To the Editor:Hepatocellular carcinoma(HCC)is a prevalent form of gastrointestinal malignancies.The current combination of immunotherapy and other treatments improves overall survival compared to conventional therapie...To the Editor:Hepatocellular carcinoma(HCC)is a prevalent form of gastrointestinal malignancies.The current combination of immunotherapy and other treatments improves overall survival compared to conventional therapies,but the immunosuppressive microenvironment of HCC is a significant barrier to the efficacy of immunothera-peutic drugs[1].Tumor immune escape is promoted by interactions among immunosuppressive cells,including tumor-associated macrophages,marrow-derived suppressor cells,tumor-associated neutrophils,cancer-associated fibroblasts,and tumor-infiltrating Tregs[2].展开更多
A new method of MRI brain segmentation integrates fuzzy c-means （FCM） clustering and rough set theory. In this paper, we use rough set algorithm to find the suitable initial clustering number to initial clustering c...A new method of MRI brain segmentation integrates fuzzy c-means （FCM） clustering and rough set theory. In this paper, we use rough set algorithm to find the suitable initial clustering number to initial clustering centers for FCM. Then we use FCM to MRI brain segmentation, but the algorithm of FCM has the limitation of converging to local infinitesimal point in medical segmentation. While avoiding being trapped in a local optimum, we use the particle swarm optimization algorithm to restrict convergence of FCM which can reduce calculation. The final experiment results show that improved algorithm not only retains the advantages of rapid convergence but also can control the local convergence and improve the global search ability. The method in this paper is better than that of cluttering performance.展开更多
To the Editor： Computed tomography （CT） is a common guiding method in clinical practice for percutaneous biopsy and treatment. The key of CT guidance is how to calculate the bed coordinates corresponded to the diag...To the Editor： Computed tomography （CT） is a common guiding method in clinical practice for percutaneous biopsy and treatment. The key of CT guidance is how to calculate the bed coordinates corresponded to the diagram layer coordinates. The author found that the position of the puncture point is completely correct when gantry angle is 0°.展开更多
基金supported by a grant from Zhejiang Province Public Welfare Technology Application Research Funding Project(GD22H036691).
文摘To the Editor:Hepatocellular carcinoma(HCC)is a prevalent form of gastrointestinal malignancies.The current combination of immunotherapy and other treatments improves overall survival compared to conventional therapies,but the immunosuppressive microenvironment of HCC is a significant barrier to the efficacy of immunothera-peutic drugs[1].Tumor immune escape is promoted by interactions among immunosuppressive cells,including tumor-associated macrophages,marrow-derived suppressor cells,tumor-associated neutrophils,cancer-associated fibroblasts,and tumor-infiltrating Tregs[2].
文摘A new method of MRI brain segmentation integrates fuzzy c-means （FCM） clustering and rough set theory. In this paper, we use rough set algorithm to find the suitable initial clustering number to initial clustering centers for FCM. Then we use FCM to MRI brain segmentation, but the algorithm of FCM has the limitation of converging to local infinitesimal point in medical segmentation. While avoiding being trapped in a local optimum, we use the particle swarm optimization algorithm to restrict convergence of FCM which can reduce calculation. The final experiment results show that improved algorithm not only retains the advantages of rapid convergence but also can control the local convergence and improve the global search ability. The method in this paper is better than that of cluttering performance.
文摘To the Editor： Computed tomography （CT） is a common guiding method in clinical practice for percutaneous biopsy and treatment. The key of CT guidance is how to calculate the bed coordinates corresponded to the diagram layer coordinates. The author found that the position of the puncture point is completely correct when gantry angle is 0°.
