Study On Navigation Path Correction In Neurosurgical Navigation Based On Near Infrared Spectroscopy

At present, navigation path deviation caused by brain shift is the main factor that affects the accuracy of neurosurgical navigation. The near infrared spectroscopy (NIRS) technology can effectively identify the tissue and target real time, reflect the navigation path information, therefore, it provides an effective method for real time navigation path correction in neurosurgical navigation. In this paper, navigation path correction method based on near infrared spectroscopy is studied.First of all, we establish a relational model on the basis of near infrared reduced scattering coefficient and MRI data. Take the phantom models as the research objects, combine NIRS signal and MRI gray signal to establish the model of such two signals, which lays the foundation for NIRS assisted surgical navigation. Secondly, propose a real time correction model. The gray information of navigation path is regarded as the priori knowledge of the real time correction model, the curvatures of sampling points are calculated by Hermite interpolation, and the Mean Hausdorff distance is used as measurement criterion to match deviation path feature segments, determining the position of the navigation path that offset the planned path. Finally, the software framework is designed by MFC library and the VTK toolkit, the software of the real time path correction model is completed and achieves the desired results.The innovations of this study are as follows: (1) A new method of neurosurgical navigation based on near infrared spectroscopy is presented to resolve navigation path deviation. (2) Take phantom models as the research objects to simulate the optical properties of brain tissue, then the model of the reduced scattering coefficient and the gray information is established, which lays the foundation for NIRS assisted surgical guidance. (3) Establish real time correction model based on NIRS, use curvatures match algorithm to determine the position of the navigation path that offset the planned path and guide real time path correction in surgery.