Magnetic field deformation calibration tool and method in electromagnetic navigation system

Abstract

The invention provides a magnetic field deformation calibration tool and method in an electromagnetic navigation system. The method comprises the following steps: firstly, placing a magnetic field generator in a working environment used by a magnetic field in a data training stage, and collecting the magnetic field coordinates at the positions of equidistant grids on a coordinate collection plate;obtaining the magnetic field coordinate values of all points on the three-dimensional equidistant grid lines, and solving the deformation quantity of the magnetic field coordinates according to the physical coordinates defined by the grid lines and the collected corresponding magnetic field coordinates; combining the deformation quantities obtained in different magnetic field working environmentsto form a magnetic field deformation statistical model; and in the using and operating stage, collecting local magnetic field coordinates once on the coordinate collecting plate to obtain local deformation quantity, and obtaining the global deformation quantity value of the current magnetic field coordinates by obtaining sparse expression. According to the present invention, the method has the advantages of quickness, accuracy and universality, the problem that electromagnetic navigation is easily interfered by environmental factors is quickly solved through sparse solution of the statisticalmodel of the magnetic field deformation data, and the navigation system is more accurate.

Description

technical field [0001] The invention relates to the technical field of magnetic field deformation calibration, in particular to a magnetic field deformation calibration tool and method in an electromagnetic navigation system. In particular, it relates to an application for assisting accurate positioning under a medical operation navigation system. Background technique [0002] With the continuous development of science and technology, people pay more and more attention to minimally invasive precise interventional positioning surgery. Although interventional methods are good, positioning is very difficult. Therefore, computer-aided methods can help instruments to perform accurate spatial positioning. In practice, the methods of assisting surgical positioning mainly include optical positioning and electromagnetic positioning. The accuracy of optical positioning is high, but it is easily affected by the occlusion of objects in the environment during actual use, and the data is...

AI Technical Summary

Problems solved by technology

This technology is oriented to the shape grid point position data rather than deformation data, which cannot solve the problem of magnetic field deformation in electromagnetic navigation systems

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