Neurobase: Sharing data and image processing tools in neuroimaging
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1 Neurobase: Sharing data and image processing tools in neuroimaging Bernard Gibaud 1, Christian Barillot 1, Eric Simon 2 Florent Aubry 3, Habib Benali 4, Olivier Dameron 5, Michel Dojat 6, Alban Gaignard 1, Serge Kinkingnéhun 4, Jean-Pierre Matsumoto 2, Mélanie Pélégrini-Issac 4, Lynda Témal 1, Romain Valabregue 1 1 VisAGeS, U746 Inserm/INRIA, IRISA, Rennes 2 Business Objects & Medience SA 3 U455 Inserm, Toulouse 4 IFR 49, Paris et Orsay 5 Ex-IDM, Inserm ERI1, Rennes 6 U594 Inserm, Grenoble 1
2 Context: research in neuroimaging Neuroimaging: to highlight the brain s morphology, functionality, physiology, metabolism, under normal and pathologic conditions Application Basic research Mapping of brain functions Modeling of cognitive functions, e.g.: vision, motor, language, memory, etc. Clinical applications Multiple sclerosis, epilepsy, etc Dementia and neuro-degenerative pathologies : Alzheimer, Parkinson, Stroke, etc. Descriptor = Activation V3A probability V3d V2d V1 V2v V3v V4 2
3 Context: ressources produced by research in neuroimaging Data, denoting knowledge about brain Functional maps Morphological and physiological abnormalities related to the various brain diseases Behavioral data Know-how Exploration methods: paradigms, imaging techniques e.g. specific MR sequences processing tools Segmentation, registration, quantification, etc. Statistical analysis processing pipelines Suitable for a specific problem 3
4 Neurobase : general objectives Optimise collaborative work in neuroimaging, through the sharing of data and image processing tools in order to: carry out large scale experiments re-useexisting image processing tools validatenew image processing tools Access to validation data sets Comparison to existing processing tools 4
5 Contraints Legitimate need for autonomy of the collaborating centres, regarding Local organisation of the data Sharing policy Data confidentiality Compliance to existing regulation 5
6 Neurobase : exploratory phase Creation of a suitable architecture to access distributed & heterogeneous data to integrate distributed components into specific pipelines With two specific objectives Creation of a domain ontology (semantic reference) Implementation of a demonstrator (to share data and image processing tools) 6
7 Partners VisAGeS et TeXMex projects, IRISA, Rennes IFR 49«Functional Neuroimaging» Paris & Orsay (CEA-SHFJ, INSERM U678, CHR Pitié Salpétrière) CARAVEL Project, INRIA Rocquencourt / Medience SA INSERM U594, Grenoble IDMLab., Fac of Medicine, University of Rennes I TIMC Lab. (SIC team), Grenoble EPIDAURE project, INRIA Sophia-Antipolis 7
8 Federated system Application Application Application Data access? Access to processing tools? Site #1 Data Proc. Tools Site #2 Data Proc. Tools Site #n Data Proc. Tools 8
9 Approach Application Application Application Mediator-based integration Common semantic reference Site #1 Data Proc. Tools Site #2 Data Proc. Tools Site #n Data Proc. Tools 9
10 Approach Application Application Application Mediator-based integration Common semantic reference wrapper wrapper wrapper Site #1 Site #2 Site #n Data Data Data Proc. Tools Proc. Tools Proc. Tools 10
11 Common ontology «a formal, explicit specification of a shared conceptualization» (Gruber 1993) Necessary to write applications and wrappers (entities, range of values) 11
12 Ontology: scope General concepts (upper level ontology) (non specific) General concepts of domain of interest (domain-specific) All other concepts of domain of interest (i.e. to deploy in a real life application) Ex: process, state, natural object, artefact, etc. Ex: patient, scan, study, pathology, image series, etc. Ex: interictal state (in epilepsy), deep brain stimulation (in Parkinson), design matrices (fmri), etc. 12
13 Neurobase ontology Scope Studies(subjects, experimental context, clinical aspects, etc.) Datasets and description of their content (images, ROI, registration data, etc.) processing (processing tools, processing, etc.) Method Integration of multiple sources (fmridc, DICOM, Neurobase partners experience) Representation : UML, then Protégé 13
14 Taxonomy Thing INRIA-Industry event, 24 january 2006 Event Process Object Artefact Information Group of people Scan -Session Assessment Study Body Data -Process -Processing Person Anatomical -Structure Acquisition -Equipment Processing -Tool Specification Report Data Experimental -Group 14
15 Datasets Thing INRIA-Industry event, 24 january 2006 Event Process Object Artefact Information Group of people Scan -Session Assessment Study Body Data -Process -Processing Person Anatomical -Structure Acquisition -Equipment Processing -Tool Specification Report Data Experimental -Group Dataset NonReconstructed Dataset Reconstructed Dataset Template Dataset Registration Dataset Segmentation Dataset MEEG Data MRRaw Data SPECT Projection CT MR SPECT PET MEG Current DipoleList Graph Mesh Multi Dimensional Static CT Dynamic CT MR Anat. MR Funct. Static PET Dynamic PET 15
16 Demonstrator Web Application Dataset selection based on user-defined criteria (subjects, studies, datasets) Execution of «dataflows» Display of results Software environment: Servlet container Tomcat Mediation system Publish and access the data Invoke the programs based on «Le Select» (Medience SA) 16
17 Le_Select (Medience SA) Initially developed in CARAVEL (Inria, Rocquencourt) Major features Uniform access to distributed heterogeneous data Application of transformations to data Data «published» according to a relational model, and accessed in SQL (e.g. using JDBC) Invocation of data processing programs on arbitrary datasets Fully distributed 17
18 Demonstrator architecture data base Perl C++ Java PostGres Client 1 Server S1 WD WP LeSelect WD 2D/3D Viewer Web Browser jdbc Internet Access jdbc http http LeSelect Tomcat Data Flow WD WP WD data base Perl C++ Java PostGres Server S2 18
19 Demonstrator deployment: 4 sites INTERNET Firewall Firewall Firewall Firewall Le Select Le Select Le Select Le Select IRISA (putamen) Grenoble Jussieu Fac Med. Rennes IRISA_NET MRI / PET epilepsy Dicom MRI / fmri human vision BALC MRI / fmri patho of vision BRAIN -VISA MRI / SPECT epilepsy Postgre -SQL Restoration Classif of tissues TomCat WebApp Apache IRISA (dopamine) Segmentation Dataflow selection, e.g. #2 dataset selection Client Demo INTERNET 19
20 Discussion - ontology Need to evolve toward a formal ontology i.e. expressed in a logical language (e.g. OWL) Necessary for : Management of «intelligent» queries Wrappers Articulated to formal and consensual «upper layer ontologies», e.g. DOLCE (Wonderweb) or BFO (Barry Smith et al.) interoperability with external terminology systems, e.g.: Unified Medical Language System (UMLS, NLM) Foundational Model of Anatomy (FMA, UW Seattle) Difficult trade-off Complexity / practical usability 20
21 Discussion: demonstrator Deployment of a real-life application (e.g. epilepsy or multiple sclerosis) would be a difficult challenge Significant implementation effort Mediation software powerful, but limited difficult to control (by a user community) Need for close partnership with research/industry same difficulties were reported in other projects, e.g. in the US, such as BIRN: Biomedical Informatics Research Network (NCRR, NIH) 21
22 Conclusion / perspectives Experience from exploratory phase very positive potential impact is important in neuroimaging, but also in other fields e.g. genomics, or cancer research (CaBIC) Work to be pursed Ontology Orchestration of dataflows Work on a real-life application necessary Major question : what mediator? «Le Select»? or «general-purpose»? such as a GRIDs Toolkit : Globus (GGF), SRB? 22
23 Acknowledgements Ministry of research (ACI) Regional Council of Brittany All other Neurobase contributors 23
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