surface - Visualization Methods 1 2 3 4 Contour Tracking...

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1 1 Visualization Methods 1. Contour Tracking 2. Surface Rendering 3. Direct Volume Rendering 4. Iso-surface Rendering 2 Visualization Methods polygons outline contouring Extract planes Point array Sample F(x,y,z) line Display Display Display Display mesh resampling DVR
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2 3 3D Model Surface MIP Min IP Ray Sum Integral Cut Plane Extract Surface Volume Inner View Color Mix Visualization Methods 4 MIP Min IP Ray Sum 3D Model Data Surface Ray Sum (Inner view) Visualization Methods
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3 5 Surface(Color/Mix) Color/Mix MIP Min IP 3D Model Data Surface Cut Plane Visualization Methods 6 Wireframe Contours Build a display list of isovalued lines Interactive methods Pro : interactive speed Con : minimal information in images 5 5 5 5 5 6 5 6 5 5 6 6 7 5 5 7 7 8 6 5 8 8 9 7 6
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4 7 Pseudo-color exposed extent and oblique planes Examples Multiplanar Reformation (MPR) 8 Multiplanar Reformation Interactive viewing Reconstruction planes Axial, coronal, sagital Oblique, double oblique Curved planar reformation Freehand drawing Special techniques Display on 3D image 3D MPR Freely moving MPR plane on the volume
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5 9 MPR Pros Real-time, rapid Entire information without loss of data Cons 2D image Lack of overall feature Tortuous, branching structures 10 MIP Maximum attenuation value is mapped to a 2D gray scale image Line of Sight
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6 11 MIP Entry point Exit point 12 MinIP
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7 13 MIP / MinIP 2D projection image Useful in blood vessels, calcifications, airways & air-filled gastrointestinal tract (high contrast with background) Necessary to remove overlapping structures Cine-loop to convey 3D structures 14 Surface Rendering (Geometry Rendering) Objects are defined in terms of surfaces Converts the data into an intermediate surface representation before the rendering volume data geometric primitives : surface reconstruction (surface fitting) Reconstruction Methods Contouring 2D based Marching cubes Dividing cubes
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8 15 Surface Rendering Pros Render in hardware Changing View/Light(s) requires only rendering Compact storage & transmission Render in object order or image order Good spatial coherence for efficient rendering 16 Surface Rendering Cons Requires Binary Classification Throws Away Data Between Surfaces False Positives and Negatives Handles Small Features Poorly Not easy to Handle Branching User Intervention Sometimes Required Amorphous Data Doesn't Have "Thin Surfaces" Modeling complexity several minutes to extract 500,000 triangles
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Contouring A contour is a line drawn on a plan joining all points of the same (OR above or below) intensity value. Extract contours at each section and connect them
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surface - Visualization Methods 1 2 3 4 Contour Tracking...

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