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

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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


A sketch based interface for modeling myocardial fiber orientation

Introduction

Background

Related work

Basic idea

User Interface

Algorithm

User Experience

Conclusion


Background

Background

  • 50,000 die from cardiac sudden death

  • Abnormal heart rhythm is its major cause

  • Its mechanism is not clear


Simulation approach

Elucidation

Prediction

Education

Simulation approach

Mathematical model


3 stages of process

Bottleneck

Modeling

Simulation

Evaluation

3 stages of process


Various parameters

Various parameters

Purkinje fiber network

Geometry

Our target

Myocardial fiber orientation


Previous method

Previous method

  • Take 2D slices from xyz direction

  • Specify vectors one-by-one

  • Very tedious


Related work

Related work

  • Vector field design on surfaces

[Praunet al,00]

[Zhang et al,06]

[Turk,01]

[Fisher et al,07]


Our contribution

Our contribution

  • Previous work :

    Only vector field on surface

  • Ours :

    Design of volumetricvector field


Basic idea

Basic idea

  • Observation

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

  • Two-step algorithm

    Step 1:Construct tangent vector field

    Step 2:Constructvolumetric vector field


A sketch based interface for modeling myocardial fiber orientation

Introduction

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

  • Specify fiber orientations on the surface


Stroke crossing the model

Stroke crossing the model

  • Cutting

  • Create cross-sectional surface


Stroke on the cross section

Stroke on the cross-section

  • Specify fiber orientations inside the model


A sketch based interface for modeling myocardial fiber orientation

Demo


A sketch based interface for modeling myocardial fiber orientation

Introduction

User Interface

Algorithm

Tangent vector field

Volumetric vector field

Laplacian interpolation

User Experience

Conclusion


Tangent vector field

Tangent vector field

Sketch

Laplacianinterpolation

Tangent vector field


Volumetric vector field

Volumetric vector field

  • Sketch

  • Tangent vector field

Laplacianinterpolation

Volumetric vector field


Laplacian interpolation

Laplacian interpolation

  • Minimize Laplacian

  • Satisfy constraint

neighbor

Laplacian

neighbor

xi


Laplacian interpolation1

Laplacian interpolation

  • Matrix form

L

C


Laplacian interpolation2

Laplacian interpolation

  • Matrix form

  • Least-square solution


Laplacian interpolation3

Laplacian interpolation

  • Sparse linear system

Precomputable


A sketch based interface for modeling myocardial fiber orientation

Introduction

User Interface

Algorithm

User Experience

Preliminary test

Interview

Conclusion


Preliminary test

Preliminary test

  • 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

  • Positive comments

    • “We need this tool!”

    • “Interface is intuitive and quick.”

    • “This can be a breakthrough.”


Interview1

Interview

  • Points to be improved

    • “Use of MRI may be needed.”

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


A sketch based interface for modeling myocardial fiber orientation

Introduction

User Interface

Algorithm

User Experience

Conclusion


Conclusion

Conclusion

  • Novel method for modeling myocardial fiber orientation

  • 2-step scheme (our contribution)

    • Surface  Volume

  • Preliminary user studywith a physician


Future work

Future work

  • 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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