Injecting private DICOM tags into received instances

General
1

I’d like the ability to automatically inject private DICOM tags into received instances. The private tags will be pre-defined in the orthanc config files (the private tags will have static values).

As of now, I’m doing this via lua/python plugin by intercepting the OnStoredInstance hook. However, it uses multiple REST calls overwrite the metadata.

Here’s my code:

function OnStoredInstance(instanceId, tags, metadata, origin)
   if origin['RequestOrigin'] ~= 'Lua' then

      local replace = {}
	  replace["00xx,00xx"] = "some data"
	  replace["Private_Tag_Defined_In_Dictionary"] = "more data"
	  replace["SOPInstanceUID"] = tags["SOPInstanceUID"]

      local remove = {}

      local command = {}
      command['Replace'] = replace
      command['Remove'] = remove
	  command["Force"] = true
      local modifiedFile = RestApiPost('/instances/' .. instanceId .. '/modify', DumpJson(command, true))

      local uploadResponse = ParseJson(RestApiPost('/instances/', modifiedFile)) ['ID']
 
      if (uploadResponse["Status"] == 'AlreadyStored') then
         print("Are you sure you've enabled 'OverwriteInstances' option ?")
      end

      if (uploadResponse["ID"] ~= instanceId) then
         print("modified instance and original instance don't have the same Orthanc IDs !")
      end 

      print('replaced Private Tag in instance ' .. instanceId)
   end
end

I’d like to know if this can be done in the core DICOM server. Ideally, the tags would be injected upon receiving images.

2

Hi,

The Orthanc core will not allow injecting a tag by configuration - this is not a generic use case so we won’t add this as a feature in the Orthanc core.

However, there is an alternative solution: inject the tag before the instance is even read/interpreted by Orthanc. This can only be done in python with this callback.

Hope this helps,

Alain

1 Like
3

Thanks for the pointer! The ReceivedInstanceCallback is more efficient and cleaner than my Lua/REST code. Much appreciated.