关于筹建CT博物馆的倡议

Ｘ线ＣＴ，自１９７０年问世以来，迄今已发展到第五代，成为临床诊断不可缺少的重要设备之一。据初步统计，仅在山东省就有各种类型的Ｘ线ＣＴ机３００余台；在中国大陆拥有４０００台Ｘ－ＣＴ机，并已安置多层螺旋ＣＴ机和电子束ＣＴ机若干台。 泰山医学院早在１９８３年即被国家卫生部确定为全国放射技师培训基地，１９８５年设置放射技术专业，不久开始招收医学影像专业本科生，１９９３年在泰山医学院召开了第七届全国ＣＴ理论与应用学术交流会：１９９６年该专业被评为省重点学科，稍后成为医学影像专业硕士生培养点。鉴于泰山医学院…     

颅颌面外科与三维重建技术

目的 探讨电子束ＣＴ三维重建技术在颅颌面外科的适应症和应用价值。方法 采用美国Ｉｍａｔｒｏｎ公司的电子束ＣＴ（ｅｌｅｃｔｒｏｎ ｂｅａｍ ＣＴ,以下简称ＥＢＣＴ）Ｃ－１５０,对７６例严重颅颌面病人实行薄层ＣＴ容积扫描。将所获ＣＴ 象经数字接口传至加拿大ＩＳＧ公司生产的Ａｌｌｅｇｒｏ工作站进行三维重建。结果 ＥＢＣＴ成像技术能立体的、详尽和精确的显示机体组织三维解剖结构极其相互关系。其再现畸形或病体     

首届国际CT和体视科技创新与应用高层论坛邀请函

由中国体视学学会主办的“首届ＣＴ和三维成像国际学术会议”将于２０００年１０月４－８日在北京隆重召开。特在会议期间开设“首届国际ＣＴ和体视科技创新与应用高层论坛”．由ＣＴ和三维成像国际学术会议组委会同“中华英才半月刊”信息中心联合主办：１主题和宗旨：ＣＴ和体视科技为社会服务及其展望;在工业、建筑业、电子医疗方面和地球浅层ＣＴ的科技创新与应用实践,推动ＣＴ科技更好地为发展生产力、为社会服务。２论坛议题：１）医疗ＣＴ：ＣＴ、体视和激光显微成像科技与电子医疗设备和诊断的应用：保健治疗,能及时消除隐患,更…     

PACS-RIS系统在医学影像学教学科研模块管理中的应用

目的和意义:依托医院PACS安装和实施的契机,充分利用医院的病例特点和中医诊疗优势,通过结合中医辨证论治的要求对医学影像和信息进行计算机智能化处理后,达到摒弃影像诊断传统的肉眼观察和主观判断的目的。借助计算机技术,对影像的像素点进行分析、计算和处理,以得到相关的完整数据,为医学影像诊断提供更客观的信息的同时建立相关不同疾病分类的教学模块,填补国内在中医药大学医学影像学教学和科研计算机评价体系方面的空白,为临床、科研和教学工作提供了更可靠的工具。     

研制礅血管疾病MRI,CT影像的计算机分析诊断系统与应用

目的是建立一套ＣＴ、ＭＲＩ影像的计算机辅助分析诊断系统,使具有医学基础知识和懂得简单ＣＴ、ＭＲＩ影像术语的医生能对脑血管疾病做快速确诊,并可作为影像教学系统。材料与方法为：本系统图片和资深放射医生来源于山西医科大学第一附属医院ＣＴ室和其他有关方面。分析方法为序贯诊断法,程序设计以Ｗｉｎｄｏｗ３２为平台,Ｖｉｓｕａｌ Ｆｏｘ Ｐｒｏ３．０为开发语言。结果得到：该系统实现了分别由２９种ＣＴ、２３种ＭＲ     

CTM－DI磁力仪通过国家自然科学基金委员会鉴定

ＣＴＭ－ＤＩ磁力仪通过国家自然科学基金委员会鉴定由中国科学院地球物理研究所研制的ＣＴＭ－ＤＩ磁力仪，１９９３年１２月１０日，在国家自然科学基金委员会主持下，通过了由学部委员秦馨菱等专家组成的鉴定委员会的鉴定。该委员会在鉴定意见中一致认为：ＣＴＭ－ＤＩ...     

用超速CT机检测99例无症状香港中国人降低钙指数

回顾分析Ｍａｔｉｌｄａ医院超速ＣＴ室筛选首批病人中９９例中国人资料，很明显从通常采用１３０－１００Ｈｏｕｎｓｆｉｅｌｄ单位作为检出冠状血管钙化的基数应用至中国人身上其阈值数目需要降低，同时，我们也发现如果病人年龄按每１０年范围分组（２１－３０，３０－４０，４１－５０，５１－６０）而计算其超速ＣＴ的钙化指数会较随机男女一起按平均计算更易区分其差异．进一步分析显示，男性中年时候超速ＣＴ指数已达最高值，而女性则晚１０年方达最高值，因此，为了更易探测冠脉循环内钙化倾向应作出超速ＣＴ检出钙化的指数数目．这些实践经验对动脉粥样硬化过程的预测或预防有实际意义．     

高等医学院校教材《医学影像技术学》出版发行

由王骏、赵海涛、张益兰、黄小华主编的高等医学院校教材《医学影像技术学》由人民军医出版社出版发行（ISBN：978-7-5091-4967-6）。该书涵盖了医学影像技术学的成像原理、图像信息、影像药物、检查技术、质量控制、安全防护等28个篇章,约100万字、640页,是近20所高等医学院校从事医学影像技术医疗、教学、科研...     

西门子公司AR·C断面扫描系统和IMPACT－磁共振成像系统在煤炭部总医院应用的经验

西门子公司ＡＲ·Ｃ断面扫描系统和ＩＭＰＡＣＴ－磁共振成像系统在煤炭部总医院应用的经验煤炭部总医院影像科，１０００２８数字形像设备的配置和应用情况，已成为衡量现代化医院的重要标准．而Ｘ线计算机断面扫描系统和磁共振成像系统，又是最重要的两大数字影像设备．...     

颅脑外伤手术前后CT影像分析

对比颅脑外本文收集颅脑外患者患者１００例,大部分在伤后１小时九小时内作ＣＴ扫描目的是提高地颅 外伤手术前后ＣＴ表现变化的认识,使病人得到及时有效治疗。材料和方法：收集颅脑外伤手术患者１０６例,伤后１小时至１３天作ＣＴ检查,大部分在外伤后娄一部例在手术后１０天内ＣＴＴ昨查１次以上。均采用颅骨钻引流或去骨瓣减压术。将手术前后ＣＴ表现进行对比影像分析。结果：单纯硬膜外血肿,术后出现脑挫裂伤较少,且程度较     

固城湖晚全新世以来的孢粉组合及环境变迁

本文依据固城湖GD钻孔系统的孢粉分析资料,将井深6.3m岩心所做的孢粉图式,结合~(14)C测年,从下面上分为8个孢粉组合带,进而论述了4000年来该区的植被发展和气候的4次冷暖交替的变化。4次冷期约为3.0—2.5KaB.P.2.0—1.5KaB.P.、1.0—0.8KaB.P.和0.4Ka以来。此外,还根据沉积物中的硅藻分析、有机质δ~(13)C值、有机碳含量及历史记载等资料,侧重讨论了气候及人类活动对湖泊环境演变的影响。     

耦合地震动下地铁车站的动力响应研究

耦合地震动对地铁车站结构的响应较为复杂,本文运用有限单元法进行动力时程分析,研究地铁车站结构承受水平、竖向和双向耦合地震动作用下的动力响应规律.结果表明:(1)耦合地震动对结构相对水平位移影响较小,但对结构的相对竖向位移影响较大.(2)耦合地震动会减小中柱主应力值,但并未较大程度上改变中柱主应力值大小分布情况.(3)车...     

The influence of ground ice distribution on geomorphic dynamics since the Little Ice Age in proglacial areas of two cirque glacier systems

Holocene glaciers have contributed to an abundance of unstable sediments in mountainous environments. In permafrost environments, these sediments can contain ground ice and are subject to rapid geomorphic activity and evolution under condition of a warming climate. To understand the influence of ground ice distribution on this activity since the Little Ice Age (LIA), we have investigated the Pierre Ronde and Rognes proglacial areas, two cirque glacier systems located in the periglacial belt of the Mont Blanc massif. For the first time, electrical resistivity tomography, temperature data loggers and differential global positioning systems (dGPS) are combined with historical documents and glaciological data analysis to produce a complete study of evolution in time and space of these small landsystems since the LIA. This approach allows to explain spatial heterogeneity of current internal structure and dynamics. The studied sites are a complex assemblage of debris‐covered glacier, ice‐rich frozen debris and unfrozen debris. Ground ice distribution is related to former glacier thermal regime, isolating effect of debris cover, water supply to specific zones, and topography. In relation with this internal structure, present dynamics are dominated by rapid ice melt in the debris‐covered upper slopes, slow creep processes in marginal glacigenic rock glaciers, and weak, superficial reworking in deglaciated moraines. Since the LIA, geomorphic activity is mainly spatially restricted within the proglacial areas. Sediment exportation has occurred in a limited part of the former Rognes Glacier and through water pocket outburst flood and debris flows in Pierre Ronde. Both sites contributed little sediment supply to the downslope geomorphic system, rather by episodic events than by constant supply. In that way, during Holocene and even in a paraglacial context as the recent deglaciation, proglacial areas of cirque glaciers act mostly as sediment sinks, when active geomorphic processes are unable to evacuate sediment downslope, especially because of the slope angle weakness. Copyright © 2014 John Wiley & Sons, Ltd.     

武汉东湖铜锈环棱螺的种群动态及次级生产力

1999年6月至2000年5月对武汉东湖铜锈环棱螺的种群生态学进行了周年研究.铜锈环棱螺年均密度和生物量分别为92.2ind./m2和142.83g/m2,密度和生物量的高峰分别出现在6月(157ind./m2)和11月(20578g/m2);东湖铜锈环棱螺为一年一代,其一年中种群含有5个年龄组,其中1998年龄组占绝对优势.利用瞬时增长率法计算东湖铜锈环棱螺的周年生产量带壳湿重为91.56g/m2,去壳干重为5.32g/m2,P/B系数为0.64.同时研究了铜锈环棱螺的生产力动态变化,其生产量累积多数季节均有发生,且以1998年龄组占优.     

The upper and middle crustal velocity structure of the northern part of Hebei plain inferred from short period surface wave dispersion

IntroductionThenorthernpartofNorthChinaplainisoneofthemajorregionsforearthquakemonitoringandprediction.AlotofdeepstructureinvestigationhasbeencarriedolltinBeding,Tianjin,TangshanandZhangiiakouinthepastyears,andalotofimportantresultshavebeenachievedby...     

“长江深断裂带”的构造性质:深地震反射证据

长江深断裂带自20世纪50年代提出以来,因其在区域控岩、控矿、工程地质和灾害地质研究中的重要意义,一直受到广泛关注和研究,但由于缺乏深部资料,对长江深断裂带的构造性质、空间展布众说纷纭.本文通过分析穿过长江河床及两岸的六条深地震反射剖面,讨论了长江中下游成矿带及长江深断裂带的构造性质及演化,获得如下认识:(1)长江中下游成矿带是燕山期的陆内俯冲带,上地壳发生强烈挤压变形,以大型逆冲、叠瓦、褶皱和推覆构造为特征;下地壳及岩石圈地幔俯冲或叠置到相邻块体之下,在宁芜火山岩盆地和沿江凹陷下形成了"鳄鱼嘴"构造.(2)白垩纪以来,长江深断裂带(CJF)由一系列拆离断层组成,大致沿长江河床分布.该断裂带在燕山期陆内造山阶段为一组逆冲断裂,伸展垮塌阶段反转为正断层或拆离断层,同时控制了沿江凹陷的形成和演化.(3)陆内俯冲或叠置导致地壳加厚、拆沉,引发大规模岩浆活动."鳄鱼嘴"构造或是沟通深部岩浆向上迁移的主要通道,控制了沿江成矿岩浆岩的分布.正是这种特殊的深部过程和构造特征,导致了燕山期长江中下游地区的大规模成岩、成矿作用.     

Research on nonlinear R/S method and its application in earthquake prediction

4 Conclusions The preliminary result of this work was obtained in 1992. At Consulting Meeting for Seismic Trends of China in Jan. 1993, we handed in a report and predicted that “Until now, the average magnitude curve haven’t gotten risen again after a fall, and the value ofH is under 0.4, so no alarm is made by each of these two. We predicted that, seismicity of the Chinese mainland in 1993 may be at the same level as in 1991–1992, or a little higher than it, but mustn’t be very high; this is to say that no earthquake withM _s⩾7.2 will occur in the Chinese mainland in 1993.” The real situation is: No earthquake withM _s⩾7.2 occurred in the Chinese mainland, and it shows that this real prediction is true. To state succinctly: (1)In ths paper nonlinearR/S fractal method is applicated in earthquake prediction, and two algorithms RSH and RSHM are proposed. (2)R values of this two algorithms reached a notable value, and pass confidence test, so a certain efficiency is presented. But RSHM is some better. (3) It is presented by the successful prediction example that there is a good prospect in predicting with fractal method. Contribution No. 95A0056, Institute of Geophysics, SSB, China. This study is supported by the Chinese Joint Seismological Science Foundation.     

Mineral age patterns in ca. 3700 my old rocks from West Greenland

KAr,⁴⁰Ar³⁹Ar and RbSr dates are reported for minerals from the ca. 3700 my-old Amîtsoq and Isua gneisses of the Godthaabsfjord area of West Greenland. KAr dates on biotites and hornblendes range from about 1900 to 3500 my, with hornblendes having a much narrower range (ca. 2250–2750 my) than biotites. One biotite from Isua gives an impossibly high KAr date of 4940 my.⁴⁰Ar³⁹Ar mineral dates are in close agreement with conventional KAr dates over the entire range of apparent age values. The presence of minor amounts of excess argon is observed in the hornblendes, but radiogenic and excess argon in the biotites are completely homogenised and cannot be differentiated.Rb-Sr measurements on biotites are closely concordant and show that all biotites were completely open to diffusion of radiogenic⁸⁷Sr at about 1600–1700 my. This is the first proof of a regional thermal event at this time in the Archaean of West Greenland, although similar dates are well known from the Proterozoic belts to the north and south.The evidence suggests that those KAr biotite dates greater than about 2700–2800 my result from excess radiogenic argon incorporated during a thermal event of about this age or, more probably, during the 1600–1700 my Sr isotope homogenisation event. Scatter of mineral dates below about 2700 my could also be due, at least in part, to overprinting by the 1600–1700 my event.KAr mineral dates and an Rb-Sr mineral isochron from a pegmatite associated with the last major rock-forming event in the Godthaabsfjord area, namely the Qo?rqut granite, indicate an age of emplacement of 2580 ± 30 my.     

三峡工程运行对鄱阳湖水位影响试验

三峡工程运行改变了长江中下游水沙情势,影响了鄱阳湖湖区水位,造成了水资源利用、水质、湿地和生态等方面的新问题.实测日水位资料分析认为:湖区水位年内变化可分为低水、涨水、顶托倒灌和退水4个阶段;顶托倒灌阶段湖区水位基本由长江干流控制,另外3个阶段湖区水位受湖口流量和长江干流的共同影响,受影响程度与水位站位置、湖口流量和长江干流相互作用强弱有关;三峡工程运行没有改变鄱阳湖水位"高水湖相、低水河相"的基本特征,但对水位造成了一定影响.开展物理模型试验探索三峡工程运行对湖区水位的影响程度,结果表明:蓄水期三峡工程运行造成湖区水位降幅较大,枯水年都昌站平均(最大)降幅为0.94 m(2.58 m),枯水年湖区水面面积减小68%;增泄期会增加湖区水位,都昌水位最大增幅约1 m,平水年湖区面积增加约32%;枯水期三峡工程运行对鄱阳湖水位基本无影响.     

大脑中动脉狭窄程度与脑梗死前期CT灌注参数的相关性

目的:探讨单侧大脑中动脉(MCA)狭窄程度与脑梗死前期CT灌注(CTP)参数的关系,并分析梗死前期血管表面通透性(PS)的变化。方法:回顾性分析我院2018年7月1日至2019年10月1日期间经头颈部CTA诊断单侧MCA狭窄患者108例,观察CTP成像特点,测量各组患侧、镜像侧剩余函数达峰时间(TMax)、平均通过时间(MTT)、脑血流量(CBF)、脑血容量(CBV)以及表面通透性(PS),并计算各灌注参数的相对值(患侧/镜像侧),分析单侧大脑中动脉狭窄程度与脑梗死前期CT灌注参数的相关性。结果:①108例单侧大脑中动脉狭窄患者中39例出现灌注异常,不同程度血管狭窄的灌注分期差异具有统计学意义(P=0.009)。单侧大脑中动脉狭窄程度与灌注异常分期呈中等正相关(r=0.557,P=0.000)。②单侧大脑中动脉不同程度狭窄组间rCBF值、rMTT值差异有统计学意义(P<0.05),而rCBV值、r TMax值差异无统计学意义(P>0.05)。单侧大脑中动脉狭窄程度与rTMax值、rMTT值呈正相关(分别为r=0.458,P=0.003,r=0.765,P=0.000),与rCBF呈负相关相关(r=-0.600,P=0.000),而狭窄程度与rCBV值无明显相关性。③Ⅱa、Ⅱb期患者患侧与镜像侧PS绝对值差异有统计学意义(P<0.05),Ⅱa、Ⅱb期患者组间PS相对值差异没有统计学意义(P>0.05)。结论:单侧MCA狭窄程度与脑梗死前期分期具有一定相关性,单侧MCA狭窄程度越严重,rTMax、rMTT值越大,rCBF越小;在脑梗死前期的II期出现血管表面通透性升高的改变。