Basic study of the theory of navigation diagnosis and algorithms.

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(1)Strctuarizing virtualized human body.Segmentation algorithm for all kind of organs which may be contained in the virtualized human body VHB was studied. Recognizing borders of lung field, heart, large vessels in the mediastinum, and nodules in lay was studied and basic procedures to realize it were developed.(2)Autmated navigation(a)A method to extract center lines of organs was developed for automatic setting of a navigation path.(b)Automatic navigation was performed along the path generated by the above method and the path setting was made sure to be reasonable.(c)Method to watch the occurrence of over loohing and to present overlooked pants of the wall of the argen to be examined were developed and it was shown experientally that they work well using seat CT images.(3)Integration with a real test image : We developed the methods to automatically estimate the movement of real endoscopy using images, and to superimpose virtual endoscope images are real endoscope images in the visual field of a real endoscope.(4)Experiment All of these were tested using real and restual endoscopy and a few real CT images of chest. Furthermore the virtual endoscopy sustem for educational use was also developed and evaluated by the application to real course of a medical college.