SmartBrush is an image segmentation tool that offers advanced outlining functions to help you, e.g., distinguish healthy tissue from tumors. When you select an area to outline, the software automatically fills in regions of gray value similar to the selected area.
The software builds up these segments for each image slice and renders them into a 3D object.
SmartBrush within a Spine SRS workflow automatically generates a clinical target volume (CTV) and an Organ at Risk (OAR, cropped) based on a manually drawn object (Gross Tumor Volume or GTV). This target volume can be used for further planning steps.