CPR Curved Planar Reformation A. Kanitsar 1, D. Fleischmann 2, R. Wegenkittl 3, P. Felkel 3, M. E....
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CPR CPR Curved Planar Curved Planar Reformation Reformation A. Kanitsar A. Kanitsar 1 1 , D. Fleischmann , D. Fleischmann 2 2 , R. , R. Wegenkittl Wegenkittl 3 3 , P. Felkel , P. Felkel 3 3 , M. E. , M. E. Gröller Gröller 1 1 Institute of Computer Graphics and Institute of Computer Graphics and Algorithms Algorithms Vienna University of Technology Vienna University of Technology 2 Department of Department of Radiology Radiology University of University of Vienna Vienna 3 VRVis Research VRVis Research Center Center Vienna,Austria Vienna,Austria
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Transcript of CPR Curved Planar Reformation A. Kanitsar 1, D. Fleischmann 2, R. Wegenkittl 3, P. Felkel 3, M. E....
CPRCPRCurved Planar ReformationCurved Planar Reformation
A. KanitsarA. Kanitsar11, D. Fleischmann, D. Fleischmann22, R. Wegenkittl, R. Wegenkittl33, P. , P. FelkelFelkel33, M. E. Gröller, M. E. Gröller11
11Institute of Computer Graphics and Institute of Computer Graphics and AlgorithmsAlgorithms
Vienna University of TechnologyVienna University of Technology
22Department of RadiologyDepartment of RadiologyUniversity of ViennaUniversity of Vienna
33VRVis Research CenterVRVis Research CenterVienna,AustriaVienna,Austria
2 / 18Armin Kanitsar Vienna University of Technology
Vessel Investigation using CTAVessel Investigation using CTA
~ 1
500
slic
es~
150
0 sl
ices
vessels are not visible vessels are not visible entirely within just one sliceentirely within just one slice
Visualization is essential!Visualization is essential!
3 / 18Armin Kanitsar Vienna University of Technology
Significance of Visualization (1)Significance of Visualization (1)
vessel lumen vessel lumen in MIPin MIPnot visible!not visible!
MIPMIP DSADSA
4 / 18Armin Kanitsar Vienna University of Technology
CPR BasicsCPR Basics Resample an image visualizing Resample an image visualizing
a vessel in its entirety.a vessel in its entirety.
CPRCPR
DatasetDataset
PointsPoints
TrackingTracking
PathPath
5 / 18Armin Kanitsar Vienna University of Technology
Significance of Visualization (2)Significance of Visualization (2)
MIPMIP CPRCPRDSADSA
6 / 18Armin Kanitsar Vienna University of Technology
How To Display The Plane?How To Display The Plane?
Provide good overviewProvide good overview Allow fast inspectionAllow fast inspection Easy to handleEasy to handle
Projected CPRProjected CPR
7 / 18Armin Kanitsar Vienna University of Technology
Projected CPRProjected CPR Resample each generating line Resample each generating line
from data setfrom data set Project to corresponding Project to corresponding
position of the imageposition of the image Compositing using Compositing using
MIP/AVG/MinIPMIP/AVG/MinIP
- Isometry not maintainedIsometry not maintained
- Occlusions possibleOcclusions possible
- Geometric artifactsGeometric artifacts
+ Spatial perception very Spatial perception very goodgood
8 / 18Armin Kanitsar Vienna University of Technology
Stretched CPRStretched CPR
- Sensitive to high Sensitive to high curvature within vesselcurvature within vessel
+ Length-preservingLength-preserving
+ No occlusions possibleNo occlusions possible
+ Reduced geometric Reduced geometric artifactsartifacts
Resample each generating line Resample each generating line from data setfrom data set
Unroll plane in imageUnroll plane in image Height of the image depends on:Height of the image depends on:
Vessel lengthVessel length Curvature of the vessel in imageCurvature of the vessel in image
9 / 18Armin Kanitsar Vienna University of Technology
Straightened CPRStraightened CPR
- No spatial relationshipNo spatial relationship
- Rotating frameRotating frame+ Length-preservingLength-preserving
+ No occlusions possibleNo occlusions possible
Resample each generating line Resample each generating line from cross-sectionfrom cross-section
Height of the image depends on:Height of the image depends on: Vessel lengthVessel length
10 / 18Armin Kanitsar Vienna University of Technology
Method ComparisonMethod Comparison
11 / 18Armin Kanitsar Vienna University of Technology
Methods ComparisonMethods Comparison
ProjectedProjected StretchedStretched StraightenedStraightened
PerceptionPerception highhigh mediummedium lowlow
IsometryIsometry nono yesyes yesyes
OcclusionsOcclusions possiblypossibly nono nono
12 / 18Armin Kanitsar Vienna University of Technology
CPR LimitationsCPR Limitations
vessel lumenvessel lumen
calcificaticalcificationon
Pseudo stenosis due to Pseudo stenosis due to inaccurate centerline inaccurate centerline detectiondetection
Longitudinal sections do Longitudinal sections do not cover the whole vesselnot cover the whole vessel
One vessel per image One vessel per image results in large number of results in large number of images to investigateimages to investigate
13 / 18Armin Kanitsar Vienna University of Technology
Thick CPRThick CPR
Compositing: MIP/AVG/MinIPCompositing: MIP/AVG/MinIP
~3mm~3mm
14 / 18Armin Kanitsar Vienna University of Technology
Rotating CPRRotating CPRvessel-lumen
calcification
PRPR STST SASA
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Multi-Path CPR (1/3)Multi-Path CPR (1/3)
6 Paths6 Paths
F F ArteryArtery
PTPTArteryArtery
PTPTArteryArtery
FFArteryArtery
rightrightATAT
ArteryArtery
leftleftATAT
ArteryArtery
Medial Axis Reformation (He01)Medial Axis Reformation (He01)
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Multi-Path CPR (2/3)Multi-Path CPR (2/3)
17 / 18Armin Kanitsar Vienna University of Technology
Multi-Path CPR (3/3)Multi-Path CPR (3/3)
Pro
ject
ed –
Mul
ti-P
ath
CP
RP
roje
cted
– M
ulti-
Pat
h C
PR
Str
etch
ed –
Mul
ti-P
ath
CP
RS
tret
ched
– M
ulti-
Pat
h C
PR
18 / 18Armin Kanitsar Vienna University of Technology
Thank You For Your Attention!Thank You For Your Attention!
