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2016 ; 29
(3
): 309-13
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English Wikipedia
DICOM Data Warehouse: Part 2
#MMPMID26518194
Langer SG
J Digit Imaging
2016[Jun]; 29
(3
): 309-13
PMID26518194
show ga
In 2010, the DICOM Data Warehouse (DDW) was launched as a data warehouse for
DICOM meta-data. Its chief design goals were to have a flexible database schema
that enabled it to index standard patient and study information, modality
specific tags (public and private), and create a framework to derive computable
information (derived tags) from the former items. Furthermore, it was to map the
above information to an internally standard lexicon that enables a non-DICOM
savvy programmer to write standard SQL queries and retrieve the equivalent data
from a cohort of scanners, regardless of what tag that data element was found in
over the changing epochs of DICOM and ensuing migration of elements from private
to public tags. After 5 years, the original design has scaled astonishingly well.
Very little has changed in the database schema. The knowledge base is now fluent
in over 90 device types. Also, additional stored procedures have been written to
compute data that is derivable from standard or mapped tags. Finally, an early
concern is that the system would not be able to address the variability DICOM-SR
objects has been addressed. As of this writing the system is indexing 300 MR, 600
CT, and 2000 other (XA, DR, CR, MG) imaging studies per day. The only remaining
issue to be solved is the case for tags that were not prospectively indexed-and
indeed, this final challenge may lead to a noSQL, big data, approach in a
subsequent version.
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