三维医用电子内窥镜可视化中的几何畸变

Geometric distortions in three-dimensional medical electronic endoscopic visualization

三维医用电子内窥镜已经广泛应用于各类医学诊断、微创手术以及医学培训。三维内窥镜可视化过程中的立体空间几何畸变将直接影响医护人员对于病灶相对大小和距离的视觉感知精确度,同时也可能成为三维内窥镜使用过程中影响视觉舒适度的重要因素之一。现有研究往往仅关注立体影像获取过程中平面图像的畸变及其矫正,而忽略了可视化过程中显示系统不匹配及人眼对三维影像的感知特性造成的立体空间几何畸变。本文通过对三维医用电子内窥镜影像获取、显示及感知过程的分析,建立了三维医用电子内窥镜可视化模型。理想的三维内窥镜影像感知是真实世界空间在各个维度等比例放大的虚拟空间立体感知,三维内窥镜的参数与可视化过程的参数必须匹配才能达到理想的无畸变各维度等放大率效果,最终实现精确的视觉感知以及良好的使用舒适度。研究内容有望为三维影像获取与可视化在医疗领域更为精确和舒适的应用提供理论参考。

The three-dimensional medical electronic endoscope system is widely used for medical diagnosis,minimally invasive surgery and medical training.The geometric distortions during the visualization of the three-dimensional endoscope will affect the relative size and distance estimation accuracy of the nidus for the medical staff,and also may be one of the important factors inducing the visual discomfort.Existing researches only focused on the distortions of the two-dimensional image and its correction.The three-dimensional space geometric distortions during the visualization due to the mismatching of the three-dimensional display system and the characteristics of human eye three-dimensional perception are usually ignored.Based on the analysis of three-dimensional medical electronic endoscope image acquisition,display and perception process,the model of three-dimensional medical electronic endoscope system is established.The ideal three-dimensional endoscope image visualization is the equally magnified virtual space based on the real-world space in all dimensions,and the matching of parameters between three-dimensional endoscope image capture and visualization can achieve this goal,and finally realize the precise visual perception and well visual comfort.The results may provide some theoretical guidance for more precise and comfortable utilization of the three-dimensional image capture and visualization in medical domain.