1 Hector DUQUE, Creatis/LIRIS Johan MONTAGNAT, Creatis Jean-Marc PIERSON, LIRIS Lionel BRUNIE, LIRIS Isabelle E. MAGNIN, Creatis DM 2 : A Distributed Medical Data Manager for Grids. CREATIS, CNRS UMR 5515 (Centre de Recherche et d'Application en Traitement de l'Image et du Signal, Lyon, France) LIRIS (LISI), CNRS/INSA FRE 2672 (Laboratoire d'InfoRmatique en Image et Syst ₩ mes d'information, Lyon, France)

2 Goals – To supply a Distributed System for the medical community able to deal with medical images and sensitive medical metadata – To provide hybrid content based queries and metadata queries over large databases of medical images (image processing) – To transparently use GRIDS in order to get advantage of its computing power and its massive storage capacity – To propose an arquitecture for developing this kind of systems (DSE: Distributed System Engines)

3 challenges – content-based queries over images – Image processing – Interfacing Grids and Image Archiving Systems – distributed queries – massive storage – high performance computing

4 " Very large databases of images with a very long term storage " Data distributed over acquisition sites " Sensitive medical data (strong security constraints) " Read-only access to raw scanner data (replicas needed) " Keep track of data processing " Different kinds of users (patients, physicians and researchers) medical data constraints

5 applications " Hybrid queries to images's databases of Mammography and IRM cardiological sequences - metadata - parametric analysis (indexing) - content processing " Similarity queries Source image (e.g. thorax, MRI) Target images (thorax, MRI) Most similarLess similar Similarity measures

6 DSE hospital a distributed system = set of engines GRID messages DSE: Distributed Systems Engines USER IRM

7 DSE0 DSE4 DSE3 DSE2 DSE1 0 message passing 0 distribution 0 Application 0 DM 2 0 transaction 0 user 2-middleware 3- applications semantic level 1-DSE Distributed Systems Engines (multilayer architecture) 1- definition of a multilayer architecture 2- implementation of the middleware level 3- implementation of the application level

8 (1) -Architecture (DSE1) Tool Drivers (TOD) Request Drivers (RQD) server machine client machine Task Drivers (TKD) DSE1 = a set of drivers Transaction Drivers (TRD) a transaction is a set of tasks a task is a set of requests a request is a set of messages message passing kernel (MPK)

9 network IPC client machines server machines messages TRD RQD TKD TOD (2) - middelware

database_tkd cache_tod dicom_tkd grid_tkd DM2_qud < 7005 random source (normal/poisson distribution) MYSQL_rqd >8080 DICOM_rqd SE_rqd>7007 virtual_rqd > N img * 10 slices 4 images_tod security_tod hosp t0 N images N*10 files tn query 1 image sequence == 10 dicom files

hours (3000 x 3 sec / 3600 sec x 3 sec / 3600 sec))

hDSEM0 vs PVM (not remote) 500, 1000, messages Kbytes

METADATA TKD Grid TKD DM2 TRD DM2 image = {DICOM file} METADATA Grid DM2 CLIENT (DM2 API) heart mammo Security TOD (3) Application (usecase): A physician queries DM 2 to find all images similar to an image of interest 1 request similar images to an imageID 2 METADATA RQD DM2 RQD Grid RQD Cache TOD Images TOD

in summary " The DM 2 architecture is designed for high performance and extensibility. " The proposed architecture (DSE) is appropriate for developing distributed medical systems. " The concept of multilayered architecture has allow us to deal with the design and development of a complex system as a distributed medical application is. " Computing GRIDS are very useful for medical image storage and analysis (distributed data, high processing power). " The DM 2 system allows the physicians to get secure access to their data and to issue hybrid requests over huge databases.

papers: - [Jun submitted] H. DUQUE, J. MONTAGNAT, J.M. PIERSON, L. SEITZ, L. BRUNIE, I.E. MAGNIN, An Architecture for Large Scale and High Performance Medical Imaging Applications, Parallel Processing Letters, special issue on grid computing for bioinformatics applications, [January 2003] J. MONTAGNAT, H. DUQUE, J.M. PIERSON, V. BRETON, L. BRUNIE, I.E. MAGNIN, DM2: Medical Image Content-Based Queries using the Grid, Healthgrid 2003, January 15th-16th, Lyon, France - [January 2003] H. DUQUE, J. MONTAGNAT, J.M. PIERSON, L. BRUNIE, I.E. MAGNIN, DM2: A Distributed Medical Data Manager for Grids, Biogrid 2003, may 12th-15th, Tokyo, Japan

This work is partly supported by: / the IST European DataGrid project / the French ministry for research ACI-GRID project www-sop.inria.fr/aci/grid/public / ECOS-Nord Committee (action C03S02)