Fig. 4

Examples of SPECT images and tumour VOIs for one phantom. a 24 h p.i. for ASR, b 24 h p.i. for AS, c 336 h p.i. for ASR, and d 336 h p.i. for AS. The green area is the VOI obtained directly from the phantom and the red contours are from the SPECT image segmentations. The SPECT images are shown in the background. The tumour volumes for each column in each sub-figure are 2.75 cm³ (left) 8.89 cm ³ (middle), and 40.0 cm³ (right)