SimITK and SimVTK: ITK and VTK in Simulink - PowerPoint PPT Presentation
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SimITK and SimVTK: ITK and VTK in Simulink
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A LaPointe, G Fichtinger, P Abolmaesumi. Medical Image Analysis ... Simulink models can run as stand-alone exec. Nearly all VTK, ITK classes can be wrapped ... – PowerPoint PPT presentation
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Title: SimITK and SimVTK: ITK and VTK in Simulink
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SimITK and SimVTKITK and VTK in Simulink
- DG Gobbi, P Mousavi, KM Li, J Xiang, A
Campigotto, - A LaPointe, G Fichtinger, P Abolmaesumi
- Medical Image Analysis Laboratory (MedIA)
- http//www.media.queensu.ca
- School of Computing
- Queens University
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Motivation
- Visual programming for ITK and VTK
- Drag drop approach to application development
- Increase understandability maintainability
- Instructional value
- MATLAB is our friend
- Use MATLABs Simulink visual environment
- Hence, avoid reinventing the wheel
- Allow mix of MATLAB code and ITK / VTK
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Related Work
- Visual Programming of VTK and ITK
- ITKBoard (CSIRO)
- SciRun (Utah)
- MeVisLab (MeVis Research GmbH)
- caBIG XIP (caBIG, Siemens, Washington U. in St
Louis) - ITK and VTK in MATLAB (without Simulink)
- MATITK (Chu and Hamarneh)
- VTK plus MATLAB various
- Us Visual ITK/VTK Programming in MATLAB
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MATLABs Simulink Environment
Library
Model
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Our Own Simulink Libraries
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3D Processing with ITK
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Combine ITK Processing and VTK Rendering
Output VTK Window
Input cthead1.png
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Method Wrapping Process
- Simulink wrappers for ITK, VTK
- Each Simulink block is an S-Function with
callbacks - S-Function callbacks are C code, calls ITK or
VTK - CMake build process
- Start with an XML description of each filter
(ITK) - or Start with class header files (VTK)
- CMake calls perl script to generate C code
- CMake then calls perl to generate .mdl library
file - Finally, build libraries with VC or gcc
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Method Data Flow for SimITK
- SimITK, SimVTK use different architecture
- ITK is primarily image based
- VTK handles many data set types
- SimITK Data Flow
- ITK images -gt MATLAB arrays (info and data)
- Use shared memory for efficiency
- Conversion of ITK parameter data types
- ITK uses several specialized types e.g. versor
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SimITK Helper Class
Input
InputPort
Conversion
itkImage
Spacing Origin
Data
Conversion
Parameters
Run ITK Image Filter
Parameter Variables
Output
Conversion
OutputPort
Spacing Origin
itkImage
Data
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Method Data Flow for SimVTK
- SimVTK Data Flow
- Use MATLAB arrays to pass vtkObject pointers
- Define VTKOBJECT MATLAB type for safety
- When run starts, Simulink builds VTK pipeline
on-the-fly - Then, Simulink calls Update or Render at each
time step - SimVTK filter parameters
- VTK parameter types need no conversion
- VTK and MATLAB both use basic C data types
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Registration Examples
- Registration in ITK
- Immediate, interactive feedback
- Great way to tune parameters
- Easy to swap out components
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Intervention Examples
- Computer Assisted Intervention in VTK
- Incorporate real-time data input
- Use Subsystems to manage complexity
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Discussion
- Diagrams that actually run as code
- Easy to verify that code matches design
- Great teaching tool
- Understandability improves maintainability
- Utility
- Simulink models can run as stand-alone exec
- Nearly all VTK, ITK classes can be wrapped
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Future Work
- WrapITK
- To automate ITK build (VTK is already done!)
- GUI integration
- Slicer module interface in Simulink
- KWWidgets (later Qt, maybe FLTK)
- Community Building
- Mailing list, website
- We want to hear from you!
