If you're asking about Mozaix, you can import image files in version
3.1_03A. The release note:
Users of Mozaix may now add image files (.jpg, .gif, .bmp, .png, .tif,
etc.) to a sheet by utilizing the 'add image' edit mode. The mode is
available from Sheet > Graphic > Image File in the pull-down menus, or
from the right-click edit menu in an open sheet at Add > Image File.
The Add Image mode will prompt a user to first specify the image file,
and will then display a preview and allow the user to set the size and
rotation of the image prior to placing it. To change an image, first
select the image and go to Sheet > Graphic > Change Image File or go to
Change > Image File in the right-click edit menu.

If you're asking about Pantheon, I think you have to convert it to DXF
format and import it that way.