CPR Curved Planar Reformation A Kanitsar 1 D

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

Vessel Investigation using CTA ~ 1500 slices vessels are not visible entirely within just one slice Visualization is essential! Armin Kanitsar 2 Vienna University of Technology

Significance of Visualization (1) vessel lumen in MIP not visible! MIP Armin Kanitsar DSA 3 Vienna University of Technology

CPR Basics n Resample an image visualizing a vessel in its entirety. Dataset Points Tracking Path CPR Armin Kanitsar 4 Vienna University of Technology

Significance of Visualization (2) MIP Armin Kanitsar DSA 5 CPR Vienna University of Technology

Projected CPRPlane? How To Display The n Provide good overview n Allow fast inspection n Easy to handle Armin Kanitsar 6 Vienna University of Technology

Projected CPR n Resample each generating line from data set n Project to corresponding position of the image n Compositing using MIP/AVG/Min. IP - Isometry not maintained + Spatial perception very good - Occlusions possible - Geometric artifacts Armin Kanitsar 7 Vienna University of Technology

Stretched CPR n Resample each generating line from data set n Unroll plane in image n Height of the image depends on: u Vessel length u Curvature of the vessel in image - Sensitive to high + Length-preserving + No occlusions possible + Reduced geometric curvature within vessel artifacts Armin Kanitsar 8 Vienna University of Technology

Straightened CPR n Resample each generating line from cross-section n Height of the image depends on: u Vessel length - No spatial relationship - Rotating frame Armin Kanitsar + Length-preserving + No occlusions possible 9 Vienna University of Technology

Method Comparison Armin Kanitsar 10 Vienna University of Technology

Methods Comparison Projected Stretched Straightened Perception high medium low Isometry no yes Occlusions possibly no no Armin Kanitsar 11 Vienna University of Technology

CPR Limitations n Pseudo stenosis due to inaccurate centerline detection n Longitudinal sections do not cover the whole vessel calcification vessel lumen n One vessel per image results in large number of images to investigate Armin Kanitsar 12 Vienna University of Technology

Thick CPR n Compositing: MIP/AVG/Min. IP ~3 mm Armin Kanitsar 13 Vienna University of Technology

calcification Rotating CPR vessel-lumen PR Armin Kanitsar 14 ST SA Vienna University of Technology

Multi-Path CPR (1/3) Medial Axis Reformation (He 01) right AT Artery Armin Kanitsar F Artery PT Artery 6 Paths 15 PT Artery left F AT Artery Vienna University of Technology

Multi-Path CPR (2/3) Armin Kanitsar 16 Vienna University of Technology

Armin Kanitsar Stretched – Multi-Path CPR Projected – Multi-Path CPR (3/3) 17 Vienna University of Technology

Thank You For Your Attention! Armin Kanitsar 18 Vienna University of Technology