Edit segments and VOIs
Edit, name, hide or delete segment and VOI regions.
On this page
Read the cursor
Image tools use pointer + tool icon. Segmentation / VOI interiors show Move; edges and handles show Resize. Drag outside existing regions to create another.
Crosshair priority
With ordinary tools, crosshair hits take priority for positioning or rotation. Enabled segmentation / VOI takes over region editing. Switch to Windowing or another tool to use crosshairs.
Cancel and delete
Click the image for keyboard focus. Esc cancels drawing or editing; Delete / Backspace removes the selection. Keys in input fields edit text only.
Select and name
Click a name to select; double-click to rename. The eye button toggles visibility, and the delete button removes the item. Unchecking Enabled hides that region type and pauses drawing.
Important
Clear regions
Clear segmentation / Clear VOI removes that type. Clear all removes both region types in the current MPR tab without affecting other tabs. In 4D, both actions affect only the current phase; regions in other phases remain.
Important
Continue later
A workspace preserves regions, segmentation masks, the selected region, paint/erase mode, diameter and scope. Uncommitted strokes are not saved; playback stays paused. Export statistics in measurement reports and exchange segments via SEG / NRRD. Structured SR export is supported; RTSTRUCT and SR import remain unavailable. Closing unsaved tabs loses their results.