DICOMweb support for retrieval via ZIP Bill Wallace Co-Chair of - - PowerPoint PPT Presentation

Overview:

DICOMweb support for retrieval via ZIP

Bill Wallace Co-Chair of WG-27: DICOMweb

Contents

• Background
• Changes Overview
• Exclusions
• Example Study Retrieve ZIP
• Example Study Metadata Retrieve ZIP

WG-27 DICOMweb 2

Background

• Multipart mime is poorly supported
• Not native to browser
• Few tools in OS
• Developer libraries are hard to use
• Very common for email only
• Need well supported file archive format
• ZIP supported natively in Windows
• ZIP supported natively in Java for developer use
• Libraries easy to use for others
• ZIP is a streaming format
• ZIP has a directory to allow finding files quickly

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Changes Overview

• Added ZIP Payload
• Analogous to Multipart payload
• Same sort of choices for Transfer Syntax specification etc
• BulkData URIs to items in ZIP are relative path URI
• eg. ./image0-bulkdata3.raw
• Contains either metadata + Bulkdata, or just

metadata

• Accessed over existing WADO-RS retrieves
• Defined file extensions for contents
• Added File Meta Information to XML/JSON

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Exclusions

• Other archive formats not defined
• Inclusion of data other than DICOM metadata and

Bulkdata

• Encryption of archive (except transport encryption)
• Layout of ZIP, other than linkage between Bulkdata

URI and Bulkdata file

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Example Study Retrieve

URL is just like multipart/related retrieve: http://localhost/wado/studies/1.2.3/instances?accept=applic ation/zip;type=“application/dicom+xml” The study structure might be: Studies/series0/image0.xml Containing a Bulkdata URI reference “image0- Bulkdata/00100020.raw” Studies/series0/image0-Bulkdata/00100020.raw Studies/… (rest of study)

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Example Study Metadata Retrieve

URL is just like multipart/related retrieve: http://localhost/wado/studies/1.2.3/metadata?accept=applic ation/zip;type=“application/dicom+xml” The study structure might be: 1.2.3/3.4.5/6.7.xml Containing a Bulkdata HTTP URI “http://localhost/wado/studies/1.2.3/series/3.4.5/Bulkdata/6. 7/00100020.raw” The ZIP file will NOT contain any Bulkdata files 1.2.3/… (rest of study)

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Conclusions

• The ZIP Payload retrieve will allow more users and

systems to easily access the DICOMweb services

• Meets the goals of the web services providing extended,

easy access to data

• Standardizes what is already done in many

implementations of DICOMweb

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