Fig. 3From: 3D printed ventricular septal defect patch: a primer for the 2015 Radiological Society of North America (RSNA) hands-on course in 3D printing Thresholding segmentation process. Thresholding can be selected from the Menu Toolbar (1) or from the Segment tab (2). In the Thresholding window (bottom right) a HU range from 440 to 3071 is set (3). After clicking Apply (4) the contrast material in the heart and vessels appears green in the imagesBack to article page