The transepicondylar axis of different position has no effect on volume rendering technique measuring the humeral head retroversion angle with multi slice spiral CT.
肱骨远端不同位置内外上髁轴线对多层螺旋CT容积再现测量肱骨头扭转角没有影响；
During volume rendering, gradient will be used both on the procedure Classification and Shading. So rapidity and accuracy of gradient estimation is important to high quality rendering algorithm.
体绘制流程中，梯度在数据分类和明暗计算中都要用到，因此快速准确的梯度估算对高质量的体绘制算法至关重要。
Volume rendering of irregular data field is a hot but knotty field in VISC recently.
非规则数据场的体绘制是可视化的一个热点和难点。
The speed of volume rendering is the bottleneck of interactive visualization.
体数据的绘制速度是交互可视化的瓶颈。
Objective To describe a spatial data structure called sorted volumetric data structure which speeds up the volume rendering and will not affect image quality.
本文提出一种称为有序体数据的空间数据结构，它可以有效地加速体绘制而对图像质量没有影响。
In order to display important organs outstandingly, a new approach for fast volume rendering algorithm based on mixed data sets was put forward.
为了突出人体重点器官的显示，提出了一种新颖的基于混合数据场的快速体绘制算法。
Volume rendering can be applied in many fields including medical science, meteorology and geological exploration.
体绘制的应用领域十分广泛，涵盖了医学、气象学和地质勘探等领域。
Ray casting is a widely recognized method for high quality volume rendering.
光线投射是一种高质量的体绘制方法。
Algorithm research is main part of visualization research, the thesis refers to two kinds of algorithms for volume rendering: Fourier volume rendering and shear-warp volume rendering.
算法研究是可视化的主要研究领域，本文的研究涉及两类体绘制算法：频域体绘制和错切变形体绘制。
An effective fast volume rendering algorithm is investigated.
研究有效的体绘制加速算法。
Gray scale image interpolation is a preprocessing step for volume rendering in medicine.
灰度图像插值是体绘制的预处理步骤。
An interactive volume rendering algorithm is presented which is based on a novel optical visualization model.
交互式体绘制算法基于一个新的可视化模型。
Hardware accelerated volume rendering technique is the key point of this thesis.
基于硬件加速的体绘制技术是本文的研究重点。
Several key techniques are described including the representation and classification of volume data, typical algorithms of surface rendering, volume rendering and hybrid rendering.
对体视化的几种关键技术进行了分类综述，介绍了体数据的表示和分类，面绘制、体绘制和混合绘制各类典型算法的原理和特点。
Methods in 13 cases, maxillofacial fractures were demonstrated with 3dct volume rendering.
方法对13例颌面复杂骨折患者，进行三维ct体积重建。
From now on, there are mainly two implementations of volume rendering, one is software implementation, the other is hardware implementation.
目前体绘制策略的实现主要有两种：软件实现和硬件实现。
To present the structure of three-dimensional magnetosphere, the method of visualization of three-dimensional magnetosphere with the technique of direct volume rendering was promoted.
为了准确表现三维磁层的结构，提出了一种用直接体渲染技术对三维磁层粒子进行可视化的方法。
Reconstruction methods were multiple planar reconstruction(MPR), maximum intensity projection(MIP) and volume rendering technique(VRT).
重建应用多平面重建（MPR），最大密度投影（M IP）及容积显示技术（VRT）。
In this work, we implement the traditional ray-casting-based volume rendering algorithm on the programmable graphics processing unit (GPU).
将传统的光线投射体绘制算法在具有可编程管线的图形处理器（GPU）上重新实现。
Method Before volume rendering we transfer each slice of volume into an array indexed by the value of voxels, element in which stores the position of each voxel.
方法在体绘制前，将每个体数据的每个层片编码成以体素值为序的有序数组。
And volume rendering of mixed data was processed.
从而对混合数据进行体绘制。
Volume rendering is also known as direct volume rendering, for no intermediate geometry primitives are generated during its visualization process.
由于体绘制技术是将三维的离散数据直接转换为二维图像而不必生成中间几何图元，所以又称为直接体绘制。
The significance of medical images volume rendering is the high quality results, so the hot point and the aim is strike the right balance of the rendering results and the rendering time.
医学图像体绘制的意义在于高质量的绘制效果，所以体绘制的研究热点及目的在于在绘制质量和绘制速度之间寻求较好的平衡点。
Volume rendering (VR) was applied to display and judge the images of the collateral vessels.
应用容积再现(VR)显示和判断病变侧支循环图像。
Results The three volume rendering of CT two - dimensional images of head has been realized.
结果用该方法实现了头部CT二维图像的三维体素成像。
Ray casting is a classic algorithm of Volume Rendering.
光线投射算法是体绘制中的经典方法。
Then, the paper talked about the volume rendering technology, using GPU on that area, and set out the operation effect of the visualization software.
随后文章介绍了体绘制技术与GPU技术在这方面的应用，并展示了编写的显示端软件的执行效果。
Volume rendering (VR), maximum intensity projection (MIP) and multiplanar reformation (MPR) were used to analyze intracranial vessels on the graphics workstation by two radiologists.
由两位放射医师分别在工作站上行常规与减影的容积再现（VR），最大密度投影（MIP）和多平面重组（MPR）方法分析颅内血管。
In this paper, three-dimensional seismic data field of direct volume rendering-Ray Casting Algorithm is mainly studied.
本文主要研究三维地震数据场的直接体绘制方法——光线投射算法。
Color composition is an important part in volume rendering, and its computation is very time-consuming.
颜色合成是体绘制的重要组成部分，其中大量重复计算严重影响了绘制的实时性。
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