A sketch based interface for modeling myocardial fiber orientation
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A Sketch-based Interface for Modeling Myocardial Fiber Orientation. Kenshi Takayama 1 Takeo Igarashi 1,2 Ryo Haraguchi 3 Kazuo Nakazawa 3 1 The University of Tokyo 2 JST SORST 3 National Cardiovascular Center Research Institute. Introduction Background

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A sketch based interface for modeling myocardial fiber orientation

A Sketch-based Interface for Modeling Myocardial Fiber Orientation

Kenshi Takayama1 Takeo Igarashi1,2

Ryo Haraguchi3 Kazuo Nakazawa3

1The University of Tokyo

2JST SORST

3National Cardiovascular Center

Research Institute


Introduction Orientation

Background

Related work

Basic idea

User Interface

Algorithm

User Experience

Conclusion


Background
Background Orientation

  • 50,000 die from cardiac sudden death

  • Abnormal heart rhythm is its major cause

  • Its mechanism is not clear


Simulation approach

Elucidation Orientation

Prediction

Education

Simulation approach

Mathematical model


3 stages of process

Bottleneck Orientation

Modeling

Simulation

Evaluation

3 stages of process


Various parameters
Various parameters Orientation

Purkinje fiber network

Geometry

Our target

Myocardial fiber orientation


Previous method
Previous method Orientation

  • Take 2D slices from xyz direction

  • Specify vectors one-by-one

  • Very tedious


Related work
Related work Orientation

  • Vector field design on surfaces

[Praunet al,00]

[Zhang et al,06]

[Turk,01]

[Fisher et al,07]


Our contribution
Our contribution Orientation

  • Previous work :

    Only vector field on surface

  • Ours :

    Design of volumetricvector field


Basic idea
Basic idea Orientation

  • Observation

    • “Myocardial fibers are parallel to the surface of the heart”

  • Two-step algorithm

    Step 1: Construct tangent vector field

    Step 2: Construct volumetric vector field


Introduction Orientation

User Interface

Stroke on the surface

Stroke crossing the model

Stroke on the cross-section

Algorithm

User Experience

Conclusion


Stroke on the surface
Stroke on the surface Orientation

  • Specify fiber orientations on the surface


Stroke crossing the model
Stroke crossing the model Orientation

  • Cutting

  • Create cross-sectional surface


Stroke on the cross section
Stroke on the cross-section Orientation

  • Specify fiber orientations inside the model


Demo Orientation


Introduction Orientation

User Interface

Algorithm

Tangent vector field

Volumetric vector field

Laplacian interpolation

User Experience

Conclusion


Tangent vector field
Tangent vector field Orientation

Sketch

Laplacianinterpolation

Tangent vector field


Volumetric vector field
Volumetric vector field Orientation

  • Sketch

  • Tangent vector field

Laplacianinterpolation

Volumetric vector field


Laplacian interpolation
Laplacian interpolation Orientation

  • Minimize Laplacian

  • Satisfy constraint

neighbor

Laplacian

neighbor

xi


Laplacian interpolation1
Laplacian interpolation Orientation

  • Matrix form

L

C


Laplacian interpolation2
Laplacian interpolation Orientation

  • Matrix form

  • Least-square solution


Laplacian interpolation3
Laplacian interpolation Orientation

  • Sparse linear system

Precomputable


Introduction Orientation

User Interface

Algorithm

User Experience

Preliminary test

Interview

Conclusion


Preliminary test
Preliminary test Orientation

  • Asked a physician* to try our system

  • Sample model by him

    • In about 8 minutes

  • Sample simulation result

* T. Ashihara, MD, PhD, Shiga University of Medical Science


Interview
Interview Orientation

  • Positive comments

    • “We need this tool!”

    • “Interface is intuitive and quick.”

    • “This can be a breakthrough.”


Interview1
Interview Orientation

  • Points to be improved

    • “Use of MRI may be needed.”

    • “Cross-sectioning is not suitable for visualizing fiber orientation.”


Introduction Orientation

User Interface

Algorithm

User Experience

Conclusion


Conclusion
Conclusion Orientation

  • Novel method for modeling myocardial fiber orientation

  • 2-step scheme (our contribution)

    • Surface  Volume

  • Preliminary user studywith a physician


Future work
Future work Orientation

  • Test other interpolation algorithms

  • More formal user test

  • Use of MRI

  • Peeling UI

  • Other applications

    • Fibers in wood

    • Particle animation

[Owadaet al,04]

Thank you.


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