b<>com Rest DICOM Library A portable DICOMweb™ toolkit Amandine Le Maitre, Guillaume Pasquier, Eric Poiseau, Abdelghani Tassi, Guillaume Gauvrit, Emmanuel Cordonnier, Yannick Morvan bcom presentation - non profit organization - open innovation institute (public private partnership) We are investigating 3 domains: imaging technologies (e.g. video coding or augmented reality), telecommunication and network technologies and Medical imaging

Motivations Increasingly, medical specialties incorporate images for diagnostic and treatment Image usage becomes distributed: enterprise wide or even cross-enterprise Software challenges of conventional DICOM standard and PACS’s High complexity of the communication protocol Low performances for specific dataset Not adapted to web applications Interrupted transfer of large objects (multiframe, enhanced IOD, WSI, MPEG) cannot be resumed Difficult to deploy cross-enterprise DICOMweb™ addresses a number of these issues Next steps for DICOM is DICOMweb™ (copyright Carestream Health) Dedicated fixed radiology workstation (copyright Carestream Health) Mobile imaging application

Part B b<>com Rest DICOM Library Server Module

Overview of our DICOMweb™ Server RESTful DICOMweb WADO, QIDO, STOW Goal: implement a gateway providing DICOMweb™ interfaces to any PACS Universal: simple integration into existing PACS Lightweight: <3 MB Standalone: all included and easy to deploy Working towards the conformance to DICOMweb™ DICOM C-Store, C-Find, … Rest DICOM Library Gateway/DICOMweb-izer DICOM C-Store C-Find DB proprietary PACS

Architecture of our DICOMweb™ Server Delivered as an Apache 2 module (tested version 2.2 and 2.4) Dependencies: DCMTK and POCO (all included) Tested on Centos 6.x, Debian 9/Stretch and Ubuntu 14.04 Color coding client/server

DICOMweb™ Server Backend DICOMweb™ requests can be converted either SQL, ODBC or DICOM connections RESTful DICOMweb WADO, QIDO, STOW Rest DICOM Library SQL proprietary (preliminary tests on Dcm4Chee) ODBC proprietary (tested on ETIAM® Nexus™) DICOM C-Store C-Find

Part C b<>com Rest DICOM Library Client Module

Overview of b<>com REST DICOM Client Goal: implement a toolkit that enables the communication to a DICOMweb™ server from a web browser Zero-footprint: implemented in JavaScript Working towards the conformance to DICOMweb™ AJAX-based Include goodies: Can parse DICOM objects in the browser (JavaScript) Can create new DICOM objects (e.g. KOS) in the browser (JavaScript)

b<>com Rest DICOM Library in Action DICOMweb™ QIDO-RS client - 1/3 Build QIDO requests at all levels (studies, series, instances) JSON parsing of QIDO response Simple integration of the QIDO-RS response for WADO-RS Display button build from QIDO response

b<>com Rest DICOM Library in Action DICOMweb WADO-RS client - 2/3 Get the series using WADO-RS Parsing of the multipart WADO-RS HTTP response Wish list (1): WADO rendering Wish list (2): Cornerstone integration

b<>com Rest DICOM Library in Action STOW-RS client - 3/3 DICOM object parsing in JavaScript Upload studies using a STOW request JPEG-LS transfer syntax conversion in JavaScript (work in progress) KOS creation as first object in the multipart of STOW Goodie: we can resume an interrupted STOW-RS (requires a slight modification of STOW-RS) Mime type: multipart/byterange combined with QIDO returning the offset Adding the transfer syntax in the HTTP header to avoid conflict with simultaneous uploads

b<>com Rest DICOM Library Grammar-Based Request Parsing

Grammar-Based Requests Parsing Take advantage of the supplement 183, “re-documentation” by Jim Philbin Idea followed is to employ the grammar definition to verify and parse incoming DICOMweb™ requests (grammar-based parsing) Parsing includes Syntax analysis (e.g. a typo “study" instead of "studies“ in the URI). Semantic analysis age of the patient is not formatted as an AgeString VR. Why not integrating that validator into IHE gazelle EVS client? Parsing is used to analyze the request and build either a proprietary SQL query or a DICOM standard command

Grammar-Based Requests Parsing Server Side Within the server, verify the conformance of the incoming messages Simplify the analysis of the incoming request Extracted request parameters can be forwarded to build an SQL or C- STORE query

Conclusions b<>com Rest DICOM Library includes a portable server and a zero- footprint JavaScript client module The toolkit provides a subset of the DICOMweb™ interfaces (part of STOW-RS, QIDO-RS and WADO-RS) The server is employed as a gateway to a standard PACS The JavaScript client provides STOW-RS upload (JPEG-LS compression, DICOM de-identification and resumable upload) Regular WADO-RS and QIDO-RS Software verification and validation following ISO 13485 guidelines Preliminary field tests performed with our partner (ETIAM) Future work: DICOM conformance statement, compatibility verification (Windows, Mac OS X)

Author Contacts Yannick Morvan Connected Healthcare Lab Manager yannick.morvan@b-com.com b<>com Institute of Research and Technology