The VesselGlyph: Focus & Context Visualization in CT-Angiography
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1 The VesselGlyph: Focus & Context Visualization in CT-Angiography Matúš Straka M. Šrámek, A. La Cruz E. Gröller, D. Fleischmann
2 Contents Motivation:» Why again a new visualization method for vessel data? Concept of the VesselGlyph Patient data examples Algorithm Conclusion 2/28
3 Vessel Visualization Basics Visualization of vessels (angiography)» Diseased vessels, e.g. PAOD» Depiction of soft plaque, calcifications, occlusions, Datasets acquired using helical CT scanner Vessels enhanced in CT-Angiography images by injection of contrast agent CT-Angiography data are huge (1200+ slices) 3/28
4 4/28
5 Vessel Visualization Basics Visualization of diseased vessels (PAOD) CT-Angiography data are huge (1200+ slices) Tissue density ranges can overlap, tissues can be spatially very close» Problematic segmentation» Only centerlines of the main vessels often available Aorta (vessel) Vertebra (bone) Vessels represent a small part of the dataset The rest is important as an anatomic context 5/28
6 The AngioVis Project Interdisciplinary project aimed at visualization and assessment of vessels in 3D CT-Angiography datasets» Development of new methods and SW tools Cooperation of:» Austrian Academy of Sciences» Vienna University of Technology, Austria» General Hospital (AKH) of Vienna, Austria» Stanford Medical Centre, USA 6/28
7 Vessel Visualization Basics 7/28 Maximum Intensity Projection (MIP) Curved Planar Reformation (CPR) Direct Volume Rendering (DVR)
8 Why something new? Objects in focus (vessels) need to be enhanced in the images Anatomic context is important for orientation in the images» No relevant anatomic context in CPR images» Depth perception ambiguous in MIP images» Occlusion in MIP and DVR images Anatomic context should not dominate the images Different visualization techniques and/or parameters for focus and context are needed 8/28
9 The VesselGlyph Is a concept for:» Spatially dependent definition of focus and context areas» Combination of various visualization techniques and/or parameters therein» If necessary, allows also smooth transition in between Focus and context areas are defined by:» Vessel centerlines» Voxel-to-centerline distances and viewing vector 9/28
10 The VesselGlyph Concept Soft Tissue Vessel Focus Area Bone Dataset Slice View Direction Context Area 10/28
11 VesselGlyph Construction Dataset Slice Context Focus Context Transitional Areas 11/28
12 VesselGlyph Application For tubular structures, VesselGlyph» can be used as 2D-to-3D interface» Allows easy modification of parameters (size, layout, technique, ) in 2D widget» Swept along the centerline for 3D results 12/28
13 VesselGlyph Application Vessel 13/28
14 VesselGlyph Layouts Dataset Context Focus Context Transitional Areas 14/28
15 VesselGlyph Layouts Dataset Context Focus Context Transitional Areas 15/28
16 VesselGlyph Layouts Dataset Focus Context Transitional 16/28
17 VesselGlyph Layouts Dataset Context Focus Transitional Areas 17/28
18 Focus & Context Definition r r α d f f = f ( d, v) / c or r v r View Dir f f = f ( d, α) / c 18/28
19 Tubular VesselGlyph» Normal DVR for focus» Transparent DVR for context View Dir Motivation» Concept» Examples»Algorithm»Conclusion 19/28
20 20/28
21 Thick-Slab VesselGlyph View Dir» Normal DVR for focus» Transparent DVR for context 21/28
22 CPR-in-DVR VesselGlyph focus c View Dir» CPR for focus» DVR for context Motivation» Concept» Examples»Algorithm»Conclusion 22/28
23 Foreground-Cleft» DVR for focus» DVR for context View Dir Motivation» Concept» Examples»Algorithm»Conclusion 23/28
24 Foreground Cleft with Occlusion Lines View Dir» DVR for focus» DVR for context Rear view Front view Motivation» Concept» Examples»Algorithm»Conclusion 24/28
25 Algorithm Three-stage processing:» 1. Distance-to-centerline evaluation» 2. Focus and context partial rendering» 3. Compositing of partial renderings Compositing of partial renderings can be:» Implicit (F/C rendered at once)» Based on distance» Based on data density 25/28
26 Algorithm Extension of standard DVR algorithm Opacity depends also on spatial location Transparency modifier coefficient:» Influences opacity transfer function» Different for focus and context» Works for DVR+DVR layouts f f / c Special cases - DVR+CPR, DVR+MIP 26/28
27 Conclusion & Future Work VesselGlyph:» Is a generalization of various visualization techniques (DVR, CPR, MIP, )» Displays unoccluded objects in a correct anatomic context Clinical evaluation in progress Extension to arbitrary shapes using distance fields 27/28
28 Thank you for your attention 28/28
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