There is no place in the Symantec Management Console to rename a OS image. However, it can be accomplished using the following procedure.
1) Open the image in the image explorer. That could be Ghostexp or imgexp. The explorers are found under 'ghost' or 'rdeploy' typically at:
7.1 - C:\Program Files\Altiris\Altiris Agent\Agents\Deployment\Task Handler.
7.5 & newer - "C:\Program Files\Altiris\Deployment\Imaging\ghost\x86\GhostExp86.exe"
-or- "C:\Program Files\Altiris\Deployment\Imaging\ghost\x64\GhostExp64.exe"
2) Save the image under the new name. This wil be a temporary version of the OS file.
3) Use the Resource Import Tool to import the new version of the image. Note: Typically, images for deployment are prepared using Sysprep.
4) Delete the original image and the temporary version. The ResourceImportTool makes a separate copy of the image file.
The original image location can be found by looking at the image package location in console under 'All Settings > Settings > Deployment > Disk Images'
5) Remove the resource for the older version of the image. This is located in the console under 'Manage > Resource'.
From the dropdown locate 'Software Component' and then select 'Image Resource'.
Find the listing for the old version of the OS image. Click OK and delete.