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CPR Curved Planar Reformation

2 Department of Radiology University of Vienna. 1 Institute of Computer Graphics and Algorithms Vienna University of Technology. 3 VRVis Research Center Vienna,Austria. CPR Curved Planar Reformation. A. Kanitsar 1 , D. Fleischmann 2 , R. Wegenkittl 3 , P. Felkel 3 , M. E. Gröller 1.

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CPR Curved Planar Reformation

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  1. 2Department of RadiologyUniversity of Vienna 1Institute of Computer Graphics and AlgorithmsVienna University of Technology 3VRVis Research CenterVienna,Austria CPRCurved Planar Reformation A. Kanitsar1, D. Fleischmann2, R. Wegenkittl3, P. Felkel3, M. E. Gröller1

  2. vessels are not visible entirely within just one slice ~ 1500 slices Vessel Investigation using CTA Visualization is essential!

  3. Significance of Visualization (1) vessel lumen in MIP not visible! MIP DSA

  4. Dataset Points Tracking Path CPR Basics • Resample an image visualizing a vessel in its entirety. CPR

  5. Significance of Visualization (2) MIP DSA CPR

  6. Projected CPR How To Display The Plane? • Provide good overview • Allow fast inspection • Easy to handle

  7. Projected CPR • Resample each generating line from data set • Project to corresponding position of the image • Compositing using MIP/AVG/MinIP • Isometry not maintained • Occlusions possible • Geometric artifacts • Spatial perception very good

  8. Stretched CPR • Resample each generating line from data set • Unroll plane in image • Height of the image depends on: • Vessel length • Curvature of the vessel in image • Sensitive to high curvature within vessel • Length-preserving • No occlusions possible • Reduced geometric artifacts

  9. Straightened CPR • Resample each generating line from cross-section • Height of the image depends on: • Vessel length • No spatial relationship • Rotating frame • Length-preserving • No occlusions possible

  10. Method Comparison

  11. Methods Comparison

  12. CPR Limitations • Pseudo stenosis due to inaccurate centerline detection calcification • Longitudinal sections do not cover the whole vessel vessel lumen • One vessel per image results in large number of images to investigate

  13. Thick CPR • Compositing: MIP/AVG/MinIP ~3mm

  14. calcification vessel-lumen PR ST SA Rotating CPR

  15. Multi-Path CPR (1/3) Medial Axis Reformation (He01) right AT Artery F Artery PT Artery PT Artery F Artery left AT Artery 6 Paths

  16. Multi-Path CPR (2/3)

  17. Multi-Path CPR (3/3) Projected – Multi-Path CPR Stretched – Multi-Path CPR

  18. Thank You For Your Attention!

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