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首页> 外文期刊>Computer Graphics and Applications, IEEE >Simulating Liver Deformation during Respiration Using Sparse Local Features
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Simulating Liver Deformation during Respiration Using Sparse Local Features

机译:使用稀疏的局部特征模拟呼吸过程中的肝脏变形

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摘要

A new method deforms a 3D liver mesh in an arbitrary phase of respiration. During preprocessing, the method step defines a patient-specific deformation space using two polar shapes of the liver during respiration. 3D magnetic resonance imaging captures patient livers during exhaling and inhaling. Next, using a fully automated nonrigid mesh registration, this method creates the two phases' corresponding surface meshes. Then, it defines the respiration's deformation space by extracting deformation gradients between the exhalation and inhalation meshes. At runtime, the method uses sparse local features suitably obtained from 2D ultrasound imaging to solve the constraint optimization problem that minimizes dissimilarity of deformation gradients between the target deformation and the patient-specific deformation space. Researchers used real patient data to evaluate this method, which could be applicable to image-guided tumor ablations.
机译:一种新方法可在任意呼吸阶段使3D肝网格变形。在预处理期间,该方法步骤使用呼吸过程中肝脏的两种极性形状来定义患者特定的变形空间。 3D磁共振成像可在呼气和吸气期间捕获患者肝脏。接下来,使用全自动非刚性网格配准,此方法将创建两个阶段的对应表面网格。然后,它通过提取呼气和吸气网格之间的变形梯度来定义呼吸的变形空间。在运行时,该方法使用从2D超声成像中适当获得的稀疏局部特征来解决约束优化问题,该问题使目标变形和特定于患者的变形空间之间的变形梯度的相异性最小。研究人员使用真实的患者数据来评估这种方法,该方法可能适用于图像引导的肿瘤消融术。

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