A Method for Lung Boundary Correction Using Split Bregman Method and Geometric Active Contour Model

摘要

In order to get the extracted lung region from CT images more accurately, a model that contains lungregion extraction and edge boundary correction is proposed. Firstly, a new edge detection function is presented withthe help of the classic structure tensor theory. Secondly, the initial lung mask is automatically extracted by an improvedactive contour model which combines the global intensity information, local intensity information, the new edgeinformation, and an adaptive weight. It is worth noting that the objective function of the improved model is convertedto a convex model, which makes the proposed model get the global minimum. Then, the central airway was excludedaccording to the spatial context messages and the position relationship between every segmented region and therib. Thirdly, a mesh and the fractal theory are used to detect the boundary that surrounds the juxtapleural nodule. Finally, the geometric active contour model is employed to correct the detected boundary and reinclude juxtapleuralnodules. We also evaluated the performance of the proposed segmentation and correction model by comparing withtheir popular counterparts. Efficient computing capability and robustness property prove that our model can correctthe lung boundary reliably and reproducibly.