3D CAD model construction for bio-printing of human tissues
Date Issued
2016
Date
2016
Author(s)
Tseng, Yi-Ching
Abstract
The purpose of this thesis is to develop computer-aided design (CAD) tools to construct 3D bio-printing models of human tissues from medical images. 3D tissue models can also be established by describing spatial shape of tissues with suitable mathematical parameters. The CT scan images of a human tissue, for example coronary artery, are first imported into a CAD software AutoCAD for digitizing 3D boundary points of the tissue. With 3D boundary points at the same elevation from two orthogonal views, a cross section with spline curve can be determined, and then a 3D model can be obtained by lofting cross sections at different elevation. CT scan images can also be used by medical image software for constructing stereolithography (STL) surface models, and the STL surface model is imported to AutoCAD to reconstruct 3D solid model by cross sections from surface model slicing contours at different elevation. For other tissue where CT scans are difficult to obtain, for example human cornea, the 3D model can be established from mathematical parameters that describe the spatial shape of a tissue. A parametric program is developed with a dialog box for specifying parameters such that 3D models constructed for each patient are different. Established 3D human tissue models are sent to 3D printers, and good prototypes are obtained. The results show that the 3D model construction method for human tissues are both fast and effective.
Subjects
3D printing
CT scan images
parametric modeling
coronary artery
cornea
Type
thesis
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