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

slide2
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: Construct volumetric vector field

slide11
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
slide16
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 interpolation2
Laplacian interpolation
  • Matrix form
  • Least-square solution
laplacian interpolation3
Laplacian interpolation
  • Sparse linear system

Precomputable

slide23
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.”
slide27
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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