def METHOD_NAME():
    from mmc.plugins.base.computers import ComputerManager
    from mmc.plugins.base import LdapUserGroupControl
    # Get all imaging targets
    targets = ImagingDatabase().getAllRegisteredComputers()
    # Creating root context to query ComputerManager
    ctx = SecurityContext()
    ctx.userid = 'root'
    ctx.userdn = LdapUserGroupControl().searchUserDN(ctx.userid)
    # Init to_delete computer list
    to_delete = []
    for uuid in targets:
        if ComputerManager().getComputerCount(ctx, {'uuid': uuid}) == 0:
            # If the target computer is not in ComputerManager database anymore
            # we unregister it from imaging
            to_delete.append(uuid)
    # Unregistering orphan targets without backup
    if to_delete:
        logging.getLogger().info('Orphan imaging computer(s) found')
        logging.getLogger().info('Going to purge %s' % ' '.join(to_delete))
        computersUnregister(to_delete, False)
    return True