Functional magnetic resonance imaging of amphetamine craving

The aim of this study is to identify the brain activity associated with amphetamine craving for understanding the neurobiology of addiction by watching pictures of happy, sad or amphetamine. Brain activity was measured in 12 amphetamine addicts and 12 healthy subjects by fMRI while the subjects watched pictures designed to elicit happy feelings, sad feelings, or the desire to use amphetamine. The result demonstrated that amphetamine cues led to abnormally high cingulate and low frontal lobe activation in amphetamine addicts, who showed abnormalities in affect-related brain activation.     

激光辐照Fe81.5P18.4Yb0.1非晶合金的晶化特征

本文用扫描电镜（ＳＥＭ）和示差扫描量热法（ＤＳＣ）研究了ＸｅＣｌ准分子激光辐照Ｆｅ＿（８１．５）Ｐ＿（１８．４）Ｙｂ＿（０．１）非晶合金的晶化特征。结果发现，辐照样品的断面上有类冲击波纹样的层状规则的晶粒分布，其晶粒尺寸由辐照表面向样品内部逐渐减小，最后是近纳米尺度的微晶排布，样品的热稳定性也明显改善。     

Radar Imaging Based on Iterative Algorithms

It has long been realized that the problem of radar imaging is a special case of image reconstruction in which the data are incomplete and noisy. In other fields, iterative reconstruction algorithms have been used successfully to improve the image quality. This paper studies the application of iterative algorithms in radar imaging. A discrete model is first derived, and the iterative algorithms are then adapted to radar imaging. Although such algorithms are usually time consuming, this paper shows that, if the algorithms are appropriately simplified, it is possible to realize them even in real time. The efficiency of iterative algorithms is shown through computer simulations.     

核磁共振技术在生物和医学上的应用

本文介绍了在生物和医学领域内应用核磁共振技术的历史，应用的主要方面，以及三种常用的自旋核，并指出了与传统的技术和ＣＴ成像相比，磁共振技术具有更多的优点．     

快速成型技术的典型方法比较

本文介绍了一种当今国内外最新制造技术—快速成型技术。对该技术的四种典型方法进行了较详细的分析和比较，并对快速成型技术的未来发展提出了自己的看法。     

红外焦平面探测器输出图像信噪比计算和分析

推导了红外焦平面探测器输出图像信噪比的一般计算公式 ,并针对红外焦平面探测器在地面面目标自动识别系统中的具体应用 ,计算了其在不同天气情况下的成像信噪比。由计算结果可知 :采用高性能的焦平面探测器后 ,红外成像的图像信噪比非常高 ,即使在较恶劣的天气 (大雾 )情况下也可获取质量较好的红外图像 ,满足自动目标识别系统图像处理的需求     

二维透视照片的三维全息图处理方法

提出一种二维透视照片合成三维全息图的方法．它利用人眼的视差及大脑本能功能,将普通相机对一物体在不同角度拍摄下的数张二维透明片,用激光全息的存贮编码方法进行组合记录,最后采用彩虹全息二步法进行第二次拍摄,可得到一张效果逼真且随观察角度的变化而变化的、具有动感的三维全息图．给出此方法的理论分析和实验结果．     

动态超声彩色血流图像的计算机仿真

计算机仿真超声彩色血流图像，可以为各种超声彩色血流图像处理方法的性能比较提供有效的信号源．在仿真某一时刻静态超声彩色血流图像的基础上，根据给定的一个心动周期的最大血流速度曲线，计算出血管内的血流速度分布随时间的变化，对一个心动周期划分24时相，仿真出动态超声彩色血流图像。     

SPM的数学基础及其在脑功能成像研究中的应用

探讨SPM的数学基础,给出了SPM中利用一般线性模型(General LinearModel,GLM)构建统计参数图的方法;为了适应处理功能磁共振成像(functionalMagnetic Resonance Imaging,fMR I)数据的需要,对一般线性模型做了扩展,推导出扩展的GLM的检验统计量和自由度.最后将扩展的一般线性模型应用于一个具体的fMR I实验,说明了方法的有效性.     

Diagnosis of prostate cancer by quantitative analysis of 3DMRSI data: A new model

Three-dimensional magnetic resonance spectroscopic imaging (3DMRSI) is helpful to identify prostate cancer (PC)from benign prostate hyperplasia (BPH) and to show the distribution of tumor infiltration. Combined with the (Cho + Cre)/Cit ratio, the z-score model can effectively discriminate prostate cancer from stromal benign prostate hyperplasia (sBPH) and detect small malignant lesions (SML).