Law of spatial direction changes in the view of endoscope simulated by SketchUp software / 中国组织工程研究

ABSTRACT

The endosopic imaging was simulated using SketchUp software, and the preliminary definitions of the visual relative quantity space (VRQS), visual absolute quantity space (VAQS), and visual space scale unit (length) VSSU (VSUL) were made to discuss characters of them; With the elevation angle or the distance of the endoscope entering the nasal cavity changed, the law and the cause of the spatial directions in the visual field of the endoscope were analyzed by the theory of VRQS, VAQS, and VSSU (VSUL). The perspective law in the 0° VRQS is With the distance to the visual point nearer, the length of the VSSU in the view of the endoscope is longer. If the distance of the endoscope entering the model is increased only, the position of the spatial direction in the view of the endoscope shows the repeatable and substituted characteristics. If the elevation angle of the endoscope is changed only, the spatial directions in the view are changed. The change of the spatial directions in the view could be explained by the theory of VRQS, VAQS, and VSSU (VSUL). The change of the elevation angle of the endoscope can caused the change of the spatial directions in the view. The spatial directions in the view of the endoscope have the repeatable and substituted characteristics; the theory of VRQS, VAQS, and VSSU (VSUL) can completely explained the changes of the spatial directions, which provides a good basis for the operations and the further research.