3D Reconstruction via Medical Images and Laparoscopic Surgery Simulation System
| Autor: | Wen-Hsu Sung, 宋文旭 |
|---|---|
| Rok vydání: | 2003 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 91 The study integrated virtual reality technology and developed a system which would reconstruct three-dimensional (3-D) models and provide highly accurate volume estimations from selected areas of medical images. After development processes, we devised an experiment to test and verify the results of 3-D reconstruction and volume estimations. The experiment result showed that the appearances of reconstruction models were very similar to the real ones, and the value of volume estimations were very close to the values evaluated by drainage. After verifying the accuracy of volume estimations, another clinical experiment was implemented. Three kinds of tumor volume estimations, including the single maximum diameter method, ellipse method and our 3-D integration method, were performed and the relationship of these volume estimations among associated cervical cancer prognostic parameters was evaluated.This study found that the parameters of lymph nodes metastasis, parametrial involvement and tumor differentiation are volume dependent. 3D-tumor volumetry showed superior discrimination of these parameters than current single maximum diameter evaluation suggesting its potential as a rapid method for initial prediction of prognostic factors in cervical cancer. In this study, a virtual reality-based simulator system was developed for extensive laparoscopic surgery training. The purpose of this study is to assess the feasibility of virtual reality-based laparoscopic gynecology simulation system. Ten healthy, non-disabled volunteers were recruited. The surgical procedure is a process of tubal sterilization by cauterization. Volunteers followed the training procedure fifteen trials in the first test and retest respectively. Stable performances were obtained after about eight trials for all subjects. The results of this study indicate that the system is stable and the system has fair high test-retest reliability. Another thirty two non-disabled volunteers were recruited for participating in the different signal feedback experiment. The purpose of this experiment is to assess the influence of text, sound and lateral view cues on the manipulation performance in the system. The average of task time, error times and clip times are the parameters used to evaluate the manipulation performance. It can be concluded that all of the text, sound and lateral view cues are significant cues of manipulation performance of this simulation system. Finally, we employed another laparoscopic gynecology simulating device with force feedback functions, and devised a new function of changing the field of view of laparoscope camera for enhancing the capability of this simulation system. The feasibility and different signal feedback experiments were executed again. The results of the experimants indicate that the new system is stable and has fair high test-retest reliability. Because of the effects of the functions and design of this experiment, the experiment results shows that the new functions, including both force feedback and changing the field of view of laparoscope camera, are not significant cues of manipulation performance of this simulation system. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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