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2023 International Conference on Evolutionary algorithms and Soft Computing Techniques, EASCT 2023

作者： Zhang, Zhengyang The First Affiliated Hospital of Hebei North University Zhangjiakou China

ISBN: (纸本)9798350313413

The ray casting algorithm plays an important role in improving medical images and edge detection. Medical imaging typically includes a large amount of image data, such as computed tomography, magnetic resonance imaging, etc. These data need to be effectively and accurately processed and analyzed in order for doctors to make correct diagnoses. The ray casting algorithm is a method that allows for effective and accurate processing of medical images. This article mainly used experimental methods and algorithm comparison to analyze the running time and accuracy of medical images using different algorithms. The experimental results showed that the image detection accuracy using the improved ray casting algorithm exceeds 95%, which can achieve the enhancement and edge detection of precise medical images, and the effect is better than traditional image processing algorithms. ray casting algorithms can quickly and accurately render medical images, allowing doctors and researchers to better understand and analyze image information. Through the ray algorithm, the voxel-level enhancement and operation of the medical image are realized to improve the contrast and clarity of the image. To detect and extract edge information in medical images to help assist diagnosis and disease analysis. © 2023 IEEE.

关键词： edge detection image enhancement medical imaging ray casting algorithm

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Large-Scale Finite Difference Grid Generation and Visualization Method Based on ray casting algorithm

Large-Scale Finite Difference Grid Generation and Visualizat...

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作者： Tie-chang MA Tian-bao MA Li HAO State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology School of Science Beijing University of Civil Engineering and Architecture

Finite difference method(FDM) is one of the most popular method for explosion ***-scale,accuracy and automatic grid generation is the essential for numerical *** kinds of grid generation method are wildly used:ray casting method and slicing *** this paper,the ray casting method is optimized and some special cases of algorithm are analyzed,which improved the efficiency and stability for large-scale grid generation.A facet searching method is proposed to improve the performance of ray casting *** efficient data storage method is proposed for storing and visualizing grid data,which makes it possible to display trillions of *** advantages of modified ray casting algorithm are presented through performance comparison between ray casting and slicing method in different ***,examples of grid generation and explosion simulation are *** accuracy and practicability of algorithm is proved.

关键词： Grid generation Numerical simulation ray casting algorithm Slicing algorithm

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i4Ocean: transfer function-based interactive visualization of ocean temperature and salinity volume data

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International Journal of Digital Earth 2021年第6期14卷 766-788页

作者： Fenglin Tian Qing Mao Yazhen Zhang Ge Chen Department of Marine Technology Ocean University of ChinaQingdaoPeople’s Republic of China Qingdao National Laboratory for Marine Science and Technology QingdaoPeople’s Republic of China

In this paper,we present a novel ocean visualization framework,which focuses on analyzing multidimensional and spatiotemporal ocean ***-based visualization methods are explored to effectively visualize ocean *** improved ray casting algorithm for heterogeneous multisection ocean volume data is presented.A two-layer spherical shell is taken as the ocean data proxy geometry,which enables oceanographers to obtain a real geographic background based on global *** efficient ray sampling technique including an adaptive sampling technique and a preintegrated transfer function is proposed to achieve high-effectiveness and high-efficiency ***,an interactive transfer function is also designed to analyze the 3D structure of ocean temperature and salinity anomaly *** on the framework,an integrated visualization system called i4Ocean is *** visualization of ocean temperature and salinity anomalies extracted interactively by the transfer function is demonstrated.

关键词： Ocean temperature and salinity data ray casting algorithm transfer function spherical volume rendering GPU

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Multiple-Volume Volumetric Rendering Using Graphic Accelerator 44

Multiple-Volume Volumetric Rendering Using Graphic Accelerat...

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44th Latin American Computing Conference on Informatics (CLEI)

作者： Serapiao, Raphael Leite Ramos, Jeferson Vieira da Rocha Fernandes, Anita Maria UNIVALI Curso Ciencia Comp Campus Kobrasol Sao Jose SC Brazil

ISBN: (纸本)9781728104379

Real-time visualization of volumetric data sets demands high computational performance and large in-memory storage capacity. With the technological advance, the means used to acquire these sets, such as Computed Tomography or Magnetic Resonance Imaging, underwent improvements that resulted in a significant increase of the amount of information collected per sample, making it necessary to develop techniques to generate the visualization of this large quantity of information. The research presents in this paper has the purpose to develop a three-dimensional visualization tool to represent in real time volumetric data with the size of hundreds of megabytes. This tool is based on the ray casting algorithm using graphical acceleration features. To achieve this goal, a methodology was used that involved dividing the volume of data into smaller parts, compatible with the memory limitation of the video hardware. Then the data is used to compose a high quality final image representing the information contained in the volume. In order to evaluate and validate this methodology, comparative tests are performed between the standard rendering procedure and the procedure used in this research.

关键词： Three-dimensional visualization Real time volumetric ray casting algorithm Graphical acceleration features

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Study on Mobile Object Positioning and Alarming System Based on the "Map World" in the Core Area of the Silk Road Economic Belt

Study on Mobile Object Positioning and Alarming System Based...

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International Symposium on Earth Observation for One Belt and One Road (EOBAR)

作者： Mu, Kai Xinjiang Acad Surveying & Mapping Urumqi 830002 Peoples R China Natl Adm Surveying Mapping & Geoinformat Engn Res Ctr Cent Asia Geoinformat Dev & Utilizat Urumqi 830002 Peoples R China 2 Inst Surveying & Mapping Xinjiang Uygur Autonom Urumqi 830002 Peoples R China

The established "Map World" on the National Geographic Information Public Service Platform offers free access to many geographic information in the Core Area of the Silk Road Economic Belt. Considering the special security situation and severe splittism and anti-splittism struggles in the Core Area of the Silk Road Economic Belt, a set of moving target positioning and alarming platform based on J2EE platform and B/S structure was designed and realized by combining the "Map World" data and global navigation satellite system. This platform solves various problems, such as effective combination of Global Navigation Satellite System (GNSS) and "Map World" resources, moving target alarming setting, inquiry of historical routes, system management, etc.

关键词： Positioning system Alarming system ray casting algorithm J2EE platform B / S structure GNSS Silk Road Economic Belt

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An estimate of the time-varying temperature field of the main reflector and subreflector of the Shanghai 65 m radio telescope under solar illumination

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INTERNATIONAL JOURNAL OF STEEL STRUCTURES 2016年第1期16卷 115-124页

作者： Zhong Jie Qian Hongliang Fan Feng Shen Shizhao Harbin Inst Technol Minist Educ Key Lab Struct Dynam Behav & Control Harbin 150090 Peoples R China Harbin Inst Technol Sch Civil Engn Harbin 150090 Peoples R China Harbin Inst Technol Weihai Dept Civil Engn Weihai 264209 Peoples R China

The time-dependent temperature fields of the reflectors of the Shanghai 65 m radio telescope are investigated numerically, taking account of the non-uniform heating of the reflector surfaces due to solar illumination and the constantly changing ambient air temperature. This paper utilizes a ray casting algorithm to calculate the borderline separating the reflector areas in shadow and in sunshine, aiming to provide an accurate calculation of the solar energy absorbed. Then a ray tracing algorithm is utilized to calculate the total solar energy that is reflected by the main reflector area and received by the subreflector surface area. Finally, the solar energy is used as the main thermal load on the reflector surface to numerically examine the temperature distribution on both the main reflector and the subreflector. The results illustrate that the time-varying temperature fields of the reflectors of a radio telescope due to asymmetric solar illumination can be accurately simulated utilizing the ray casting algorithm and the ray tracing algorithm. The occurring periods and avoidance zones of the overheating of the subreflector are identified, among which the maximum temperature of the subreflector reaches 144.9A degrees C. These dangerous observation zones should be avoided during the operation of the radio telescope.

关键词： radio telescope temperature field solar illumination ray casting algorithm ray tracing algorithm

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An octree ray casting algorithm based on Multi-core CPUs

An octree ray casting algorithm based on Multi-core CPUs

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International Symposium on Computer Science and Computational Technology

作者： Gu, Jing Wei, Song Harbin Univ Sci & Technol Inst Comp Sci & Technol Harbin Peoples R China

ISBN: (纸本)9780769534985

In order to resolve the tremendous computation and the low speed of ray casting volume rendering, this paper presents an octree ray casting algorithm based on Multi-core CPUs, Through the merger of the same properties adjacent nodes, the classic octree structure to be optimized, reduces the storage space and improves the octree traversing speed. Simultaneity it combines the Multi-core CPUs with OpenMP parallel technology to increase volume rendering speed. The experiment shows that this algorithm can accelerate the speed of ray casting and doesn't degrade the image quality.

关键词： volume rendering ray casting algorithm octree multi-core CPUs OpenMP prallel technology

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A clinically feasible method for the detection of potential collision in proton therapy

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MEDICAL PHYSICS 2012年第11期39卷 7094-7101页

作者： Zou, Wei Lin, Haibo Plastaras, John P. Wang, Huanshu Viet Bui Vapiwala, Neha McDonough, James Tochner, Zelig Both, Stefan Univ Penn Dept Radiat Oncol Philadelphia PA 19104 USA Drexel Univ Dept Mech Engn Philadelphia PA 19104 USA

Purpose: Potential collision between the patient/couch and the gantry could delay the start of the treatment and reduce clinical efficiency. The ability to accurately detect possible collisions during the treatment planning phase is desired. Such collision detection should account for the specific proton gantry design, the treatment beam configuration, couch orientation, and the patient specific geometry. In this paper the authors developed an approach to detect possible patient-machine collisions using patient treatment plan data. Methods: The geometry of the machine and the patient was reconstructed relative to the isocenter of the proton treatment room. The surface contour of the gantry was first captured from the proton computer aided design and reconstructed to account for specific gantry rotation, snout position, collimator rotation, and range compensator dimensions based on the patient treatment plan data. The patient body and couch contours were captured from the patient's CT DICOM structure file. They were reconstructed relative to the isocenter taking into account treatment couch rotation. For potential collision that occurs at body portions where no CT images exist, scout images are used to construct the body contour. A software program was developed using a ray casting algorithm that was applied to detect collisions by determining if any of the patient and couch contour points fall into the spatial polygons formed by the proton gantry surfaces. Results: Twenty-four patient plans with or without potential collisions were retrospectively identified and analyzed using the collision detection software. In addition, five collision cases were artificially generated using an anthropomorphic phantom. The program successfully detected the collisions in all cases. The calculation time for each case was within 20 s. The software program was implemented in the authors' clinic to detect patient-gantry or gantry-couch collisions in the treatment planning phase. Conclu

关键词： collision detection proton therapy patient specific ray casting algorithm

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SPEEDING-UP RE-SAMPLED algorithm IN ray casting VOLUME RENDERING OF MEDICAL IMAGES

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Transactions of Nanjing University of Aeronautics and Astronautics 2005年第1期22卷 52-58页

作者：陶玲王惠南田芝亮南京航空航天大学自动化学院空军机关医院内科

ray casting algorithm can obtain a better quality image in volume rendering, however, it exists some problems, such as powerful computing capacity and slow rendering speed. How to improve the re-sampled speed is a key to speed up the ray casting algorithm. An algorithm is introduced to reduce matrix computation by matrix transformation characteristics of re-sampling points in a two coordinate system. The projection of 3-D datasets on image plane is adopted to reduce the number of rays. Utilizing boundary box technique avoids the sampling in empty voxel. By extending the Bresenham algorithm to three dimensions, each re-sampling point is calculated. Experimental results show that a two to three-fold improvement in rendering speed using the optimized algorithm, and the similar image quality to traditional algorithm can be achieved. The optimized algorithm can produce the required quality images, thus reducing the total operations and speeding up the volume rendering.

关键词： volume rendering ray casting algorithm acceleration algorithm re-sampled algorithm

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Fast volume rendering method for 3D seismic volume data

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Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of Computer-Aided Design and Computer Graphics 2005年第5期17卷 1008-1012页

作者： Ma, Ren'an Zhang, Erhua Yang, Jingyu Department of Computer Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China

This paper presents a novel fast volume rendering method-ISO-value Voxel Projection (IVP) method, specially applied for the interpretation of seismic volume data. The method can be implemented on common PCs, and is less dependent on graphics hardware. The rendering of the method allows basically interactive effect, with its time spending down to 1/16-1/8 of ray-casting calculation. However, the quality of the images produced is not very good, but good enough for the analysis and visualization to the seismic data.

关键词： ISO-value voxel projection ray casting algorithm Volume render

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