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Proceedings Paper

Dynamic Deformation Mapping Of A Trachea Model By Grating Projection Technique
Author(s): J. M. Piroird; I. E. Magnin; C. Delpuech; M. Thiriet
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Paper Abstract

3-D dynamic deformation of the trachea during forced expiration is indirectly known through the flow measure. A better knowledge of this deformation would be of great interest for the understanding of the trachea behaviour in such conditions, but an actual in vivo measure is rather difficult. Consequently, a simulated forced expiration experiment is conducted using a silicone trachea model and an isolated human trachea subjected to controlled lowerings of pressure. In a first step, a grating projection technique is used to measure the 3-D contours of these models. A detailed description of the optical device is given. The optical and numerical calibrations of the recording system are then amply described. In a second step, the model outlines are recorded. The grid (picture 1) is projected on to the studied object (picture 2). These two resulting pictures are then used to reconstruct the trachea in a quadrant with a suitable numerical stereographic method. In a third step, two projectors coupled to two cameras are used to allow the acquisition of the whole model surface. A series of distinct recordings are obtained for various pressure values inside the trachea. If the model has deformed, the deviation of each stripe from its previous position or the new object contours can be computed, leading to a quantitative volumic deformation measure. Finally, an actual 3-D deformation analysis of the phantom is forecast by the mean of real-time data acquisition with two TV cameras.

Paper Details

Date Published: 7 July 1986
PDF: 6 pages
Proc. SPIE 0602, Biostereometrics '85, (7 July 1986); doi: 10.1117/12.956294
Show Author Affiliations
J. M. Piroird, LTSU INSERM-INSA (France)
I. E. Magnin, LTSU INSERM-INSA (France)
C. Delpuech, Hopital St Antoine (France)
M. Thiriet, Hopital St Antoine (France)

Published in SPIE Proceedings Vol. 0602:
Biostereometrics '85
A. M. Coblentz; Robin E. Herron, Editor(s)

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