Fig. 3

Illustration of the different steps of the interactive diaphragm segmentation tool. a Fifteen sagittal slices are selected uniformed in the axial view based on the peritoneum segmentation result. b Twelve ray casts are generated automatically on a selected sagittal slice. c These ray casts can also be automatically computed based on high gradient between the diaphragm and the lungs (marked by the blue circle) d A quad mesh represents the diaphragm position is computed using all the generated points from previous segmentation