Press Contours Tool on 2D view panel, contours panel (Fig. 1) and List of ROIs widget will appear (Fig 3)
Fig. 1
Select Draw mode to draw in 2D view - only in Slice view (s. upper toolbar of 2D view)
Fig. 2
To draw free - hold left mouse button and move mouse
To draw lines - hold SHIFT andleft-click
Do not cross image border
Click at newly drawn contour to select it
To close contour is recommended to select created contour and use Open/close button, according to DICOM specification last point should not duplicate first point, the contour will be marked as CLOSED_PLANAR at export to RT Structure Set
To add contour to ROI select it and click at Plus button
Do not change slice or select another image before contour is added to ROI, drawing will be lost
To go to next slice right-click in 2D view, to go to previous slice CTRL - right-click, draw mouse wheel over slider
Pressing f or 0 key, having focus in 2D view, will fit an image into the view, 1 shows image in original size
Edit Properties
To to open Menu right-click in the List of ROIs widget