Key Object Selection (KOS)

Build or edit a Key Object Selection document flagging significant images.

Problem

Within a multi-slice DICOM series, you need to flag specific slices as “key images” — the most representative or diagnostically significant frames that a referring physician or AI model should focus on. Key Object Selection creates a DICOM Key Object Selection Document (KOS) that references these selected images.

Steps

1. Open the DICOM file (⌘O) and navigate to the frame you want to mark.

2. Click MARK KEY in the StatusBar at the bottom of the viewport. The button toggles to KEY IMAGE, confirming the current instance is marked.

3. Click KEY IMAGE again to unmark it (returns to MARK KEY).

Result

The toggle switches the current instance between “MARK KEY” and “KEY IMAGE”, tracking key images in app state for export as a Key Object Selection Document; you can mark several across a study, shown as badges in the StatusBar.