Progressive and interactive modes of image transmission: optimized - - PowerPoint PPT Presentation

Progressive and interactive modes of image transmission: optimized wavelet-based image representation

Artur Przelaskowski Paweł Hałasa Dominik Rives

Institute of Radioelectronics, Warsaw University of Technology, Poland arturp@ire.pw.edu.pl

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Outline

Context: Teleinformation medical system

(PACS-RIS-telediagnosis-reference database)

Props1: Interactive progression (user

interface)

Props2: Image indexing (reference database) Props3: JPEG2000 as medical (teleradiology)

standard

Props4: Faster encoder (archiving and

transmission)

Props5: Effective encoder (optimized) Conclusions (use it!)

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Context: Teleinformation Radiology System

Laboratory Registration Analyses Room Results Reports System/database Medical Order Medical Issue

Reports Patients Exam. Results Analyses Regist. Stuff

Central Unit (medical center)

Client Client (specialist)

network connections Wi-Fi Indexing Retrieval engine

Reference database

Interactive codec and data transmission protocols

Mobile Client

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Progressive Interactive Internet Codec

Teleconsultings and picture sharing

with other system clients

Multi-platform, system independent

architecture

Progression modes Region of interest (ROI) progression Interactive protocols Inteligent User Interface

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Progressive image data stream decoding

After 0.5% After 2% After 100%

• !"#$!!%

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)*$!!"!$

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Interactive image exchange (JPEG2000 data stream)

selected ROI

flexible XML-based control connection high performance image stream via UDP Simple image transmission protocol (SITP)

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• +

,+-'.

)*$!!"!$

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Image database indexing and retrieval

Reference diagnostic database Index in wavelet domain User Boxes (JPEG2000 data stream) Fast and precise retrieval Web access

Indexing Retrieval engine

Reference database

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Reference database

76% MMG 80% MR 84% CT Tanimoto, Var, LH, max n Correlaction, ADev, HL, max n Manhattan, Var, HH, max n Images

Profiles

Precision:

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JPEG2000 is medical standard? YES

DICOM:

it allows transmission of images with

improving resolution and quality, which will be extremely useful in teleradiology and in some PACS network environments

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JPEG2000 is medical standard? NO: irreversible compression

scientific community has not come to a

consensus

fear: valuable information might be lost

through compression

DICOM does not, and will never,

“approve” compression schemes for any particular use

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JPEG2000 is medical standard? YES

„avoiding all risks is the risk ” DICOM: professionals make decision

and take responsibility

Litigation risks: regulators rely on the

professions to lead the way

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Faster JPEG2000 encoder

Optimized PCRD: improvement of Jasper C

implementation (JPER)

Solution: Sorting instead of iterative

bisection

Effect: multi-layers coding without additional

time costs

Faster archiving and transmition (reduced

time costs, reduced memory costs, simplicity)

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Basic idea of PCRD in Jasper

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Basic idea of PCRD in JPER

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Experimental Effects

1 2 3 4 5 6 7 1 10 20 30 40 50

number of layers

compression time

J a s p e r JPER

progression

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JPER2000

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Increased compression efficiency

• Reduced bit rates
• Selective compression: diagnostic

quality progression

• Profiles (e.g. for mammograms: 17/11

filter bank, 8 levels of diadic, nz=0.6, layer progression, code-blocks 64x64)

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The results: diagnosis based on JPEG2000 compressed images

0.1bpp 0.05bpp

0,2 0,4 0,6 0,8 1 1,2 1,4 1,6 0.01 0.05 0.10 0.20 0.30 0.40 0.50 0.80 0.90 1.0

TP/(FP+FN+1) bit rate

Quality subjectively: 1bpp

12bpp 0.3bpp

ROC-based detection: 0.1bpp CAD: 0.9bpp mammograms

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Conclusions

JPEG2000 is flexible enough for

telediagnosis (teleradiology)

Implemented improvements enhanced

information exchange

Clinical experiment are required to

verify our complex system

Please, use it! It works!