Impact of local oscillator power on SNR in space coherent optical communications

Yingxiu, 孔英秀 Kong; Xizheng, 柯熙政 Ke; Yuan, 杨媛 Yang

doi:10.3788/m0001820164502.222002

Cited by 1 publication

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“…In this article, human brain image is segmented by segmentation algorithm [ 27 ]. The simulation data used in the experiment are provided by McConell Brain Imaging Center and Montreal Neuroscience Research.…”

Section: Methodsmentioning

confidence: 99%

Research on Several Key Problems of Medical Image Segmentation and Virtual Surgery

Luo

Zhang

2022

Contrast Media & Molecular Imaging

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Medical images play an important role in modern medical diagnosis. Many clinicians make correct and appropriate diagnosis and treatment plans by means of medical images. With the development of science and technology, the application of medical image needs not only to simply read the image, but also to fuse advanced technology to analyze and process the image from a deeper level, such as the proposal of virtual surgery. Therefore, this article focuses on several key issues of medical image segmentation and virtual surgery. First, medical images are preprocessed by gray level transformation, interpolation, and noise elimination techniques. Second, level set model-based segmentation algorithm is adopted and improved. Finally, a constrained Delaunay tetrahedron method based on a point-by-point insertion method is proposed to reconstruct the tetrahedron mesh model. In order to eliminate the thin element, the tetrahedron mesh model is optimized. The simulation results show that this article improves the segmentation algorithm based on the level set model, which effectively improves the contradiction between the convergence accuracy and the convergence speed of the algorithm. The proposed tetrahedral mesh reconstruction algorithm realizes the generation of tetrahedral finite element meshes with complex boundaries and improves the quality of the volume model by optimizing the model.

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Section: Methodsmentioning

confidence: 99%