DICOM INTERNATIONALCONFERENCE & SEMINAR

Oct 9-11, 2010 Rio de Janeiro, Brazil

WADO: a useful tool for remote visualization of

large DICOM files

Bmed. Eng. Pedro Pablo Escobar

Fac. Of Engineering / Univ. Nac.del CentroHealth Technologies Group

Introduction

• Increased digital medical equipment availability that produce DICOM images

• Applications for Computer-Aided Diagnosis (CAD)

• Picture Archiving and Communication Systems (PACS)

Web-PACS

• Enable to query PACS server from a Web Site• Only need a WEB browser

Medical images Web Viewer

• Web browsers do not have capacity to display DICOM studies

• Web-PACS includes DICOM viewer• Java, Flash, ActiveX

Medical images Web Viewer

• Time-to-display (TTD) • Lossless Compression 1:3• Lossy Compression 1:100• Progressive image transmission (PIT)• Deployment

Dcm-Ar: System Architecture

• WADO (Web Access DICOM Objects)

• Easy Web PACS Viewer integration

Dcm-Ar Client

• Developed in OpenLaszlo -> Flash App.

• Has implemented the PIT strategy

Dcm-Ar Client

• Image divided in fixed size tiles

Dcm-Ar Client

• IOPIT Interactive - Optimized PIT

Dcm-Ar Server

• Multithreads Java2EE Application.• Use Dcm4Che library• Run over Jetty Java Servlet Container

Tasks:– get images from PACS– make image tiles– send to client requested data information and tiles– manage image data cache

Results

• Multiplatform system has developed

• Reduce TTD in:– 14 times than RAW images– 5 times than PNG (lossless) images

E.g. Image 25Mb

Bandwidth 512kbps ~=64 kb/s

Raw 400s ~= 06:40

PNG 80s ~= 01:20

IOPIT 26s ~= 00:26

Future Works

• Development of Web-PACS viewer using WADO• TTD strongly reduced -> IOPIT technique• Suitable solution for:

– rural areas with narrow Internet connections– emergency or disasters situations– remote online diagnostics

Future works• Build generic WEB-PACS that work with any DICOM

PACS server• Adapt the viewer solution for mobile devices

Future Works

Thank You...

PD1: Apologizes for my rude english...

PD2: Rio is a great place for a congress

PD3: you can ask me whatever you want... probably I do not have all the answers, but I

can give you my email address :)

Authors

Pedro Escobar Faculty of Engineering, UNICEN.

Emanuel Arguiñarena Doths Engineering S.A.

José Macchi Tsavo Group S.R.L.

Mariana del Fresno PLADEMA, UNICEN.

José M. Massa INTIA, UNICEN.

Martin Santiago IFAS, UNICEN.

Contact: pescobar@fio.unicen.edu.ar