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ABSTRACT: A system for interactive, 3--D, craniofacial surgery simulation is presented. It is used for simulation of bimaxillary osteotomies, physiological jaw movement, and for prediction of resulting soft--tissue changes. A 3--D, photorealistic model of the patient's postoperative appearance is computed by the simulation process preoperatively. The system is based on the individual preoperative bone structure of a patient's skull derived from a computer tomography scan and on the patient's photorealistic, preoperative appearance obtained by a laser scanner. The multi--layer soft tissue is represented by springs. The model incorporates additional features such as skin turgor, gravity, and sliding bone contact. The prediction of soft--tissue deformation is computed using an optimization approach. Several optimization methods have been tested and compared with regard to robustness of the simulation result and to computational costs. Realistic osteotomy simulation can be performed interactively due to integrated collision detection. 1
05/2003;
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ABSTRACT: this paper, a technique is described which allows to compare the simulated surgical outcome and the actual surgical result. The surgery simulation is based on a preoperative CT scan of the patient's head and on a preoperative surface scan of the patient's face. The simulated postoperative patient's appearance is compared to a second surface scan which is obtained postoperatively. The pre- and postoperative surface scans, which are di#erent due to the surgery, are registered employing a robust registration method which minimizes the median of Euclidean distances of corresponding points. Parameters of the soft--tissue model, which is used for the surgical simulation process, can be adapted with respect to minimized di#erences of corresponding points of the simulated postoperative and the actual postoperative surface of a patient's face
05/2003;
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ABSTRACT: A system for interactive, 3--D, craniofacial surgery simulation is presented. It is used for the 3--D simulation of osteotomies of the facial and skull bones and for the prediction of soft--tissue changes caused by bone movement. The result of the simulation process is a 3--D, photorealistic model of the patient's postoperative appearance that can be viewed from any position.
05/2003;
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ABSTRACT: A method for computing nonlinear soft--tissue deformation caused by simulated surgical procedures is presented. A mass--spring system is used to model patient individual soft--tissue. Instead of simulating dynamic behaviour, the introduced approach directly estimates the rest position of the system. Very fast and robust nonlinear soft--tissue deformation is computed using an optimization approach.
05/2003;
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ABSTRACT: Computer-based techniques for the simulation of craniofacial surgical procedures and for the prediction of the surgical outcome have been shown to be very useful. However, the assessment of the accuracy of the simulated surgical outcome is difficult. In this paper, a technique is described which allows to compare the simulated surgical outcome and the actual surgical result. The simulated postoperative patient's appearance is compared to a second surface scan which is obtained postoperatively. The pre- and postoperative surface scans, which are different due to the surgery, are registered employing a robust registration method which minimizes distances of corresponding points. Parameters of the soft-tissue model can be adapted with respect to minimized differences of corresponding points of the simulated postoperative and the actual postoperative surface of a patient's face.
Studies in health technology and informatics 02/2002; 85:520-2.
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CARS 2001. Computer Assisted Radiology and Surgery. Proceedings of the 15th International Congress and Exhibition, Berlin, Germany, June 27-30, 2001; 01/2001
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Medical Image Computing and Computer-Assisted Intervention - MICCAI 2001, 4th International Conference, Utrecht, The Netherlands, October 14-17, 2001, Proceedings; 01/2001
