排序方式: 共有38条查询结果,搜索用时 15 毫秒
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为了及早诊治外伤性颅内迟发性颅内血肿,研究外伤性迟发性颅内血肿的CT表现、CT随访价值。方法:在120例颅脑外伤患者中行CT随访检查。结果:通过CT复查,32例发现有迟发性颅内血肿。其中硬膜外血肿16例,硬膜下血肿12例,颅内血肿4例。大约80%的血肿在外伤后3天内出现。结论:外伤后3天内积极CT复查能及早发现迟发颅内血肿。即使开初CT扫描正常者,如病人的临床症状体征有改变,应立即行CT复查。 相似文献
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目的:探讨鼻咽癌患者放疗后全脑灰质体积的改变情况。方法:对20例接受过放射治疗的鼻咽癌患者及16例已确诊而未行放射治疗的鼻咽癌患者,进行全脑高分辨率T1WI扫描,采用基于体素形态测量学(VBM)方法,分析鼻咽癌治疗组与未治疗组脑灰质体积变化的差异。结果:与未治疗组比较,鼻咽癌治疗组双侧颞中回、左侧额上回、左侧枕下叶脑灰质体积显著减少。结论:鼻咽癌放疗后部分脑区脑灰质体积减少,VBM可早期发现常规MRI未显示的异常。 相似文献
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MSCTA在颅内动脉瘤诊断中的应用 总被引:1,自引:0,他引:1
目的: 探讨多层螺旋CT血管成像在颅内动脉瘤的诊断中的应用。方法: 收集经手术证实或DSA的颅内动脉瘤31例,所有的病例均行多层螺旋CT血管成像。CTA通过采取VR、MIP及CPR等后处理重建技术,实现脑内血管重现,展现颅内血管的真实情况。20例行手术治疗,11例行DSA检查。结果: 本组31例,共36个颅内动脉瘤。29例单发,2例多发(7个动脉瘤)。MSCTA发现颅内动脉瘤33个,1个动脉瘤误诊;MSCTA正确诊断动脉瘤32个,4个动脉瘤漏诊。MSCTA诊断颅内动脉瘤的准确率为97%(32/33),敏感度为89%(32/36),平均直径为8mm(范围在3~35mm之间)。MSCTA所显示的动脉瘤与手术及DSA所见显示动脉瘤位置、大小、形态基本一致。结论: MSCTA能清楚显示颅内动脉瘤的形态、位置及其与周围的解剖关系,其诊断结果与DSA或/手术诊断符合率相当高,在颅内动脉瘤的诊断中有重要的价值。 相似文献
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Spatial Thinking by Young Children: Neurologic Evidence for Early Development and “Educability” 总被引:2,自引:1,他引:1
《The Journal of geography》2012,111(5):181-191
Abstract The human brain appears to have several “regions” that are structured to do different kinds of spatial thinking, according to a large and rapidly growing body of research in a number of disciplines. Building on a previous review of research with older children and adults, this article summarizes the research on spatial thinking by young children. Three conclusions: brain structures for spatial reasoning are fully functional at a very early age, adult intervention can enhance both use and representational ability, and practice in early grades is an important, perhaps even essential, part of the scaffold for later learning. 相似文献
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1 INTRODUCTION Amines and peptides are important bioactive substance in crustaceans, and they function as hor- mones, neurotransmitters and neuromodulators. By far, bioactive substances that have been detected from nervous system of crustaceans include se… 相似文献
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Distribution of Delphinidae (Cetacea) in relation to sea surface temperatures off Eastern and Southern New Zealand 总被引:1,自引:1,他引:0
D. E. Gaskin 《新西兰海洋与淡水研究杂志》2013,47(3):527-534
Records of four species of Delphinidae, Delphinus delphis, Lissodelphis peroni, Lagenorhynchus obscurus, and Lagenorhynchus cruciger in waters to the east and south‐east of New Zealand are discussed in relation to surface temperatures. In this region D. delphis appears to be largely confined north of the Subtropical Convergence and a minimum surface temperature of about 14°c, and near New Zealand from Hawke Bay southward in the warm water of the East Cape Current; L. peroni to the Subtropical Convergence and the subantarctic water to the south of it, between surface temperatures of 9°c and 16°c; L. obscurus to the immediate vicinity of the Subtropical Convergence and surface temperatures in summer of about 14° to 15°c, and L. cruciger across the Antarctic Convergence region, in a surface temperature range of 2° to 9°c. 相似文献
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论“互联网+”天基信息服务 总被引:1,自引:0,他引:1
"互联网+"代表了一种新的社会形态,为改革、创新、发展提供广阔的网络平台。随着互联网与传统产业的不断融合,"互联网+"正深刻改造、影响多个传统行业。"互联网+"给卫星对地观测与导航创造了大众化、普及化、智能化和实时化天基信息服务的有力条件。无处不在的地球空间信息大数据具有体量大、速度快、模态多样和真伪难辨的特性,形成了"数据海量、信息缺失、知识难觅"的局面。要实现地球空间全天时、全天候、全地域服务于每个人的目标,根本上解决现有地球空间信息服务系统覆盖能力有限、响应速度慢、体系协同能力弱的问题,满足大数据时代对地球空间信息"4R"服务要求,需要构建与地面网络深度耦合的"互联网+"天基信息服务体系。结合中国空天信息技术发展情况,介绍了"互联网+"天基信息服务体系建设的实施思路,分别对实现"互联网+"天基信息服务3个不同级别的特点进行了重点阐述。面向"互联网+"天基信息服务系统的要求,对地球空间信息学的重点支撑技术和系统发展前景进行了展望。 相似文献