共查询到20条相似文献,搜索用时 421 毫秒
1.
本文首先介绍了西北大学可视化研究所研制的三维医学可视化分析系统。在此基础上,系统被用于医学影象数据库、虚拟内窥镜技术、远程会诊系统和计算机医学辅助教学系统的开发平台,为医学图象可视化提供了有力的工具. 相似文献
2.
针对心内复杂结构,本文结合三维虚拟内窥镜技术和二维常规观测截面功能,开发了双源CT心脏图像的显示系统。用户可以在本系统内以自动和交互式的两种方式观测心内结构。自动方式,对造影剂增强的数据部分进行基于欧式距离的三维骨架化得到规划路径,光线投射法根据已算出的欧式跳过空白区域,减少了绘制计算量;交互方式,用户可以随时从内窥镜视角切换到当前视点所在的任意截面,便于进行二维和三维的结构和病理综合分析。而且,本系统根据规划路径自动检测标准四腔切面,改善临床检查的效率。本系统采用基于CUDA的体绘制技术有效实现了对心内解剖结构更加直观的观测,便于心脏疾病的诊断和治疗。 相似文献
3.
多层螺旋CT后处理技术对气管支气管异物的诊断价值 总被引:1,自引:0,他引:1
目的:评价多层螺旋CT三维重建及仿真内窥镜技术对气管支气管异物的诊断价值。方法:对20例支气管异物、1例气管异物、1例先天性气管性支气管发育异常、1例气管良性肿瘤患儿行多层螺旋CT检查并进行三维重建及仿真内窥镜技术显示气管支气管病变;三维重建技术包括多平面重建、最大密度投影、最小密度投影、表面遮盖显示和容积再现,CT仿真内窥镜对气管支气管异物的显示与支气管镜所见具有一致性。结果:多层螺旋CT三维重建及仿真内窥镜可准确、直观地显示气管支气管异物的位置、大小、形态、密度及阻塞程度。结论:多层螺旋CT三维重建及仿真内窥镜可准确评价气管支气管异物,是一种准确无创性诊断方法,为临床治疗提供直观的影像学资料,具有较高的临床诊断及指导价值。 相似文献
4.
CT胃仿真内窥镜成像技术临床应用的探讨 总被引:2,自引:0,他引:2
目的:探讨CT胃仿真内窥镜成像技术的原理,方法,临床应用材料与方法:将螺旋CT容积扫描数据传输到工作站,通过软件功能重建出沿空腔器官中轴行程一致的多幅器官内表面图像,再用电影功能一次回放,获得仿真内窥镜效果用此方法检查10例及正常人其中胃部疾病患者5例.全部病例均经胃纤维内窥镜及手术病例证实结果:胃仿真内窥镜获得类似纤维内窥镜显示空腔器官腔壁或腔内病变形态的效果结论:CT胃仿真内窥镜提供了一种无创伤性的诊断方法,可作为纤维内窥镜的补充手段. 相似文献
5.
6.
闾国年 《中国科学:地球科学》2011,(4):549-561
针对目前虚拟地理环境侧重表达、忽略地理分析的现状,从现代地理学研究与发展前沿需求出发,探讨了可支撑地理分析与模拟的虚拟地理环境的框架、结构与功能.围绕虚拟地理环境的构建理论和实现技术,分析了面向地理分析的虚拟地理环境的建设目标,构建了虚拟地理环境整体框架;将虚拟地理环境分为数据环境、建模环境、表达环境与协同环境四个子环境,深入解析了各子环境的功能、关键技术与研究思路,为虚拟地理环境进一步发展及虚拟地理环境平台研制与开发提供参考. 相似文献
7.
描述了利用Internet将海南、广东数字地震台网连接,组建虚拟地震台网的技术途径,比较了海南本地台网和虚拟台网地震监控能力及海南虚拟台网应用效果。结果表明,联网后,扩展了对两省交界海域的监控范围,提高了定位精度,有利于地震速报和地球物理研究。 相似文献
8.
研究并提出了利用虚拟仿真技术实现城市震害预测结果展示的技术方法和思路,描述了城市震害预测虚拟仿真系统需求、功能设计及结构框架。为震害预测更好服务于城市减灾、服务于民众防灾避险意识的提升等提供有效的技术支撑,具有较好的应用前景。 相似文献
9.
10.
11.
12.
M. N. French R. L. Bras W. F. Krajewski 《Stochastic Environmental Research and Risk Assessment (SERRA)》1992,6(1):27-45
A procedure for short-term rainfall forecasting in real-time is developed and a study of the role of sampling on forecast ability is conducted. Ground level rainfall fields are forecasted using a stochastic space-time rainfall model in state-space form. Updating of the rainfall field in real-time is accomplished using a distributed parameter Kalman filter to optimally combine measurement information and forecast model estimates. The influence of sampling density on forecast accuracy is evaluated using a series of a simulated rainfall events generated with the same stochastic rainfall model. Sampling was conducted at five different network spatial densities. The results quantify the influence of sampling network density on real-time rainfall field forecasting. Statistical analyses of the rainfall field residuals illustrate improvement in one hour lead time forecasts at higher measurement densities. 相似文献
14.
《地震工程与工程振动(英文版)》2014,(4)
正This journal is established by the Institute of Engineering Mechanics(IEM),China Earthquake Administration,to promote scientific exchange between Chinese and foreign scientists and engineers so as to improve the theory and practice of earthquake hazards mitigation,preparedness,and recovery.To accomplish this purpose,the journal aims to attract a balanced number of papers between Chinese and 相似文献
15.
George W. Housner 《地震工程与工程振动(英文版)》2008,7(2):I0001-I0001
Destructive earthquakes have caused great damage in China and the United States and collapsing buildings havecaused many deaths and injuries. The field of earthquake engineering studies earthquake hazards, the occurrence ofearthquakes of various magnitudes, the nature of the ground shaking during an earthquake, the vibration of structuresduring earthquakes, the strengthening of existing structures and the design of new structures to be earthquake resistant,and finally, how to cope with earthquake damage and restore a city to normal functioning. Such efforts are in progressin both countries, but unfortunately, the language barrier interferes with the free flow of information between China andthe Untied States. It would be mutually beneficial if some means could be developed to promote the exchangeof information across the Pacific Ocean. This new journal has been established for this purpose and its success willbe an important step in promoting earthquake engineering in China and the United States. 相似文献
16.
《国际泥沙研究》2014,(4)
正President:Giampaolo Di Silvio,Italy Vice Presidents:Ulrich C.E.Zanke,Germany Zhao-yin Wang,China The World Association for Sedimentation and Erosion Research(WASER),inaugurated on Oct.19,2004,is an independent non-governmental,non-profit organization.The mission of WASER is to promote international co-operation on the study 相似文献
19.
JianCheng Shi 《中国科学:地球科学(英文版)》2014,57(10):2281-2282
正Global Change includes climate change and other environmental changes caused by the joint interaction among various layers of Earth. From the positive side, global change provides new opportunities to human and other living forms on Earth. In the meantime, it creates tremendous challenges and negative impact. At present, the negative impacts have reached all primary processes of the global ecosystem and every aspect of human society, especially causing degradation of the ecosystem. For instance, intensive deforestation causes decline of biodiversity; global warming causes sea level rise and increases 相似文献