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Viewing Medical Images on a PDA

Viewing Medical Images on a PDA. NSF REU “Computer Applications to Medicine” University of Virginia, Summer 2006 Andrew Jurik, Vanderbilt University. Contents. Motivation Goals Current State of the Art System Diagram Requirements Demonstration Evaluation Conclusion Future Work

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Viewing Medical Images on a PDA

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  1. Viewing Medical Images on a PDA NSF REU “Computer Applications to Medicine” University of Virginia, Summer 2006 Andrew Jurik, Vanderbilt University

  2. Contents • Motivation • Goals • Current State of the Art • System Diagram • Requirements • Demonstration • Evaluation • Conclusion • Future Work • Acknowledgements

  3. Motivation • PDAs are very portable • Quick access to images • Increase convenience for radiologists

  4. Goals • Create a working system that implements secure image transmission from a server to PDA, allowing radiologists review those images • To learn • C# • Web Services • Databases • Security • Image Manipulation

  5. Current State of the Art - Standards • HIPAA – Health Insurance Portability and Accountability Act • Sufficient security measures, rules about who can view medical information • PACS – Picture Archiving and Communications System • Acquires, transmits, stores, retrieves, and displays digital images • DICOM – Digital Imaging and COmmunication in Medicine • File format developed to define connectivity and communication protocols of medical imaging devices

  6. Current State of the Art - Imaging • CT scans are 512 x 512 pixels with 256 gray levels (24-bit color) • MR images are 256 x 256 pixels with 256 gray levels (24-bit color) • A Pocket PC has240 x 320-pixel screens,16-bit color (65536 colordepth, no more than 64gray levels)

  7. Current State of the Art[1] • Viewing on PDAs ~8 minutes on average • Head scans • PDAs: ~5 mins • PACS workstation: ~2.3 mins • Chest scans • PDAs: ~10 mins • PACS workstation: ~5 minutes • Interpretations were generally consistent on both machines with a few exceptions in which the PACS was able to pick up more [1] Merlina Trevino, “Radiologists examine images in the palms of their hands”, http://www.diagnosticimaging.com/pacsweb/newsupdate/showArticle.jhtml?articleID=59300898

  8. Basic System Diagram Web Services Web Server & Database PDA (client-side application) Caveat: This program should be used for preliminary viewing of medical images only. The PDA hardware is not at a point yet to permit a comprehensive diagnosis.

  9. Requirements • Usability • Simple, easy-to-understand GUI • Security / Auditing • Password authentication • Log access attempts • Secure transmissions (an efficient solution to saving securely could not be attained within the time frame) • Annotation • Allow radiologist to annotate image in various ways

  10. Demonstration

  11. Evaluation • The program is fully functional • Freehand annotation, panning, resizing, contrast/brightness control, invert colors, image text data, save annotation text, save image in three file formats • Limitations that prevent HIPAA compliance and practical commercialization at this point: • Not DICOM-compliant • Using mySQL server to store images, not PACS server • Save operation is not encrypted, encryption for everything else uses only server authentication (client authentication would make access more secure)

  12. Conclusions • Although this program will not be used by radiologists anytime soon, the fundamental idea behind the use of a PDA to view medical images is solid. • Future work and development of both hardware and software will allow diagnostic compatibility at some point in the (probably near) future

  13. Future Work • Overcoming aforementioned limitations • Add biometric authentication • E-mail support to send to referring physician or other radiologist • Allow user to record voice and save along with image • Implement video support for moving images

  14. Viewing Medical Images on a PDA NSF REU “Computer Applications to Medicine” University of Virginia, Summer 2006 Andrew Jurik, Vanderbilt University

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