1 / 41

An Interactive Virtual Endoscopy Tool With Automated Path Generation

An Interactive Virtual Endoscopy Tool With Automated Path Generation. Delphine Nain, MIT AI Laboratory. Thesis Advisor : W. Eric. L Grimson, MIT AI Laboratory. Presentation Overview. Background and Motivation Interactive System Central Path Planning Algorithm

loc
Télécharger la présentation

An Interactive Virtual Endoscopy Tool With Automated Path Generation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. An Interactive Virtual Endoscopy Tool With Automated Path Generation Delphine Nain, MIT AI Laboratory. Thesis Advisor: W. Eric. L Grimson, MIT AI Laboratory.

  2. Presentation Overview • Background and Motivation • Interactive System • Central Path Planning Algorithm • Synchronized Virtual Endoscopy • Conclusion

  3. Medical Motivation • Cancer is the 2nd cause of death in the US • 43 % of people have a risk to be diagnosed with cancer • Out of those 88 % are cancer in inner organ • How can “see” inside the body to screen and cure?

  4. Conventional Endoscopy • advantages: • minimally invasive • high resolution • interactivity • disadvantages: • can be painful and uncomfortable • limited exploration

  5. Conventional Medical Imaging

  6. Conventional Visualization • advantages: • non invasive • information on tissue shape through and beyond walls of organ • disadvantages: • mentally align contiguous slides • lower resolution than video

  7. Segmentation: Volume

  8. 3D Reconstruction : Model

  9. 3D Visualization

  10. Virtual Endoscopy • Combines strengths of previous alternatives on patient-specific dataset • Spatial exploration • Cross-correlation with original volume Compact and Intuitive way to explore huge amount of information

  11. Virtual Endoscopy: advantages • clinical studies: • planning and post-operation: generates views that are not observable in actual endoscopic examinations • color coding algorithms give supplemental information

  12. Virtual Colonoscopy

  13. System Requirements • Combination of Interactivity and Automation is key • Cross Reference between 3D models and grayscale volumes

  14. Presentation Overview • Background and Motivation • Interactive System • Central Path Planning Algorithm • Synchronized Virtual Endoscopy • Conclusion

  15. Display

  16. Navigation Interface

  17. Cross Reference Provided by Arjan Welmers

  18. Path: Update

  19. Applications: Middle Ear ThomasRodt Soenke Bartling

  20. Applications: Cardiovascular Provided by Bonglin Chung

  21. Presentation Overview • Background and Motivation • Interactive System • Central Path Planning Algorithm • Synchronized Virtual Endoscopy • Conclusion

  22. Automated Path Planning • Goal: provide a “create path” button that produces a centerline inside a 3D model of any topology

  23. Input

  24. Output

  25. Step 1: Produce a Labelmap

  26. Step 2: Produce a distance map

  27. Step 3: Create a Graph Create a Graph description of the Distance Map • Nodes are voxels inside the model • Edge weight are 1/(distance)2 from the wall of the organ

  28. Step 4: Run modified Dijkstra Dijkstra algorithm is a single source shortest path algorithm • We use a binary heap • An optimization: keep an evolving front, stop when reach the end node

  29. Step 5: Results Running Time: ~7s

  30. Step 5: Results Running Time: ~3s

  31. Presentation Overview • Background and Motivation • Interactive System • Central Path Planning Algorithm • Synchronized Virtual Endoscopy • Conclusion

  32. Synchronized Virtual Colonoscopy

  33. Dynamic Programming

  34. Results

  35. Conclusion • Combination of Automation and Interactivity is key • Cross Reference is important • Synchronized Fly-Throughs is novel contribution Publication: D. Nain, S. Haker, E. Grimson, R. Kikinis “An Interactive Virtual Endoscopy Tool”, IMIVA workshop, MICCAI 2001.

  36. Acknowledgements • Ron Kikinis • Steve Haker • Lauren O’Donnell • David Gering • Carl-Fredrik Westin • Peter Everett • Sandy Wells • Eric Cosman • Polina Golland • Soenke Bartling • John Fisher • Mike Halle • Ferenc Jolesz

  37. Thank You! Steve Haker, Hoon Ji, Connie Sehnert

  38. Correspondance VC = T is transformation matrix (translation or rotation along local axis) To uniquely determine the coordinates of the virtual camera: • coordinates of camera: • VCnew = VCold* T • coordinates of the focal point: • FPnew = VCnew* T

  39. Cross Reference Provided by Arjan Welmers

  40. 3D Visualization

  41. Synchronized Virtual Endoscopy

More Related