Knowledge of flow characteristics in human airway and blood vessel is essential to understand the physiological and pathological aspects of respiratory and circulatory systems. Creating an accurate transparent flow passage is indispensable for the successful investigation on the flow inside a complex flow passage of human organ by PIV. The Web-based communication system between multi-researchers and medical doctors is established for making the post-surgery models and to discuss surgery plans. We also introduced a semi-automatic segmentation technique to reconstruct accurate three dimensional computer models from CT data rapidly and conveniently.

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