Eur Radiol (2012) 22:302–309 307 Fig. 5 a: ROC curves comparing the automatic continuous complete- ness score with those of the individual readers and the consensus read for the right major fissure. b: ROC curves comparing the automatic continuous completeness score with the individual readers and the consensus read for the right minor fissure. c: ROC curves comparing the automatic continuous completeness score with those of the individual readers and the consensus read for the left major fissure Table 2 Summary of studies evaluating fissural completeness using computed tomography. The percentages in columns 4–6 indicate the percentage of CT studies for which incomplete fissures were observed Study Year # CT Left studies major Aziz et al. [1] 2004 662 43% Right major 48% Right minor 63% Remarks Gülsün et al. [2] 2006 144 59.7% 62.5% – Mahmut and Nishitani [6] 2007 1000 18.6% 17.4% 20.4% Ozmen et al. [7] 2010 387 Cronin et al. [3] 2010 150 48.3% 25.3% 69.7% 34.0% 86.9% 48.3% 259 out of 921 were omitted because of pulmonary disease; minor fissure only seen in 78% of CT studies. Visual inspection showed that the extent of incompleteness was larger in the right major than in the left major fissure. CT studies were selected to be disease-free or containing mild pulmonary disease that did not affect the orientation of the fissures. Only 25 out of 144 CT studies showed complete major fissures in both lungs. 254 out of 1254 cases were omitted because of lesions close to the fissures. Incomplete was defined as more than 1 cm missing. Uncertain cases were omitted. 121 patients excluded because of abnormalities Patients selected not to have pulmonary disease or previous pulmonary surgery; no minor fissure found in 3.3% of cases.