Fig. 4From: 3D printed ventricular septal defect patch: a primer for the 2015 Radiological Society of North America (RSNA) hands-on course in 3D printing Region Growing segmentation process. Region Growing can be selected from the Menu Toolbar (1) or from the Segment tab (2). A seed point is selected by left clicking a seed point in the heart atrium (3). Once selected a yellow mask is generated and the Region Growing window can be closed (4)Back to article page