M Manivannan | PubMed Health

PubMed2002

Multimodal simulation of laparoscopic Heller myotomy using a meshless technique.

In this work we focus our attention on developing a surgical simulator for performing laparoscopic Heller myotomy using force feedback. A meshless numerical technique, the method of finite spheres, is used for the purpose of physically based, real time haptic and graphical rendering of soft tissues. Localized discretization allows display of deformations in the vicinity of the tool tip as well as interaction forces at high update rates (kHz). Novel cutting algorithms are implemented using point-based representation of anatomical models. Graphical rendering is accomplished by using a recently developed volumetric rendering technique known as splatting.

Computer Graphics↗

PubMed2002

A new approach for the synthesis of glistening effect in deformable anatomical objects displayed with haptic feedback.

An environment mapping approach for texture mapping of anatomical objects with glistening was studied and implemented in surgical simulation. A classifier based on the generalized goal of achieving glistening effect, which depends on the underlying physics and the mapped data, was used as a visual metric and shown to be realistic in the presence of achieving the desired quality in real time in the presence of haptic feedback. The proposed approach was compared with the standard texture mapping approaches used in existing surgical simulation methods that generally suffer from texture stretching and with little or no glistening effect. In our work, we have successfully applied environment mapping techniques for realistic real-time rendering of anatomical objects. We also show several examples of anatomical objects with glistening effects that mimic real anatomical objects.

Computer Simulation↗