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Simulated vascular reconstruction in a virtual operating theatre

Simulated vascular reconstruction in a virtual operating theatre. Robert G. Belleman , Peter M.A. Sloot, Section Computational Science, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, the Netherlands. Email: robbel@science.uva.nl. Overview of this research.

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Simulated vascular reconstruction in a virtual operating theatre

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  1. Simulated vascular reconstructionin a virtual operating theatre Robert G. Belleman, Peter M.A. Sloot, Section Computational Science, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, the Netherlands. Email: robbel@science.uva.nl R.G. Belleman, SCS/UvA

  2. Overview of this research • Interactive virtual environments for the exploration of • Multi-dimensional datasets • Multi-parameter spaces (computational steering) • Visualization and interaction in Virtual Reality (VR) • Applied to a test case:simulated vascular reconstruction in VR R.G. Belleman, SCS/UvA

  3. Previous work: VRE • The Virtual Radiology Explorer(VRE): • Static exploration of 3D medical datasets • Virtual Reality (VR) interface • CAVE at SARA, Amsterdam • Portable ImmersaDesk • Surface/volume rendering • Virtual endoscopy • PACS data and computinginterface • Data storage and processingon parallel system (IBM SP2) R.G. Belleman, SCS/UvA

  4. The Virtual Laboratory • Shared use of distributed computing resources:high performance computers, scanners, algorithms, etc. • Connected via high performance networks • Common infrastructure: the Virtual Laboratory • Multi-disciplinary scientific experimentation • Problem solving environments (PSE) • Time/location independent scientific experimentation • Collaborative scientific research For additional information... DutchGrid initiative: http://vlabwww.nikhef.nl/ R.G. Belleman, SCS/UvA

  5. A test case: VRE+ • Simulated vascular reconstruction • Patient specific angiographydata • Fluid flow simulationsoftware • Simulation of reconstructivesurgical procedure in VR • Interactive visualization ofsimulation results in VR • Pre-operative planning • Explore multiple reconstructionprocedures R.G. Belleman, SCS/UvA

  6. Pre-operative planning R.G. Belleman, SCS/UvA

  7. Preprocessing • Segmentation of patient specific MRA/CTA scan • Isolates region of interest • Lattice Boltzmann grid generation • Defines solid and fluid nodes, inlet and outlet conditions R.G. Belleman, SCS/UvA

  8. Fluid flow simulation • Lattice Boltzmann Method (LBM) • Lattice based particle method • Regular lattice, similar to CT or MRI datasets • Spatial and temporal locality • Ideal for parallel computing • Allows irregular 3D geometry • Validated with experimentsand FE simulations • Non-compressiblehomogeneous fluid,laminar flow • Velocity, pressure and shearstress calculated fromparticle densities R.G. Belleman, SCS/UvA

  9. Interactive exploration in VR • Visualize simulation results • Flow field, pressure, shear stress • Real time • Interactive exploration • VR interaction to locateregions of interest • Interactive grid editing • Simulate vascularreconstruction procedure R.G. Belleman, SCS/UvA

  10. Interactive exploration in VR • Quantification in VR: GEOPROVEGeometric Probes for Virtual Environments R.G. Belleman, SCS/UvA

  11. Conclusions • Test case shows example of a Problem Solving Environment (PSE) • Shared use of distributed resources • Time/location independent collaborative experimentation • PSEs open new possibilities for collaborative scientific research • Grid initiatives (Globus) • Virtual Environments provide intuitive interface for the exploration of multi-dimensional datasets and parameter spaces R.G. Belleman, SCS/UvA

  12. Future work • Lattice Boltzmann fluid simulation: • Flexible walls • Grid refinement • Pulsatile flow • Multi-phase flow • Exploration in VR • Multi-modal interaction (speech recognition/synthesis, audio) • PC based (low-cost) VR R.G. Belleman, SCS/UvA

  13. Partners • University of Amsterdam • Section Computational Science (Sloot, Belleman) • Computer Architecture and Parallel Systems group • Leiden University Medical Center (LUMC) • LKEB (Reiber, vd Geest, Schaap) • Stanford University • Biomedical department (Zarins, Taylor) • SARA Computing and Networking Services • NIKHEF • AMOLF • CWI R.G. Belleman, SCS/UvA

  14. R.G. Belleman, SCS/UvA

  15. Middleware • Communication interface between simulation and interactive exploration environment • The High Level Architecture (HLA) • Specification by DoD, USA for distributed interactive simulation • Specification for the communication between distributed, heterogeneous simulation resources • Allows for control of spatial and temporal effects in distributed interactive systems R.G. Belleman, SCS/UvA

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