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Improve DICOM Network Transfer Times

Improve DICOM Network Transfer Times. Henri Matthijssen Philips Healthcare – MRI Group Sr. Domain Expert Interoperability Best, The Netherlands DICOM WG-16. Improve DICOM Network Transfer Times. - Introduction - How does DICOM Network Transfer work - Possible solutions

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Improve DICOM Network Transfer Times

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  1. Improve DICOM Network Transfer Times Henri Matthijssen Philips Healthcare – MRI Group Sr. Domain Expert InteroperabilityBest, The Netherlands DICOM WG-16

  2. Improve DICOM Network Transfer Times • - Introduction • - How does DICOM Network Transfer work • - Possible solutions • Enhanced Family of IODs • A-Synchronous DICOM Transfer • - Performance Measurements • - Summary • - Conclusions March 2013 DICOM International Conference & Seminar Improve DICOM Network Transfer Times

  3. Introduction • Trend: • Faster Hardware • More Storage • Increased Network Bandwidth • Result / Observation: • Number of Images / Exam is growing. • However you see that transfer speed is not improving • You will even see that acquiring the data is faster then transferring the data. March 2013 DICOM International Conference & Seminar Improve DICOM Network Transfer Times

  4. How does DICOM Network Transfer work? • What's the problem? • Not the network because you will typically see that it's hardly used. • Further inspection learns that the synchronous DICOM handshaking is causing the delay: • C-STORE-RQ A => • <= C-STORE-RSP A • C-STORE-RQ B => • <= C-STORE-RSP B • C-STORE-RQ C => • <= C-STORE-RSP C • This is done for every DICOM object you transfer. • With default synchronous DICOM transfer you can only send the next object when you received back the answer of the previous object. March 2013 DICOM International Conference & Seminar Improve DICOM Network Transfer Times

  5. Possible Solutions • Find a way to reduce the waiting for each other. • How? • 1. Send less objects • 2. Use a-synchronous DICOM transfer March 2013 DICOM International Conference & Seminar Improve DICOM Network Transfer Times

  6. Fixed Header Pixel data (not to scale) Dimension data Per-frame header Use of Enhanced Family of IODs N Objects, N Headers • The new DICOM Enhanced Family of objects gives you the multi-frame principle. Instead of n objects for a Series with repeating Patient/Study/Series information you have 1 object containing all information of that Series. • This way you only have the C-STORE-RQ / C-STORE-RSP one time instead of n times. N Frames, One Header March 2013 DICOM International Conference & Seminar Improve DICOM Network Transfer Times

  7. Performance Figures with Enhanced Family of IODs • We typically see an improvement on the usage of network to the extend that the hard disk speed is then the bottleneck. March 2013 DICOM International Conference & Seminar Improve DICOM Network Transfer Times

  8. Use of A-Synchronous DICOM Transfer • Here you may continue to invoke further operations or notifications to the performing DICOM AE without awaiting a response. • C-STORE-RQ A => • C-STORE-RQ B => • <= C-STORE-RSP A • C-STORE-RQ C => • <= C-STORE-RSP B • <= C-STORE-RSP C • Optional in the DICOM association • If supported then maximum number of outstanding operations or notifications is negotiated during DICOM Association establishment. March 2013 DICOM International Conference & Seminar Improve DICOM Network Transfer Times

  9. Performance Figures A-Synchronous Transfer • For your transfer improvement, there is turning point for the number of parallel DICOM operations or notifications you support. March 2013 DICOM International Conference & Seminar Improve DICOM Network Transfer Times

  10. Summary (1/2) • DICOM provides currently 2 ways to improve DICOM Network transfer times: • 1. Using Enhanced Family of objects • Advantage: • Better Interoperability • Faster Transfer times • Disadvantage: • Not wide-spread yet (chicken/egg problem) • More effort expected to implement for senders/receivers March 2013 DICOM International Conference & Seminar Improve DICOM Network Transfer Times

  11. Summary (2/2) • 2. Using a-synchronous DICOM transfer • Advantage: • Possible with the Classic Family of Objects • Faster Transfer times • Easy to implement for senders/receivers • Disadvantage • Not wide-spread yet (optional feature of DICOM association) • One of the best kept secrets of DICOM (thus this presentation) March 2013 DICOM International Conference & Seminar Improve DICOM Network Transfer Times

  12. Conclusion • DICOM provides currently 2 ways to improve DICOM Network transfer times significantly: • Enhanced Family of objects, fit for the future but problematic for Installed base • A-synchronous Transfer can speed up Classic (and Enhanced) Network Transfers considerably, but is not widely used yet March 2013 DICOM International Conference & Seminar Improve DICOM Network Transfer Times

  13. References http://dicom.nema.org/ March 2013 DICOM International Conference & Seminar Improve DICOM Network Transfer Times

  14. Author Contacts • Henri Matthijssen Henri.Matthijssen@philips.com Thank you for your attention ! March 2013 DICOM International Conference & Seminar Improve DICOM Network Transfer Times

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