 100 %, 150 %, 200 % and 250 %). The figures below each panel show the deviation (in percentages) from true size