Simulation and modeling of virtual human and physical interaction

• Κύριος συγγραφέας: Κομνηνός, Χαράλαμπος
• Άλλοι συγγραφείς: Μουστάκας, Kωνσταντίνος
• Μορφή: Thesis
• Γλώσσα: English
• Έκδοση: 2019
• Θέματα: Medical simulation; Real-time; Interactive simulation; Deformation accuracy; Ιατρική προσομοίωση; Πραγματικού χρόνου; Διαδραστική προσομοίωση; Ακρίβεια παραμορφώσεων; 616.025

This research work aims to develop a virtual environment appropriate for interactive (real-time) simulations of medical and surgical interventions. These simulations have many applications including training of surgeons, planning of interventions (for rehearsal and for the validation of a therapy) or providing assistance during a real surgery. Nevertheless, in order to obtain an accurate and realistic simulation of a procedure, we have to simulate with precision the deformation of anatomical structures and the interactions between rigid medical devices and soft tissues. In addition, the simulation must be interactive and computed in real-time to keep the gesture of the physician in the loop of the simulation. The main goal of this research work is to design a simulation which combines a high level of accuracy for the deformations with low level of computation time. First, we present the Co-rotational FEM method which is based on finite element methods (FEM) and computes the biomechanics of anatomical soft tissues. Second, we analyse the dynamic equations of the deformable bodies and we present the Lagrange multipliers approach which handles the interactions in our virtual environment. Due to the fact that visual feedback is not enough, physicians use haptic feedback for guidance. For this reason, we analyse the key concepts of the algorithms dedicated to real-time haptic rendering. Furthermore, we present a detailed analysis of our implementation including a system of human organs such as: lungs, bronchus, diaphragm and thorac, which the user can interact with, in real-time. Finally, we report the results derived from conducted experiments which prove the validity of our application. We propose future work that will establish medical simulation in the field of medicine.