DICOM INTERNATIONAL
CONFERENCE & 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 Centro
Health 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
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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