检索结果-内蒙古大学图书馆

Data augmentation-based three-dimensional reconstruction of meningiomas: An improved K-Modified marching cubes algorithm

引用

BIOMEDICAL SIGNAL PROCESSING AND CONTROL 2025年 104卷

作者： Wang, Ting Sun, Jiakang Ji, Xiangjun Li, Zhenxing Ramik, Dominik M. Zhang, Xiaorui Ma, Chiyuan Nanjing Tech Univ Coll Elect Engn & Control Sci Nanjing 211816 Peoples R China Nanjing Univ Jinling Hosp Affiliated Hosp Dept NeurosurgMed Sch Nanjing Jiangsu Peoples R China Technol Natl Univ Vanuatu Fac Sci Port Vila Vanuatu

Three-dimensional reconstruction of medical images plays a crucial role in aiding diagnosis by providing comprehensive and accurate anatomical information. However, traditional marching cubes algorithms face challenges in generating precise models due to issues such as noise, blurring, and incomplete data in medical images. In this paper, we propose a novel method that combines Generative Adversarial Networks with Mixup data augmentation to address the problem of thick segmentation layers in three-dimensional reconstruction. Additionally, an improved marching cubes algorithm, referred to as K-Modified marching cubes, is introduced to enhance modeling capabilities for multimodal images. Experimental results demonstrate that the proposed method outperforms traditional three-dimensional reconstruction models based on original data and reduces dependency on the number of segmentation layers, offering a more accurate solution for medical image reconstruction.

关键词： Data Augmentation Three-dimensional Reconstruction Medical Images marching cubes algorithm

来源：评论

学校读者我要写书评

暂无评论

Robust generation of the delta volume for the damaged area of a part using the marching cubes algorithm to support additive manufacturing-based part maintenance

引用

INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 2021年第5-6期117卷 1473-1489页

作者： Kim, Youngki Cha, Moohyun He, Fazhi Mun, Duhwan Korea Inst Machinery & Mat 156 Gajeongbuk Ro Daejeon 34103 South Korea Wuhan Univ Sch Comp Sci Wuhan 430072 Peoples R China Korea Univ Sch Mech Engn 145 Anam Ro Seoul 02841 South Korea

A major advantage of additive manufacturing (AM) technology is that a product can be manufactured based on digital models that are generated using a computer-aided design (CAD) system. As a result, AM can be used for both product manufacturing and maintenance. For the maintenance of partially damaged parts using AM, the calculation of the delta volume for the damaged area is required to generate the tool paths for 3D printers. A common approach to obtaining the delta volume is to laser scan the damaged part to obtain a point cloud, which is then regenerated as a mesh model, followed by the use of a Boolean operation with the mesh model for the original undamaged part. However, a major problem with the use of point clouds for damaged parts obtained using laser scanning is that an accurate mesh model is often difficult to obtain due to noise (or outliers) and the deviation of points because of the limitations of the scanner in terms of precision. To solve this problem, the present study suggests extracting a point cloud that corresponds only to the damaged area rather than a point cloud of the entire part. By utilizing the marching cubes algorithm, a method for the robust generation of the delta volume for the damaged area is then proposed. After developing a prototype system to verify the proposed method, delta volume generation experiments are conducted on partially damaged ball valves.

关键词： 3D printing Additive manufacturing Part maintenance Delta volume marching cubes algorithm Partially damaged area

来源：评论

学校读者我要写书评

暂无评论

Propagation-based marching cubes algorithm using open boundary loop

引用

VISUAL COMPUTER 2018年第10期34卷 1339-1355页

作者： Guerra Tsuzuki, Marcos de Sales Sato, Andre Kubagawa Ueda, Edson Kenji Martins, Thiago de Castro Takimoto, Rogerio Yugo Iwao, Yuma Abe, Leonardo Ishida Gotoh, Toshiyuki Kagei, Seiichiro Univ Sao Paulo Escola Politecn Dept Mechatron & Mech Syst Engn Computat Geometry Lab Av Prof Mello Moraes 2231 Sao Paulo SP Brazil Yokohama Natl Univ Hodogaya Ku 79-1 Tokiwadai Yokohama Kanagawa 2408501 Japan

The marching cubes (MC) algorithm is employed to generated triangular meshes for visualizing medical images, sculpture scans and mathematical surfaces. It sequentially traverses cuberille data composed of sampled points of a scalar volumetric data. This paper proposes a propagation-based MC algorithm that uses the open boundary loop concept. The open boundary loop is used to determine adjacent cells for the next iteration of the MC algorithm. After inserting each triangle, the open boundary loop is reevaluated. Simultaneously, it is ensured that all triangles are coherently oriented and there are no holes on the isosurface. Several tests are conducted to determine the performance of the algorithm in comparison with the original MC algorithm. Results from these tests indicate that, for large-scale problems, the proposed algorithm performs better than the original.

关键词： marching cubes algorithm Propagation-based approach Open boundary

来源：评论

学校读者我要写书评

暂无评论

Interactive marching cubes algorithm for intraoral scanners

引用

INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 2017年第5-8期89卷 2053-2062页

作者： Chang, Minho Oh, Ji Woong Chang, Dae S. Park, Sang C. Korea Univ Dept Mech Engn Seoul South Korea Ajou Univ Dept Ind Engn San 5 Suwon 443749 South Korea

This paper proposes a variation of the marching cubes algorithm for intraoral scanners. The intraoral scanning procedure is performed in an interactive manner. During the scanning procedure, the user can check the quality of the intermediate model to decide if further scanning is required. For the scanning procedure, we identify two technological requirements of the marching cubes algorithm: (1) short computation time to minimize the patient's discomfort and (2) efficient generation of an intermediate mesh model by reusing the previous intermediate model. To achieve the required computational speed, we employ the graphics processing unit (GPU)-accelerated hash table to store the truncated signed distance function values, which enables parallel processing of the computational procedure. Further, we develop a local update mechanism to efficiently reuse the previous intermediate model. The proposed procedure was implemented, and the demonstration showed that the proposed GPU-based marching cubes algorithm with the local update mechanism satisfies the two technological requirements of intraoral scanning.

关键词： marching cubes algorithm Range image Intraoral scanner Dental CAD/CAM GPU Hash table

来源：评论

学校读者我要写书评

暂无评论

Three-Dimensional Geological Modeling Method Based on Potential Vector Fields

引用

APPLIED SCIENCES-BASEL 2025年第7期15卷 3594-3594页

作者： Liu, Peigang Li, Zheng Yu, Gang Li, Zongmin China Univ Petr East China Qingdao Inst Software Coll Comp Sci & Technol Qingdao 266580 Peoples R China Shandong Key Lab Intelligent Oil & Gas Ind Softwar Qingdao 266580 Peoples R China

With the development of 3D geological modeling, implicit modeling methods have gradually gained popularity. However, existing potential field methods cannot directly represent unconformable geological interfaces. In response, an implicit modeling method based on a potential vector field was proposed, which generates geological surface models through the potential vector field method and generalized marching cubes algorithm, and visualizes the modeling results. An experiment was conducted on the study area of a certain mineral deposit, and a 3D geological surface model with consistency and no topological errors was established, demonstrating the effectiveness of the method for the surface modeling of unconformity geological interfaces.

关键词： three-dimensional geological modeling implicit modeling potential field method radial basis function marching cubes algorithm

来源：评论

学校读者我要写书评

暂无评论

marching cub es-base d isogeometric topology optimization method with parametric level set

引用

APPLIED MATHEMATICAL MODELLING 2022年 107卷 275-295页

作者： Zhou, Mian Xiao, Mi Zhang, Yan Gao, Jie Gao, Liang Huazhong Univ Sci & Technol State Key Lab Digital Mfg Equipment & Technol 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China Huazhong Univ Sci & Technol Sch Aerosp Engn Dept Engn Mech 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China Wuhan Univ Sci & Technol Key Lab Met Equipment & Control Technol Minist Educ Wuhan 430081 Peoples R China

The level set method can provide superior benefits for topology optimization problems because of its smooth and distinct description of structural boundaries. However, in this method, the elements cut by structural boundaries are not descripted accurately. This paper proposes a marching cubes-based isogeometric topology optimization method with the parametric level set to address this issue. In the proposed method, the marching cubes algorithm is applied in the framework of isogeometric analysis to clearly distinguish the structural boundaries, enabling the creation of an accurate material description model during topology optimization. The relaxed topology derivative (RTD) is introduced to measure the sensitivity of the Lagrange function and alleviate the dependence on the initial design in the level set method. Several 2D and 3D numerical examples for minimizing mean compliance problems are tested to illustrate the effectiveness of the proposed method, including a multi-patch structure with a complicated design domain.(c) 2022 Elsevier Inc. All rights reserved.

关键词： Topology optimization Isogeometric analysis marching cubes algorithm Parametric level set Relaxed topology derivative

来源：评论

学校读者我要写书评

暂无评论

Stress -constrained shape and topology optimization with the level set method trimmed hexahedral meshes

引用

COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2020年 366卷 113061-113061页

作者： Nguyen, Son H. Kim, Hyun-Gyu Seoul Natl Univ Sci & Technol Dept Mech & Automot Engn 232 Gongneung Ro Seoul 01811 South Korea Korea Maritime & Ocean Univ Div Mech Engn 727 Taejong Ro Busan 49112 South Korea

In this paper, we present a novel approach to solve stress-constrained shape and topology optimization problems based on the level set method using trimmed hexahedral meshes. A trimmed hexahedral mesh is generated at each optimization iteration by cutting a regular hexahedral background mesh with the zero-isosurface of a level set function to minimize a volume with stress constraints. A clear and explicit boundary-conforming mesh can be obtained by using trimmed hexahedral elements placed at the boundary of the solid domain, which leads to an accurate estimation of stresses and shape sensitivities. Since the void domain is not considered in the optimization process, the singularity phenomenon in stress-constrained optimization problems is essentially eliminated without using any relaxation technique. Numerical examples show that the proposed method is an efficient and effective approach to solve stress-constrained shape and topology optimization problems.

关键词： Stress constraints Shape and topology optimization Level set method marching cubes algorithm Trimmed hexahedral mesh

来源：评论

学校读者我要写书评

暂无评论

Level set based shape optimization using trimmed hexahedral meshes

引用

COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2019年 345卷 555-583页

作者： Nguyen, Son H. Kim, Hyun-Gyu Seoul Natl Univ Sci & Technol Dept Mech & Automot Engn 232 Gongneung Ro Seoul 01811 South Korea

This paper presents a new approach for level set based shape optimization using trimmed hexahedral meshes that geometrically conform to shape and topology changes during the optimization process. The marching cubes algorithm is employed to generate trimmed hexahedral meshes at each optimization iteration by splitting a regular background hexahedral mesh with the zero-isosurface of a level set function. A simple method is proposed to handle nonconforming polyhedral elements at the interface due to the face ambiguity arising in the marching cubes algorithm. The motion of the zero-isosurface of a level set function is obtained from the solution of the Hamilton-Jacobi transport equation using a normal velocity field defined on the regular background hexahedral mesh. Numerical results show that the present approach provides a natural and effective tool to solve shape optimization problems relying on explicitly discretized meshes of the shapes throughout the optimization process. (C) 2018 Elsevier B.V. All rights reserved.

关键词： Shape optimization Level set method marching cubes algorithm Trimmed hexahedral mesh Polyhedral elements

来源：评论

学校读者我要写书评

暂无评论

Medical Image Segmentation and Reconstruction Based on Bayesian Level Set Method and marching cubes algorithm

Medical Image Segmentation and Reconstruction Based on Bayes...

引用

2nd International Conference on Mechanical and Aerospace Engineering (ICMAE 2011)

作者： Chen, Yao-Tien Yuanpei Univ Dept Comp Sci & Informat Engn Hsinchu Taiwan

ISBN: (纸本)9783037852620

We propose an approach, integrating Bayesian level set method with modified marching cubes algorithm for brain tissue and tumor segmentation and surface reconstruction. First, we extend the level set method based on the Bayesian risk to three-dimensional segmentation. Then, the three-dimensional Bayesian level set method is used to segment solid three-dimensional targets (e.g., tissue, whole brain, or tumor) from serial slice of medical images. Finally, the modified marching cubes algorithm is used to continuously reconstruct the surface of targets. Since each step can definitely obtain an appropriate treatment by statistical tests, the tissue and tumor segmentation and surface reconstruction are expected to be satisfied.\

关键词： Bayesian level set method Bayesian risk marching cubes algorithm

来源：评论

学校读者我要写书评

暂无评论

An interdisciplinary approach to studying archaeological vase paintings using computed tomography combined with mineralogical and geochemical methods. A Corinthian alabastron by the Erlenmeyer Painter revisited

引用

JOURNAL OF CULTURAL HERITAGE 2018年 31卷 63-71页

作者： Karl, Stephan Kazimierski, Kamil S. Hauzenberger, Christoph A. Karl Franzens Univ Graz Inst Archaeol Univ Pl 3 A-8010 Graz Austria Karl Franzens Univ Graz Inst Math & Sci Comp NAWI Graz Heinrichstr 36 A-8010 Graz Austria Karl Franzens Univ Graz Inst Earth Sci Mineral & Petr NAWI Graz Univ Pl 2 A-8010 Graz Austria Dr Emperger Weg 14 A-8052 Graz Austria

This paper presents the results of an investigation of an unusual unpainted area in the Corinthian vase painting silhouettes painting technique during the Archaic Period (late 7th to 6th century BC). A painting of two panthers in the heraldic scheme done by the Erlenmeyer Painter on an alabastron contains a striking unpainted circular area inside the shoulder of one of the panthers. Since this feature cannot be explained by iconographical constraints, it has previously been referred to as an "opening". However, by combining X-ray methods, particularly computed tomography (CT) and related 3D surface renderings, with mineralogical and geochemical methods (SEM-EDS, XRD) and stylistic arguments, we have arrived at a new interpretation. The CT data revealed a feature directly beneath the unpainted circular area that was shaped like an angular plug and had similar structural properties and attenuation coefficients as the surrounding clay matrix. A visible inclusion on the surface of this alabastron was identified as a rock fragment, most likely sandstone or sandy shale, which suggests that a problematic large inclusion had been removed from the vessel and was subsequently filled with clay during the firm leather-hard stage. We argue that the painter intentionally deviated from the usual compositional form by leaving the area of the repair unpainted and adapting the drawing of the panther accordingly. One advantage of this method, particularly for vase collections, is that CT is a non-invasive technique that collects data from the entire ceramic body, which in combination with geoscience methods such as SEM-EDX and XRD allows for minimally invasive analysis that can strengthen the X-ray-based evaluation. Therefore, we contend that integrating CT data combined with mineralogical and geochemical data into pottery studies will open new avenues for the study of ancient vase painting, particularly for interpreting unpainted areas and other irregularities within black-glazed sil

关键词： Corinthian pottery Ancient vase painting Computed tomography marching cubes algorithm Manufacturing technique Erlenmeyer Painter

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：