研究目的
To develop an accurate and systematic geometric calibration method for an optical surgical navigation system that comprises NIR tracking and structured light components, addressing the issues of time consumption and manual error in marker-based registration.
研究成果
The proposed geometric calibration method is robust and accurate, achieving high precision in 3D reconstruction and instrument tracking for surgical navigation, with errors below 0.3 mm. It simplifies the calibration process and effectively eliminates distortion effects, making it suitable for clinical applications.
研究不足
The calibration method may be dependent on the specific design of the calibration board and the quality of image capture. Potential areas for optimization include handling more complex distortions and improving automation further to reduce any residual manual steps.
1：Experimental Design and Method Selection:
The study designs a calibration board with retroreflective 2D markers and parallel white lines to simultaneously calibrate NIR tracking and structured light components. It uses Zhang's method for camera calibration and a conicoid model for structured light sheet calibration.
2：Sample Selection and Data Sources:
A planar board, a cylindrical surface, a calibration board with small circles, and a head phantom are used as measured objects. Images are captured by cameras in different positions and poses.
3：List of Experimental Equipment and Materials:
Digital cameras (YIOKIO YKSA-200-50M), DLP projector (DOSTYLE IP303), calibration board with specific dimensions and markers.
4：Experimental Procedures and Operational Workflow:
Place the calibration board in the field of view, project structured light, capture images synchronously, extract feature points automatically, calibrate cameras and structured light sheets using optimization algorithms, and validate with reconstruction and tracking experiments.
5：Data Analysis Methods:
Use Levenberg-Marquardt algorithm for optimization, calculate errors (mean error, standard deviation) between measured points and fitted surfaces (plane, cylinder), and evaluate tracking accuracy.
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