以SketchUp软件模拟量化鼻内镜视觉空间方向的改变规律

应用SketchUp软件模拟量化鼻腔的内镜成像,提出视觉相对(量化)空间、视觉绝对(量化)空间、视觉空间单位(长度)的概念,并探讨其特征;改变进镜距离和仰角,在视觉相对空间、视觉绝对空间内分析视觉空间内空间方向规律及原因,通过视觉空间单位的相关理论予以解释.0°视觉相对空间内透视规律为:与视点的距离越近,视觉单位长度表现为越长;改变进镜距离,空间方向表现重复性和替代性;改变仰角,空间方向发生改变;通过绝对空间、相对空间及视觉空间单位可以完整解释空间方向的改变.结果提示,内镜下空间方向可发生改变,具有重复性和替代性;绝对空间、相对空间和视觉空间单位可完整解释空间方向规律的原理,为空间方向研究奠定了基础,并为手术安全操作提供了重要依据.

Law of spatial direction changes in the view of endoscope simulated by SketchUp software

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.