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概述：PACS（PictureArchivingandCommunicationSystems）即图像归档与传输系统,是医院的医学图像信息管理系统,图像主要来源于医院的放射医疗设备（如X-CT、UFCT、MAI机以及PET等）。传统的放射科医生的诊断方式主要是根据由特定影像设备产生的胶片,凭借医生多年的诊断经验判断是否有病变及其具体情况。这种利用胶片的诊断和存储方式随着影像设备的不断更新换代已经越来越不适应医院的管理发展需要。随着计算机技术的飞速发展,使用计算机取代胶片保存手段应用于医院管理的想法已产生了,PACS正是这种思想发展的结果。PACS… 相似文献
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目的：探索在医用胶片上对肋软骨CT影像显示其真实大小的胶片打印技术。方法：选取31例患者肋软骨CT影像资料，经影像后处理，胶片采用14英寸×17英寸（35 cm×43 cm）规格，计算EBW工作站显示屏主影像显示区和14×17胶片上实际影像显示区之间的比例关系，制成10 cm和5 cm两个长度规格的实物比例尺。打印时将胶片以2×2分格呈4幅图像布局，选取5 cm实物比例尺打印单根肋软骨横轴面或矢状面影像；以1×1分格呈单幅图像布局，选取10 cm实物比例尺打印全部前肋弓（含肋软骨）的三维影像。选取右侧第6肋软骨升部、横部的长度，升部横部连接处宽度、厚度，肋软骨胸骨端、肋软骨肋骨端的厚度等6个指标的胶片测量值和手术中实体测量值进行比较，并做统计学分析。结果：(1)对已打印的胶片进行测量，胶片上所示10 cm和5 cm比例尺与直尺的实际尺寸相等；(2)胶片上肋软骨影像的6组测量值和手术中的肋软骨实体测值对比，测量值差异无统计学意义。结论：基于DICOM协议下的打印技术可以实现肋软骨CT影像在胶片上的真实大小打印，术者从胶片中所获取的目标组织的形态数据可靠。 相似文献
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数字化地电观测数据中干扰的处理方法 总被引：1，自引：1，他引：1
随着地震观测技术的不断进步，地震前兆观测仪器数字化已是大势所趋。近年来，安徽省在3个台安装了数字地电仪，在2个台安装了数字水氡仪。数字化仪器的优点是可以更客观地记录地震前兆的真实信息，当然也包括干扰信息。可以按地震监测和科研需要设定数据采集时间间隔，模拟仪器有时难以做到。数字化仪器的自动化和智能化程度高，可以大大减轻观测人员的工作量。 同时，数字化资料便于网络传输，便于计算机信息处理。不但节省人力物力，而且也减少了中间环节出错的机会。然而，数字化仪器获取的数据也出现了原模拟仪器资料不曾出现的问题。… 相似文献
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本文针对数字影像设备（如CT、MRI等）日益突出的图像存储和管理问题，进行深入的分析和研究。鉴于不同厂家和时期设备配置不同，提出了4种切实可行的解决方案：胶片扫描，视频采集，光盘或MOD输入，DICOM接口连接，完全解决了图像长期大量存储的问题。同时具有网络联机查询，图文报告，电子病历管理，激光相机接口等丰富的增值功能，是数字化医院的理想选择。 相似文献
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"九五"数字化地震前兆台站整体接入因特网的研究 总被引：1，自引：0，他引：1
介绍了如何将"九五"数字化前兆台站设备整体接人因特网,提供了一种非常简便、实用的整体接人方案.台站原来的构成模式没有改变,台网中心和台站熟悉的原工作方式得到了保留,实现了台站网络化的目标,使现有台网在因特网环境下能够正常运行.它能够与"十五"新建的前兆台网进行集成,便于整个台网的统一管理. 相似文献
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电离层垂直探测方法获得的频高图是电离层观测中历史最为悠久的资料,利用现代微电子和计算机技术对大量历史胶片频高图的数字化转换、分析和保存,已成为拯救保护和利用这些珍贵历史资料的十分紧迫和重要的工作.本文采用数字和图像处理等技术对胶片频高图像进行数字化、校正、修复和格式转换,并开发出胶片频高图分析与转换程序,结合常用的SAO Explorer软件对武汉地区的胶片频高图进行了实例的分析.结果表明,该方法具有较好的可靠性和通用性,对大量历史频高图的数字化转换和分析具有实用性. 相似文献
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通过对高台台站地震前兆数字化系统通信故障的检查与处理。从地震前兆数字化系统的组成部分及接口界面，阐述了地震前兆数字化公用设备的一些常见故障的检查及处理。地震前兆仪器通过现场总线与DSC-2型数据采集器连接，通过有线，无线调制解调器入网后实现地震前兆台网对数据的收集。 相似文献
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数字化地震仪停记自动检测报警的实现方法 总被引：1，自引：0，他引：1
介绍了一种用软件方法实现数字化地震仪停记自检报警的编程思路、软件功能和操作步骤，以及相应的硬件配套设备，该软件能在数字化地震仪停记后20秒钟之内报警。 相似文献
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在地震这种重大自然灾害面前,快速有效地从遥感影像中提取震区土地利用信息,在灾情评估及灾后重建中发挥着重要作用。选取四川省芦山地震灾区无人机影像为数据源,运用面向对象的影像分析方法,首先研究了多尺度分割中参数的选择,获取了研究区最优分割参数;然后考虑了各个"影像对象"的数字化特征值,利用改进的SEaTH算法进行特征值优化处理;最后采用了隶属度信息提取方法,获得了芦山地震灾区无人机低空遥感影像分类图,并进行了分类精度评估,结果表明:研究区影像的分类总精度为87.5%,kappa系数为0.835。 相似文献
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月球影像数据是研究月球的地貌、地表形态，绘制全月地形图以及进行各种相关科学研究的基础.早期的Lunar orbiter，Apollo，Surveyor基本是以模拟影像格式传回地球，经过扫描后以照片形式发布.Clementine 的数据是通过PDS中心，以PDS的形式发布的.影像数据的保存与发布格式应遵循以下原则：数据格式要便于经常更新和补充；能够在各种平台和各不同目的使用人群中方便地使用；要符合国际标准，方便处理，能够与以前多次探测计划得到的数据结合使用.为中国嫦娥工程的影像数据格式提出建议. 相似文献
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《国际泥沙研究》2014,(4)
正Director:Shangfu Kuang,China Vice-directors:Chunhong Hu,China Duihu Ning,China Guangquan Liu,China The International Research and Training Center on Erosion and Sedimentation(IRTCES)was jointly set up by the Government of China and UNESCO on July 21,1984.It aims at the promotion of international exchange of knowledge and cooperation in the studies of erosion and 相似文献
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《中国科学:地球科学(英文版)》2014,(3)
正SCIENCE CHINA Earth Sciences,an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China,and published by Science China Press and Springer,is committed to publishing high-quality,original results in both basic and applied research. 相似文献
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Richard D. Hey 《地球表面变化过程与地形》1979,4(1):59-72
Feedback mechanisms, which operate upstream through drawdown and backwater effects and downstream through sediment discharge are responsible for channel evolution. By combining these mechanisms with channel processes it euables a dynamic process-response model to be developed to simulate the initial evolution of straight gravel-bed channels. When erosion commences on a land surface, sediment entrained in the headwater reach by hydraulic action is selectively transported, deposited and reworked. This produces a damped oscillation between degradation and aggradation as the channel and valley respond to spatial and temporal variations in sediment calibre and hydraulic conditions. The initial cut and fill phases are responsible for valley incision and floodplain development while secondary and subsequent activity can produce river terraces. Eventually sediment entrainment in the headwaters declines as slopes are reduced. Subsequent channel evolution is relatively insignificant because it is dependent on local weathering activity producing material that can be transported on declining slopes. Therefore landforms produced during the initial phase of development, when local weathering was non-limiting, dominate the landscape. 相似文献
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Based on relocating the Jiujiang-Ruichang earthquake sequence which occurred on November 26, 2005 in Jiangxi Province with the double-difference （DD） algorithm and master event technique, the paper discusses the focal mechanism of the main shock （MsS.7） and the probable seismo-tectonics. The precise relocation results indicate that the average horizontal error is 0.31kin in a EW direction and 0.40kin in a NS direction, and the average depth error is 0.48kin. The focal depths vary from 8kin to 14kin, with the predominant distribution at 10kin - 12kin. The epicenter of the main shock is relocated to be 29.69^oN, 115.74^oE and the focal depth is about 10.Skin. Combining the predominant distribution of the earthquake sequence, the focal mechanism of the main shock and the tectonic conditions of N-E- and NW-strike faults growth in the seismic region, we infer that the main shock of the earthquake sequence was caused by a NW striking buried fault in the Rnichang basin. The nature of seismic faults needs to be further explored. 相似文献
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《水文科学杂志》2013,58(6)
Abstract The western reservoirs represent the principal groundwater system in Morocco. Demographic, industrial and agricultural developments during the last decade have markedly altered groundwater quality. The Mamora coastal aquifer system is among the Atlantic systems which are most heavily threatened by pollution. Agricultural and industrial activities, and rapid urban growth contribute to the pollution of the groundwater. Contamination transport is facilitated by a high permeability of the aquifer formations. In order to assess the actual groundwater quality of the Mamora aquifer and to understand the influence of the factors generating the pollution, an extensive multidisciplinary research programme is in progress, with hydrochemistry and microbiology playing essential roles. The present paper concerns the spatial distribution of physico-chemical parameters in the groundwater, subjected to domestic, industrial and agricultural pollution. Fifty-seven samples were analysed for several parameters (Ca2+, Mg2+, Na+, K+, Cl?, SO4 2?, HCO3 ?, NO3 ?, pH, electrical conductivity and temperature). The microbiological analysis of 143 samples reveals the presence of four kinds of indicator bacteria in the groundwater resources: faecal Streptococci, faecal coliform, Escherichia coli and Clostridium. The physico-chemical results and bacteriological monitoring show that the nitrate and bacteria concentrations exceed the maximum admissible levels, notably around pumping stations in the sectors of Sidi Taibi, Sidi Ahmed Taleb and Aïn Sbaâ. Contamination is generated by uncontrolled anthropogenic activities and accentuated by the high intrinsic vulnerability of the aquifer system. Several parameters appeared to exceed admissibility standards. Measures are recommended to prevent groundwater pollution in the region. 相似文献
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《中国科学:地球科学(英文版)》2014,(12)
正SCIENCE CHINA Earth Sciences,an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China,and published by Science China Press and Springer,is committed to publishing high-quality,original results in both basic and applied research. 相似文献