Transforming clinical imaging and 3D data for virtual reality learning objects: HTML5 and mobile devices implementation

Web deployable anatomical simulations or “virtual reality learning objects” can easily be produced with QuickTime VR software, but their use for online and mobile learning is being limited by the declining support for web browser plug‐ins for personal computers and unavailability on popular mobile devices like Apple iPad and Android tablets. This article describes complementary methods for creating comparable, multiplatform VR learning objects in the new HTML5 standard format, circumventing platform‐specific limitations imposed by the QuickTime VR multimedia file format. Multiple types or “dimensions” of anatomical information can be embedded in such learning objects, supporting different kinds of online learning applications, including interactive atlases, examination questions, and complex, multi‐structure presentations. Such HTML5 VR learning objects are usable on new mobile devices that do not support QuickTime VR, as well as on personal computers. Furthermore, HTML5 VR learning objects can be embedded in “ebook” document files, supporting the development of new types of electronic textbooks on mobile devices that are increasingly popular and self‐adopted for mobile learning. Anat Sci Educ 6: 263–270. © 2012 American Association of Anatomists.     

基于二次成像指纹光学采集系统的设计

本文在查阅相关专利的基础上,模拟了二次成像非共轴光学采集系统,该系统可校正与光轴成倾斜物面所引起的畸变,可使仪器体积小,重量轻,成本低,便于批量生产。经过优化后,可使指纹采集系统的畸变控制在0.2%以内,满足指纹识别的要求。     

基于RD域分块的改进距离徙动成像算法

研究了二维频域成像算法,提出一种基于RD域分块的改进距离徙动成像算法,并将该算法与近似算法和一般逆变标算法进行了点阵目标仿真和运算效率比较.当测绘带较宽且距离徙动较大时,该算法聚焦性能优于近似算法和一般逆变标算法.通过比较还可看出该算法运算效率高于逆变标算法.最后用实测数据仿真验证了该算法是可行的.     

Through-wall radar imaging using UWB noise waveforms

This paper examines the results of our research on the use of ultrawideband noise waveforms for imaging objects behind walls. The advantages of using thermally generated noise as a probing signal are introduced. The technique of heterodyne correlation used to inject coherence in the random noise probing signal and to collapse the wideband reflected signal into a single frequency are presented. Central to successful imaging through building walls is the characterization of the wideband propagation properties of wall materials and these are discussed. The basic concepts of synthetic aperture radar image formation using noise waveforms and the unique problems associated with the random nature of the transmit waveform are analyzed. We also address issues related to locating, detection, and tracking humans behind walls, using new tools for human activity characterization, namely the Hilbert-Huang Transform approach. The results indicate that noise radar technology combined with modern signal processing approaches is indeed a viable technique for covert high-resolution imaging of obscured stationary and moving targets.     

Making Cognitive Neuroscience Educationally Relevant: Creating Bidirectional Collaborations Between Educational Psychology and Cognitive Neuroscience

Not only should educational psychologists keep abreast of developments in the rapidly evolving field of brain science, but also they should contribute their knowledge of higher cognitive functioning and instructional interventions to this field. Linking imaging studies with instructional studies may shed light on causal mechanisms in brain function. The importance and challenges of studying the brain at different levels of analysis are discussed and illustrated with examples from the reading literature and the deafness literature.     

评估普通人群肝脂肪变性磁共振成像定量方法的可行性

为了探讨采用3T西门子MRI LiverLab评估普通人群志愿者肝脏脂肪含量的可行性,招募了60名志愿者,其中双回波Dixon技术预测肝脂肪变性的患病率为51.7％(31/60),多回波Dixon和多回波HISTO技术测量的平均肝脏质子密度脂肪分数分别为(9.1±1.9)％和(9.3±2.3)％,测量结果在统计学上没有...     

基于波束形成原理的SAR三维成像算法

合成孔径雷达(SAR)三维成像能解决SAR二维成像中的叠掩、顶底倒置等几何失真问题,在军事侦察、灾害预测、资源调查和地形融合等领域具有广阔的应用前景.本文基于波束形成原理开展了SAR三维成像方法研究,通过在航迹向及跨航向上同时进行数字波束合成,实现对观测目标的三维分辨成像,分析了距离近似条件对三维成像处理的影响并验证其正确性,通过仿真实验数据验证了本文模型及算法的有效性及正确性.     

A K+-sensitive AND-gate dual-mode probe for simultaneous tumor imaging and malignancy identificationOA

Although molecular imaging probes have the potential to non-invasively diagnose a tumor,imaging probes that can detect a tumor and simultaneously identify tumor malignancy remain elusive.Here,we demonstrate a potassium ion(K+) sensitive dual-mode nanoprobe(KDMN) for non-invasive tumor imaging and malignancy identification,which operates via a cascaded ’AND’ logic gate controlled by inputs of magnetic resonance imaging(MRI) and fluorescence imaging(FI) signals.We encapsulate commercial K⁺     

高分辨率SAR子孔径图像相干性分析及其地物分类应用

针对相干性这一合成孔径雷达(SAR)图像分析常用的特征量进行分析,首先从理论上分析高分辨率SAR图像中人造目标和自然地物等典型目标的子孔径、子频带以及不同子孔径重轨干涉图像间的相干系数,然后利用高分辨率星载SAR实际数据开展上述相干系数的计算,验证分析的正确性。随后根据不同地物在不同维度相干系数上体现的不同特点,进行非监督地物分类,并给出不同类别所表征的地物特点。分析结果可为高分辨率SAR数据的优化应用提供支撑,并可加深对SAR不同地物目标特性的理解。     

Research on ultrasonic detection of complex surfaces

INTRODUCTION Parts of complex surfaces have found wide ap-plications today in airplane,ship,automobile industry,medical science,etc.How to detect the internal de-fects of parts of complex surfaces efficiently and ac-curately is an important issue.Due to its special ad-vantages of high sensitivity,good detection,strong penetration ability,and harmlessness to human body,ultrasonic detection has become a most important method of Nondestructive Test(NDT).However,at present in China,to detec…