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12 Cards in this Set
- Front
- Back
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What is the process of modelling an organ? |
- Segmentation of organ surface - Organ shapes (N) given by triangle vertices - Correspondences between features |
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What are the two possible pathologies in the uterus? |
Polyps and myomas protruding into uterine cavity. |
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How does the "game of life" model work? |
An infinite two-dimensional orthogonal grid of cells has two possible cell stated (alive or dead). Cells interact with eight neighbors in the following manner: 1. Dead cell with 3 Alive neighbors becomes alive 2. Alive cell with 2 or 3 Alive neighbors survives 3. All other Alive cells die |
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What are the two model requirements for the generation of vascular structures? |
- virtual vessel system with high graphical fidelity - Growth based on vasculo- and angiogenesis |
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What are the two modelling approaches for the generation of vascular structures? |
- geometrical: L-system growth, flow and pressure data - Quasi-physiological: Metabolic tissue activity, Oxygen deficiency maps |
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How do Lindenmayer systems work? |
F = draw line in current direction + = rotate counterclockwise alpha degrees - = rotate clockwise alpha degrees |
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What is the strategy of organ texturing? |
Using an in-vivo image the texture is synthesized and applied on a polyp mesh. |
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What are the two texture generation approaches? |
- direct computation: procedural models - synthesis: Pixel-based, patch-based |
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What is patch based synthesis? |
It is when small shots from a texture are combined to form a larger homogenous structure. The neighbouring squares are homogenized using the minimal boundary cut |
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How is the minimum error boundary cut computed? |
Dynamic programming - sum of squared difference in overlap region - starting from top row, the minimal cumulative error is computed - Find minimal error on bottom row, determine path by connecting minimal values. |
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What are the main soft tissue characteristics? |
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What are the two texture generation approaches? |
- synthetic: iterative manual tuning by experts - real world based: ex-vivo testing, in-vivo experiments |
