Bland-Altman analysis. Bland-Altman plots of the maximum tumour diameter obtained using CT- (A) and various PET-based (B-I) delineation methods versus those derived from pathology. Dashed lines represent limits of agreement (±1.96×SD of the mean). Arrows indicate two patients with large heterogeneous lung tumours. Note that two outliers from VOI50, VOIA41 and VOISchaefer fall outside the range of the figure (i.e. >110 mm).