重建

The algorithm is applied in the segmentation of Magnetic Resonance Imaging of human brain for the 3D reconstruction on dependent of different human tissue structures, in which the problem on wraps between different tissues and fuzzy edges between the different regions in medical volume data may better be settled, which can not be well done by the typical"hard"segmentation using binary logical representation.(3) An accelerated algorithm of volume rendering with X-ray perspective and Phong shading effect based on textures mapping and blending is presented for realizing 3D reconstruction of medical volume data by 2D texture mapping and blending, in which the accelerated algorithm of window transformation is utilized to computing voxels' gray scales and opacities to produce X-ray perspective images, and Phone illumination model is used to import world light sources and an unit spherical surface under the same shading environment as the actual volume rendering is employed to simulate the real reflectional light of per-voxel so that 3D reconstruction possesses illumination effect in the world. Furthermore, 3D matrix transformations of degree rotation and other operations of 3D object are studied, and a fast equivalent method of corresponding shading correction is brought forward to improve its interaction speed in volume rendering process.

该方法利用体数据的窗口变换加速算法将医学体数据转换为计算机显示值，可以得到具有X光透视效果三维图像；该方法提出的Phong明暗处理加速算法利用Phong光照模型引入外部光源，使用一单位球面体来仿真体数据的法线矢量集所产生的反射光强，以快速得到每一个体素的反射光强度，使物体的三维重建达到现实世界中人眼直接观察的逼真效果；此外，还研究了三维重建物体的三维旋转等矩阵变换，提出了一种Phong明暗修正的快速算法来保证了体绘制中三维几何变换的多视角观察的交互速度。

The regurgitant volume was calculated by temporally integrating the instantaneous flow volume rate of each frame during systole.

建立了基于经食道旋转扫描二维和经胸实时三维超声多普勒血流图像获取方法和图像插值、配准算法获得体数据，经多维重建描述二尖瓣反流速度的空间分布，立体观察返流的时相、方向、反流束长度、面积、体积、空间传播和严重程度等；通过重建反流后的速度场，从血流动力学角度分析了二尖瓣反流的性质，计算偏心反流束的湍流强度，利用反流束角度和湍流强度对计算结果进行修正；基于实时三维彩色多普勒成像技术，利用控制体原理对二尖瓣反流束在反流瓣口横断面的速度分布进行空间与时间积分获得二尖瓣偏心性反流的每搏反流量。

The aim of the "surge" is to restore order in Iraq—and, by restoring order, reinject a little life into the project of democratising the Middle East.

&军队涌入&伊拉克的目的在于重建秩序——而且通过重建秩序，能够为中东的民主推广工程再注入一丝活力。

Experimental results show that the proposed sequence subsets SART can provide higher quality reconstructed images that are very insensitive to noise at a small number of iterations.

实验结果表明序列子集联合代数重建技术可在少数次迭代后提供较高质量的重建图像，且对噪声数据不敏感。

In this paper, we develop a new algorithm called the sequence subsets SART, which decrease the number of subsets after each iteration. Thus we not only accelerate convergence of the reconstructed image but also recover various frequency components of the reconstructed image in early iterative steps.

本文提出序列子集联合代数重建技术，在每次迭代后减少使用的子集个数，这样在加速图像收敛的同时恢复重建图像的各种频率元素。

Objective To introduce the rehabilitation methods after reconstruction of anterior cruciate ligament with quadru-pled-stranded semitendinosus tendon and suture plate.

目的：介绍采用四股半腱肌肌腱和缝线钢板重建前十字韧带后的康复训练方法，总结某近期效果。方法：对51例陈旧性前十字韧带损伤的患者采用四股半腱肌肌腱和缝线钢板进行重建，术后进行1年以上系统的康复指导。

Methods The CF iterative algorithm was applied to update the noisy detected emission sinogram data using the latest reconstructed image in the iterative process of PET reconstruction.

在PET重建的迭代过程中，此种负反馈迭代算法利用最近的一次重建图像来更新有噪声的探测到的发射正弦图数据。

Objective To uate the clinical application value of multi-slice CT MPR and VR technique in lumber spondyloschisis diagnosis.

目的 探讨MSCT多平面重建和容积重建技术在诊断腰椎峡部裂中的应用价值。

Results: MPR together with axial images could well display the entire picture of spondyloschisis and spinalcanal.

结果 多平面重建矢状面图像和轴位对18例31处椎弓崩裂均显示良好，轴位对裂隙骨赘、骨痂、纤维组织增生，椎间盘病变等征象显示清晰，正中矢状面重建对椎体滑脱，椎体撕裂或骨赘后突显示良好。

Results: MPR together with axial images could well display the entire picture of spondyloschisis and spinalcanal. Conclusion: Spiral CT together with MPR plays an important role in detecting spondyloschisis.

结果 多平面重建矢状面图像和轴位对18例31处椎弓崩裂均显示良好，轴位对裂隙骨赘、骨痂、纤维组织增生，椎间盘病变等征象显示清晰，正中矢状面重建对椎体滑脱，椎体撕裂或骨赘后突显示良好。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。