Distinguish source modality

I've problem identifying the study.

Here's the situation:
Two clinics have same model Fujifilm x-ray modalities with local pacs. The local pacs forwards images to central hospital Conquest pacs. Is there a way I can uniquely distinguish study is coming from which clinic?

Clinic1:
Fujifilm modality forwards the images to local pacs with default ae_title e.g. "AETITLE"
The local pacs forwards the images to centrally located hospital Conquest PACS.
e.g. studyid = 1.2.392.200036.9125.2.3079200157247.64584720960.24602

Clinic2 at different location:
Fujifilm modality forwards the images to local pacs with default ae_title e.g. "AETITLE"
The local pacs forwards the images to centrally located hospital Conquest PACS.
e.g studyid = 1.2.392.200036.9125.2.26160169177194.64584817748.24162

Now conquest PACS is receiving images from both clinics. Earlier idea was to identify the clinics by the originating ae_title. But don't ask me why but changing the default ae_title of forwarding local pacs is not an option. Also can't rely on institute tag as it's not filled in consistently.

My question is - Is there a way I can distinguish study is coming from which clinic?
Is there a tag or combination of tags which can help differentiate which clinic the study belongs to?

Unfortunately Institute tag is not always filled in and patientId is not guaranteed to be unique among two clinics.

Clinic 1 studyid: 1.2.392.200036.9125.2.3079200157247.64584720960.24602
Clinic 2 studyid = 1.2.392.200036.9125.2.26160169177194.64584817748.24162

From the studyid - 1.2.392.200036.9125.2 -> rootid + first two suffixes are common. Should I look at the modality if there is a UID string they use and is this common for all modalities?

I would appreciate any kind of input or direction to resolve this issue - thanks in advance.

-Vinod

Thanks Scott - that looks like a good solution. I didn't think of converters.

Is there a generic solution based on Dicom tags which can distinguish that, so I don't have to add new converters when additional clinics are added. I mean independent of converters?
Thanks
-Vinod

Hi Marcel,
How can I access n-digit of UID in dicom.ini?

Stationname is default to be same and originator is not filled in reliably.

Do UID have any meaning? I thought you cannot rely on them to parse. If there is s reliable way in the structure then I would like to use them to distinguish the clinic.
E.g.
1.2.392.200036.9125.2.26160169177194.64584817748.24162
1.2.392.200036 -> rootid
9125.2 -> first two suffixes are common among two clinics.
Should I look for 2 suffixes after rootid and is it consistent for all modalities?

Thanks
V