EllipticalRoi Tool

// Init cornerstone tools
cornerstoneTools.init();

// Enable any elements, and display images
// ...

// Add our tool, and set it's mode
const EllipticalRoiTool = cornerstoneTools.EllipticalRoiTool;

cornerstoneTools.addTool(EllipticalRoiTool)
cornerstoneTools.setToolActive('EllipticalRoi', { mouseButtonMask: 1 })