比较CT和X线检查对肠梗阻的诊断价值

目的:比较CT和X线平片对肠梗阻的检查技术及诊断价值。方法:比较CT、X线CR平片对肠梗阻患者的检查操作难度、检查消耗时间、图像质量、患者舒适度及图像显示病变的敏感性及准确性,同时比较患者及开单医生对X线CR平片、CT这两种检查的接受度。结果:在CT、X线CR平片对肠梗阻患者的检查操作难度、检查消耗时间、图像质量、患者舒适度及图像显示病变的敏感性及准确性方面,CT显著优于X线CR平片;但患者及开单医生对X线CR平片检查的接受度又显著高于CT。结论:CT是一种对肠梗阻很有价值的检查诊断工具

腰椎相关结构的退变规律

目的研究腰椎退变患者腰椎骨质、椎间盘、韧带、椎小关节退变及腰椎退变性失稳与年龄、性别的相关性,探讨腰椎退变规律。资料与方法对1180例腰椎退变患者的腰椎CT进行分析,观察不同年龄段、不同性别间椎体骨质、椎间盘、椎小关节、韧带退变以及退变性腰椎失稳的发生率。结果腰椎退变患者腰椎间盘的退变率最高,其次是腰椎骨质、椎小关节、韧带、腰椎失稳。以36岁为年龄分界,36岁以下为腰椎低退变率年龄,以上是腰椎高退变率年龄,不同结构伴随年龄增长的退变率并不是同步递增的,腰椎骨质、椎小关节、韧带退变率及腰椎失稳发生率最高在65岁以上年龄段,而腰椎间盘退变率最高在36~45岁年龄段。男性腰椎间盘、骨质的退变率明显高于女性;椎小关节、韧带的退变率在男、女性间无显著差异;而女性腰椎失稳率明显高于男性。结论总体上伴随年龄增长的腰椎退变,其不同结构的退变规律不一,在不同年龄段及性别间都存在明显差异,全面分析腰椎退变的影像表现有利于对腰椎退变性疾病的理解和治疗

Application of Gas-Contrasted and Window Technic in Diagnosing Gastro-Colon Lesion with CT

目的探讨空气造影低剂量CT扫描及低窗位图像诊断肠道病变的应用价值。方法126例疑有胃或结肠病患者随机分为2组,一组(69例)采用传统的水造影或无造影常规剂量CT扫描及常规窗位诊断,另一组(57例)采用空气造影低剂量CT扫描及低窗位图像诊断,以内窥镜检查为诊断标准,由资深医生采用单盲法评价诊断,比较2组图像的诊断自信度及正确率。结果医生对空气造影低剂量CT扫描及低窗位图像的诊断自信度和正确率明显优于传统的水造影或无造影常规剂量CT扫描常规窗位图像。结论充气造影低剂量CT及窗位技术诊断胃结肠病变明显优越于传统检查方法,值得提倡。 【英文摘要】 Objective To study the Value of low dose CT scanning with gas-contrasted and low window level in diagnosing gastro-colon lesions.Methods 126 cases suspected with gastro-colon lesions were randomly devided into two groups,group A(69 cases) were scanned with conventional water-contrast or non-contrast and conventional expose dose,and with conventional window level,group B(57 cases) were scanned with gas-contrasted and low expose dose,and using low window level.The images were evaluated by 2 experienced radiol..

Effects of temperature on the growth rates and survival rates of Haliotis diversicolor among different populations

在16、20、24和28℃这4个设定的水温下,以杂色鲍(HAlIOTIS dIVErSICOlOr)日本群体、台湾群体、越南群体和“东优1号“为材料,进行为期40 d的养殖试验,对4个杂色鲍群体在不同温度下的壳长日增长率(lgr)和体重日增长率(Wgr)进行比较.结果表明,“东优1号“杂色鲍群体在28℃时的lgr和Wgr值分别达到162.23±15.79μM/d和46.52±6.89 Mg/d,在4个温度下的lgr和Wgr值都优于其他3个群体,台湾群体在较高温度(24和28℃)条件下的lgr和Wgr值要高于日本群体,而日本群体在较低温度(16和20℃)时的值则高于台湾群体.双因素方差分析的结果进一步表明,温度对杂色鲍不同群体的生长率指标具有显著影响.The small abalone,Haliotis diversicolor,is naturally distributed along the coastal waters of East Asia and is a commercially important species cultured along the coast of southern China.The current study genetically characterized four different small abalone populations(Japan,Taiwan,Vietnam,and "Dong You No.1") that were reared at 16,20,24,and 28℃ for 40 days,and the values of length growth rate(LGR) and weight growth rate(WGR) were investigated.The study revealed that the Dong You No.1 and the Vietnam populations had the highest and lowest values of LGR and WGR,respectively.Dong You No.1 reached 162.23±15.79 μm/d for LGR and 46.52±6.89 mg/d for WGR at 28℃.In terms of LGR and WGR,the Taiwan population performed better than the Japan population at higher temperatures(24 and 28℃),while the Japan population performed better than the Taiwan population at lower temperatures(16 and 20℃).The impact of population and temperature on LGR and WGR was investigated by two-way analysis of variance.The current study indicated that the impact of population and temperature on growth were both highly significant(p<0.01),and a significant association(p<0.05) between population and temperature was also found.The results provide useful information for optimal growth conditions for the small abalone industry.国家863计划资助项目(2006AA10A407;2010AA10A401);广东省教育部产学研结合资助项目(2009B090300159);科技部农业科技成果转化资金资助项目(2010GB23600665

中国证券业市场结构分析 = The analysis of industrial structure of security industry in China

This study is aimed at analyzing the industrial structure change of this industry based on the theory of industrial organization.​Master of Science (Managerial Economics

偏置射流火焰稳定方法及其装置

本发明公开了一种能够稳定和强化燃烧的方法和装置。它是利用空气燃料混合物以一定速度偏轴地喷入燃烧室，使在燃烧室内产生一较大高温回流区，点燃直接落入其中的燃料。燃烧装置是由燃烧室和位于燃烧室前端面的偏置喷口组成。喷口安置在前端面中心轴线以上的半部

用于HIRFL重离子治癌的PET成像实验研究与蒙特卡罗模拟

为了HIRFL重离子治癌的需要 ,使用两个位置灵敏闪烁体探测器组成了一个简单的PET成像系统 .对PET成像进行了实验研究 ,实验测量得到了物体成像以及γ射线能谱 ,对于 5 11keV全能峰处的能量分辨率为 18 6 % ,峰总比为 5 2 4 % .采用GEANT3程序对该系统进行了模拟计算 ,并与实验进行比较 ,最后对该系统进行了优化设

RIBLL终端大面积中子探测器阵列研制方案的理论计算

介绍了一种用于丰中子核研究的RIBLL终端大面积中子探测器阵列的研制 .利用Geant4软件包对该探测系统的中子探测效率、时间分辨和位置分布等进行了蒙特卡罗模拟 ,同时对探测器的cross talk进行了研究 .给出了探测器的设计方案

中能区丰中子核~(11)Li的反应总截面的测量(英文)

利用HIRFL提供的50MeV/u的~(13)C束流轰击Be靶,通过RIBLL选择出放射性核素~(11)Li.实验采用透射法测量了25—45MeV/u的~(11)Li在~(28)Si靶上的反应总截面.采用双参数Gauss密度分布形式,利用Glauber模型很好地拟合了高能和中能区的~(11)Li实验数据,并从密度分布中提取了核的物质均方根半径