Real Time Simulation of Phaco-emulsification for Cataract Surgery Training

We present a real‐time simulation of the phaco-emulsification task in a virtualreality training system for cataract surgery. Phaco‐emulsification consists in breaking in small fragments an d completely removing the eye crystalline lens by employing an ultra‐sound tool called phaco‐emulsificator. Our ap proach employs a mesh-less shape‐ based dynamic algorithm integrated with a simplex geometry representation in order to efficiently handle the rendering process and the continuous modifications involved by the surg ical tool interaction, and with a smoothed particle hydrodynamics scheme with spatial ordering for handling fragmen ts interactions. The complete training system also simulates other tasks involved in cataract surgery, like the cor neal incision and the capsulorhexis. The simulator runs on a multiprocessing PC platform and provides realistic ph ysically-based visual simulations of tools interactions. The current setup employs SensAble PHANToM for s imulating the interaction devices, and a binocular display for presenting images to the user.

[1]  Mathieu Desbrun,et al.  Smoothed particles: a new paradigm for animating highly deformable bodies , 1996 .

[2]  Berthold K. P. Horn,et al.  Closed-form solution of absolute orientation using unit quaternions , 1987 .

[3]  Leonard McMillan,et al.  Stable real-time deformations , 2002, SCA '02.

[4]  Reinhard Männer,et al.  Intraocular surgery on a virtual eye , 2002, CACM.

[5]  Terry Hewitt,et al.  Adaptive refinement for mass/spring simulations , 1996 .

[6]  Markus H. Gross,et al.  Particle-based fluid-fluid interaction , 2005, SCA '05.

[7]  Erik Reinhard,et al.  An Ocularist's Approach to Human Iris Synthesis , 2003, IEEE Computer Graphics and Applications.

[8]  Berthold K. P. Horn,et al.  Closed-form solution of absolute orientation using orthonormal matrices , 1988 .

[9]  Markus H. Gross,et al.  Particle-based fluid simulation for interactive applications , 2003, SCA '03.

[10]  Andrew P. Witkin,et al.  Large steps in cloth simulation , 1998, SIGGRAPH.

[11]  Reinhard Männer,et al.  Collision Detection and Tissue Modeling in a VR-Simulator for Eye Surgery , 2002, EGVE.

[12]  Carl-Gustaf Laurell,et al.  Computer-simulated phacoemulsification improvements , 2002, SPIE BiOS.

[13]  Marc Alexa,et al.  Point based animation of elastic, plastic and melting objects , 2004, SCA '04.

[14]  H. Delingette,et al.  Simplex Based Animation , 1993 .

[15]  Mathieu Desbrun,et al.  Dynamic real-time deformations using space & time adaptive sampling , 2001, SIGGRAPH.

[16]  Stephane Cotin,et al.  A hybrid elastic model for real-time cutting, deformations, and force feedback for surgery training and simulation , 2000, The Visual Computer.

[17]  Matthias Müller,et al.  Interactive blood simulation for virtual surgery based on smoothed particle hydrodynamics. , 2004, Technology and health care : official journal of the European Society for Engineering and Medicine.

[18]  Per Nordqvist,et al.  Computer-simulated phacoemulsification , 2001, SPIE BiOS.

[19]  Min Chen,et al.  Deforming and Animating Discretely Sampled Object Representations , 2005, Eurographics.

[20]  Markus H. Gross,et al.  Meshless deformations based on shape matching , 2005, ACM Trans. Graph..

[21]  Leonidas J. Guibas,et al.  Meshless animation of fracturing solids , 2005, ACM Trans. Graph..

[22]  Hervé Delingette,et al.  Nonlinear and anisotropic elastic soft tissue models for medical simulation , 2001, Proceedings 2001 ICRA. IEEE International Conference on Robotics and Automation (Cat. No.01CH37164).

[23]  Andrew Nealen,et al.  Physically Based Deformable Models in Computer Graphics , 2005, Eurographics.