Results 31 to 40 of about 6,488 (151)
, 2004 目的 评价CT三维成像对寰枢关节不全脱位的显示及诊断价值 ,探讨最佳三维成像方法。 方法 回顾性分析 4 1例寰枢关节不全脱位的CT影像学表现 ,比较横断面图像、多层面重建 (multiplanarreformatting ,MPR)法、表面遮盖 (surfaceshadedisplay ,SSD)法、最大强度投影(maximumintensityprojection ,MIP)法及容积重建 (volumerendering,VR)法三维图像显示的病变情况。 结果 寰枢关节不全脱位 4 1例 ...
叶锋 +6 more
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Functional Ecology, Volume 39, Issue 9, Page 2327-2341, September 2025.Read the free Plain Language Summary for this article on the Journal blog. Abstract While elevational patterns of soil bacterial and fungal communities in mountain ecosystems have been well documented, the assembly processes of soil archaeal and protistan communities, and their linkage with ecosystem multifunctionality (EMF), remain poorly understood ...
Bao‐Min Yao +14 more
wiley +1 more source
InGaAsP／InP异质结构材料X射线衍射摇摆曲线中的干涉指纹研究
Guangtongxin yanjiu, 1995 双晶衍射摇摆曲线的全面分析需用计算机模拟高木方程才能得到，其信息广但不直观。本文讨论了ＭＯＣＶＤ外延片Ｘ射线衍射中的干涉指纹，指出了用干涉指纹测试薄膜厚度的精确性，讨论了干涉指纹出现的一些特征，使能直观地得到一些外延片的结构信息，为识别和正确使用干涉指纹估算薄层厚度提供依据。
丁国庆 +3 more
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Thalassemia Reports, 2012 Several attempts have been made previously to differentiate β-thalassaemia trait (BTT) from other microcytic anaemias using formulae with red cell (RC) parameters. Presently available formulae have low sensitivity and specificity.
Ahangama Arachchige Nilanga Nishad +3 more
doaj +1 more source
, 2002 【目的】探讨电子束CT(EBCT)测定心功能的价值。【方法】通过分别对15 例冠心病患者行EBCT 和X 线心室 造影检查, 测定心功能指标:左室舒张末容积(LVEDV)、左室收缩末容积(LVESV)、每搏输出量(LVSV)、左心室射血分数 (LVEF)和左心室壁运动计分(LVWMS), 比较两者的相关性和差异性。EBCT 还分别测出15 例患者的心肌质量。【结果】EBCT 测定的LVEDV、LVESV 、LVSV 及LVEF 与X 线心室造影比较, 具有良好相关性(r =0.823 ～ 0 ...
姚尖平, 张 希, 王治平
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Trade credit and corporate digital transformation: The role of managerial ability
Financial Review, Volume 59, Issue 3, Page 779-806, August 2024.Abstract We examine whether managerial ability affects the relationship between corporate digital transformation and trade credit. To measure digital transformation, we perform a textual analysis of companies’ annual reports using a customized Chinese dictionary containing digital transformation keywords based on national policy documents and academic ...
Liukai Wang +3 more
wiley +1 more source
Value of CT and MRI imaging features in differential diagnosis of giant cell tumors with prominent aneurysmal bone cysts in the extremities and primary aneurysmal bone cysts [PDF]
Objective To explore the value of computerized tomography (CT) and magnetic resonance imaging (MRI) imaging features in differential diagnosis of giant cell tumors with prominent aneurysmal bone cysts (GABCs) in the extremities and primary aneurysmal ...
LIU Jianhui, WANG Dezhi, CUI Jiufa, XU Wenjian
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, 2007 目的:利用仿真模型研究结肠结节状病灶的特征、CT扫描参数、阅片视窗及仿真成像(CTC)对CT检出病灶的影响。材料与方法:利用仿真材料制造30个结节放置到仿真人的结肠内壁上,结节分别为0.5cm隆起形、0.3cm隆起形、0.2cm隆起形、0.2cm扁平形、0.2cm高密度扁平形,每种结节6个。分别应用方案8.0mm/2.5mm/17.5(层厚/准直/螺距)和方案5.0mm/1.0mm/7.0扫描并CTC成像。对横断面扫描图像分别应用3种视窗阅片。检测不同情况下结节的显示情况。结果:窗宽1000HU,窗中心-
周水添 +4 more
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, 2007 【目的】评价64层螺旋CT在诊断冠状动脉畸形方面的临床应用价值。【方法】对38例冠状动脉畸形的64层螺旋CT资料进行回顾性分析。将原始数据传至工作站，行多平面重建（MPR）、容积再现（VR）、最大密度投影（MIP）和血管探针等后处理。10例同时行传统冠脉造影（CAG），3例行手术。【结果】38例患者畸形血管在CT图像上得以清晰显示。冠状动脉开口起源异常6例，单支冠状动脉畸形2例，冠状动脉瘘2例，冠状动脉肌桥20例，副冠状动脉8例，10例CAG结果9例与CT一致，1例右侧冠状动脉高位开口CAG误诊为缺如 ...
周旭辉 +5 more
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Gaoya dianqi, 2014 针对某型号直流断路器入口铜排的大电流测试需求,构建了矩形阵列霍尔电流传感器（RA-HCT）的基本模型;从机理角度剖析外部磁场对传感器测量准确度的影响,并构建外部平行导线对霍尔电流传感器的影响模型,得出测量误差计算方法,设计实现额定电流10 kA的12点阵RA-HCT。通过设计对比试验,得出x轴方向理论误差与实际误差最大为10%左右,y轴方向理论误差与实际误差最大为2%左右,小于设计误差3%,满足装备的测试需求,并验证了算法的正确性,为提高传感器的测量准确度提供了理论依据。
沈兵, 张超, 陈亮, 许进宝
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