DICOM INTERNATIONAL CONFERENCE & SEMINAR Oct 9-11, 2010 Rio de Janeiro, Brazil The Right, the Wrong and the Ambiguous: Tales from the Trenches of Data.

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DICOM INTERNATIONAL CONFERENCE & SEMINAR Oct 9-11, 2010 Rio de Janeiro, Brazil The Right, the Wrong and the Ambiguous: Tales from the Trenches of Data Migration Fred M. Behlen, Ph.D. Razvan Costea-Barlutiu LAITEK Inc., Homewood, IL USA

Disclosure Fred Behlen –Officer, Director & Shareholder LAITEK Inc., a data migration services provider

PACS Data Migration Old PACSNew PACS Work in data migration provides opportunity to witness the varied ways that the DICOM Standard is interpreted, misinterpreted or ignored in real-world implementations.

Today’s talk Feedback from the Real World of DICOM Implementations –The Right –The Wrong –The Weird –The Troublemakers –The Ambiguous

The Wrong Generating new UIDs on every retrieve –Study, Series and SOP Instance UIDs –Original UID sometimes in another attrubute Non-Unique UIDs Over-length fields –(0018,0015) Body Part Examined (CS) > 16 char C-MOVE Final Status returned before sub-operations complete

The Weird C-FIND –Multiple return records for the same Study Duplicate copies of images –Same Image, Same UID –Same Image, Different UID –Different Image, Same UID Changing Study UID to match HL7 order –Study is sent & stored, but can’t be found

The Troublemakers Studies with Zero images –Created by HL7 interface & forgotten Can’t C-FIND studies with null Study Date Increasing use of proprietary annotation –Expendable if merely illustrative –Must be preserved if it contains clinically significant information, e.g. corrections to laterality markers

Troublemakers (cont’d) Transient errors –No problem if detected (simply re-fetch) –May be insidious in migration –Automatic detection needed

The Ambiguous Cardinality of Accession Number to Study UID – two camps 1.1:1Accession Number uniquely identifies Study 2.1:NMultiple studies may share same Accession Number N:1(Grouped Procedures) variously addressed  Migrating from Camp 2 to Camp 1 requires Study merges

Conclusions Overall fidelity of migrations is high, thanks to DICOM DICOM compliance is improving More annotation being used, needs DICOM implementations for portability Some tightening of DICOM specs on Query/Retrieve behavior will help There will always be stuff to fix when data moves to a new system