Papers by Keyword: Volume Rendering

Abstract: Medical visualization requires interdisciplinary groups of researchers to analyze and explore medical data. Visualizing medical data can use open-source visualization software to avoid administration effort in medical visualization collaboration works. Visualization Toolkits (VTK) is a free, open source for medical visualization. VTK has been used to reconstruct medical images. However, few studies have used VTK to visualize DICOM data from Computed Tomography (CT) scan images using local hospital data in Indonesia. This study aims to reconstruct DICOM data from CT scan of the local hospital in Kupang city, Province Nusa Tenggara Timur, Indonesia. We used VTK to visualize the CT scan images of the head, thorax, and abdomen into two-dimensional (2D) and three-dimensional (3D) images. The DICOM data was visualized first in 2D, and then it was reconstructed into 3D using ray casting and volume rendering algorithm on VTK 8.2. The VTK was built on C++ and Visual Studio 2017. We have successfully demonstrated VTK to visualize 2D and 3D CT scan data from the local hospital in Kupang city. In the future, VTK has the potential to be used by a group of researchers using local hospital data in Indonesia to visualize 2D and 3D CT scan images.

Abstract: Based on the simple transfer function design, this thesis presents a technology for complicated transfer function design. It converts complicated transfer function design problem into the fusing of several simple transfer function. The keystone is to formulate the transfer function fusing problem into searching for optimal fusing proportion, and to generate the new fusing proportion using a similarity evaluation method, which is based on expectation fitness. To a large extent, it simplifies the design process of complicated transfer function.

Abstract: This paper proposes a three-dimensional CT imaging (3DCT) method to show the anatomical structures. With the CT volume scanning data, 3DCT imaging with volume rendering of separating, fusing, opacifying and false-coloring (SFOF-VR) techniques was done on the workstation. SFOF-VR, with separately and jointly showing the complicated anatomy and their spatial relations, is valuable in finding the variations of bone, artery and vein, and diagnosing their diseases. When comparing with routine volume rendering (R-VR), SFOF-VR provides more clear and direct anatomical basis for imaging diagnosis and surgical operation.

Abstract: Volume rendering is an important visualization technique that can accurately display the interior information of data. The Ray-casting algorithm is simple and easy to realize, which often apply to area needs high quality resulting image. The new algorithm in this paper uses a spherical bounding box to remove useless rays, an adjustable threshold to skip the empty voxels and avoid unnecessary interpolation computing. To further accelerate the rendering speed, an adjustable error is set to change interpolation types. Experiment proves that the new algorithm effectively accelerates the rendering speed and guarantees the rendering quality.

Abstract: To address the air pollution diffusing problem, a visualization algorithm based on fluid diffusion physical model and volume rendering is proposed to simulate the diffusion process epically for the urgent pollution accidents. The diffusion model is based on the simplified heat diffusion equation and the basic vortex constraint. The texture mapping based volume rendering method is adapted to handle the visualization algorithm. In addition, the render process adopts the GPU to implement the real-time visualization rendering.

Abstract: Scientific researches are always accompanied with a large number of complex data. Thus, it is important to view and analysis these data or objects in a much more efficient way. Viewpoint selection can improve both the speed of rendering and the efficiency of data understanding, became a hot topic in research, and is applied to various research areas. Viewpoint selection considerably influences the amount of information contained in the projected images, has been extensively studied in many areas such as: volume rendering, image-based modeling, object recognition, etc. most of the studies utilizing the information theoretical framework. This paper reviews the relevant literatures on this topic by summarizing the development and application of the technology, and put forward some ideas for future development.

Abstract: Volume rendering is an important issue in the field of images visualization, which can display the details of the volume data intuitively. In this paper, we provide an new transfer function for volume visualization of photographic data set. LH histogram and color gradient are used for opacity design. And special organ can be enhanced in 3D view for special mission. We use GLSL (OpenGL Shading Language) for the GPUs accelerate. VHP data set is used for test and the result confirms that our method is effective.

Abstract: Industrial computed tomography (ICT) is an advanced non-contact non-destructive testing technique and plays a key role in many fields. Low imaging efficiency is one of the drawbacks of ICT towards engineering applications. In this paper, we report the design and realization of real-time three-dimensional Visualization System for ICT based on visualization toolkit (VTK) and the graphics processing unit (GPU) technique. It greatly improves the imaging speed by developing the new techniques in three aspects such as image reconstruction, data compression and fast volume rendering with GPU and VTK. It will find applications in three-dimensional ICT systems.

Abstract: Image-dependent color gamut mapping can avoid over compression of the image gamut, so it is able to protect the accuracy in color transfer. The premise of realizing image-dependent color gamut mapping is to determine the image color gamut boundary quickly. Now several techniques for the computation of gamut boundary have been presented in the past, e.g. the convex hull algorithm and the segment maxima algorithm. However, the printing image tend to have a higher resolution, it can be very slow and less efficient while using these methods to determine the image gamut boundary. In this article we will introduce a new pre-processing method based on volume rendering to process the image data to improve the speed of gamut visualization.

Abstract: This paper puts forward a survey on the existing 3D medical image visualization methods. These methods are classified into two groups and typical algorithms in each group are described and analyzed. At last future research directions are discussed.