304 Eur Radiol (2012) 22:302–309 consistent image quality across the different sites and systems. Eleven different CT systems from four manufac- turers were used to obtain the 96 CT studies. Images were obtained at maximum breath hold to total lung capacity after careful breath hold coaching (120 KV, 80 to 110 mAs; reference mAs for regular to large patients). Informed consent and IRB approval for participation in the trials and for the analysis of the images by our imaging laboratory was obtained for each participating centre. Visual fissural completeness scores Before analysis, visual assessment of fissural completeness was performed by carefully inspecting the axial, sagittal and coronal views, without any reference to the computer output. For visual scoring a trichotomous scale was used: complete, partial, and absent. The fissure was scored as complete when it was thought to be visually complete and there was no evidence of bronchovascular structures Fig. 2 a: Descriptive statistics for the 96 CT studies used in this paper for the automatic method. b: Descriptive statistics for the 96 CT studies used in this paper for the visual consensus read