Guide for labeling medical imagery.


When you attach a DICOM dataset to a project, the Labelbox Editor interface will automatically adjust for DICOM labeling.

For more information on the import format, see our docs on DICOM import format.

Supported annotation types

Below are all of the annotation types you may include in your ontology when you are labeling DICOM data. Classification-type annotations can be applied at the global level and/or nested within an object-type annotation.

Annotation typeImportExport
PolylineNot supportedSee payload

(Note: You must use the video segmentation tool)
Not supportedSee payload


Use the Polyline tool to label lines in a DICOM slice. Click on the last point to complete the shape.

Segmentation mask

Use the pen tool to outline the item in the image. Hold the cursor down to draw freehand or let the cursor go to draw straight lines between points. The pen tool is only available when creating segmentation annotations. Click the pen icon with the plus sign to use the pen tool.

Erase tool

You can use the erase tool to clean up the edges of a segmentation mask. Click the pen icon with the minus sign to use the erase tool.

DICOM-specific hotkeys

Opt + ScrollZoom in and out of the slice.
Control + Click + Pan up/downAdjust the contrast of the slice selected.
Control + Click + Pan left/rightAdjust the brightness of the slice selected.
Shift + ClickPan around the image.