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Material and Methods:From March,2008 to January,2009,250 patients(146 Males and 104 Females,ranged from 18 to 82 years old,mean age was 48 years old) enrolled in the First Affiliated Hospital of Kunming Medical College were performed dual energy scan(Group A,200 patients) and Neuro-DSA scan(Group B,50 patients) using DSCT.The patients were randomly divided into Group A and Group B.Regarding to the justification of scan protocol,100 patients in Group A were selected as sub-group to explore the scan protocol.The image quality Was analyzed both in four categories(4.0/60、4.5/60、4.0/70、4.5/70) of flow rate and total amount of contrast-enhanced material and in three categories(100—150HU、150—200HU、200-250HU) of CT value of left common carotid artery.The comparison of two scan approach was based on image quality,radiation does, postprocessing methods,time of scanning and subtraction and data storage amount.To validate the diagnostic capability of DE-CTA virtual unenhanced images,100 patients in Group A were undergoing head scan both in routine non-contrast program and DE-CTA virtual unenhanced program.Mean CT values,signal-to-noise ratio,image quality,sensitivity of lesion identification,and radiation does were applied to comparison.According to diagnostic results of dual energy of cerebral arterial angiography,62 patients out of 200 patients in Group A were confirmed with cerebral vessel lesions,the results were complied with DSA findings(the time between the two methods were within 1 week).

材料与方法收集2008年3月到2009年1月间在昆明医学院第一附属医院行DSCT CTA检查者250例(男性146例，女性104例，年龄范围18-82岁，平均48岁)，随机分为A、B两组，A组200例行双能量头颅CTA扫描；B组50例行Neuro-DSA扫描。A组前100例按对比剂不同流率和总量分为4组(4.0/60、4.5/60、4.0/70、4.5/70)对图像质量比较；按触发时左颈总动脉内平均CT位分3组(100—150HU、150—200HU、200-250HU)，比较图像质量的差异；对A、B两组血管图像质量、辐射剂量、后处理的方法、扫描和后处理时间及数据的容量进行比较分析；A组中前100例行常规与DE-CTA虚拟平扫的平均CT值、信号噪声比、图像质量、病灶显示情况、辐射剂量的比较分析；A组中行DSA检查62例(两种方法间隔时间均1周内)，比较两种检查方法诊断结果是否符合，并对其中24例动脉瘤行动脉瘤部位、数目、形态、瘤颈显示程度、瘤颈大小及瘤体长径和短径的比较研究。

We firstly discuss minimal sets characterizations of closed-set lattice , then systematically study the categorical properties of categories CL and PairCL by the means of the join-semilattices closed-set-latticefies, and the constructions of monomorphism, epimor-phism, extremal monomorphism, extremal epimorphism, section, retraction, subob-ject, quotient object, product, co-product, equalizer, coequalizer, inverse limits and direct limits in the categories CL and PairCL are given.

首先讨论了闭集格的极小集刻划，然后通过并半格的闭集格化这种方法，较为系统地研究了范畴CL及范畴PairCL的性质，给出了范畴CL和范畴PairCL的单态射、满态射、极端单态射、极端满态射、截节、收缩、子对象、商对象、极端子对象、极端商对象等特殊态射和特殊对象的具体刻划，并且研究了它们的等化子和余等化子、乘积和余积、逆极限和定向极限的具体构造。

We firstly discuss minimal sets characterizations of closed-set lattice , then systematically study the categorical properties of categories CL and PairCL by the means of the join-semilattice's closed-set-latticefies, and the constructions of monomorphism, epimor-phism, extremal monomorphism, extremal epimorphism, section, retraction, subob-ject, quotient object, product, co-product, equalizer, coequalizer, inverse limits and direct limits in the categories CL and PairCL are given.

首先讨论了闭集格的极小集刻划，然后通过并半格的闭集格化这种方法，较为系统地研究了范畴CL及范畴PairCL的性质，给出了范畴CL和范畴PairCL的单态射、满态射、极端单态射、极端满态射、截节、收缩、子对象、商对象、极端子对象、极端商对象等特殊态射和特殊对象的具体刻划，并且研究了它们的等化子和余等化子、乘积和余积、逆极限和定向极限的具体构造。

A reasonable warmer winter indexin the framework of the three equiprobability categories(i.e.warmer,normal and colder categories)is proposed based on the winter temperature data observed at 565 stations in China during 1956-2005,where the IWWI is defined as the ratio of the station number of warmer category over the total number of stations.

利用全国565个台站1956-2005年冬季平均温度资料，将多年温度变化划分为偏暖、偏冷和正常三类等概率气候事件，由此给出了一个新的暖冬指数和暖冬的定义。结果表明：暖冬指数与中国冬季温度的变暖趋势相一致，并表现出显著的年代际变化特征，其变率分别为10%/10a和0.4℃/10a。近50a暖冬事件共计发生13次，其中近85%的暖冬发生在1986年以后。

In the prince's eyes , women could be divided into two categories kindhearted and categories gories: evil-minded.

在王子眼里，地下室小囚房女人分成两个种类心地善良的和心地狠毒的。

You can prepare and sort standard presort mail letter or flat categories, First-class presort mail, bar-coded items, or periodical presort mail letteror flat categories.

你能够准备和整理标准的预分类预排序邮件信或者沉闷的分类，第一课预分类预排序邮件， bar-coded 条款或者定期的预分类预排序邮件信或者沉闷的分类。

The model microphysics has 2 liquid hydrometer categories and 5 ice categories that are cloud ice, snow, graupel...

结果表明(1)自然云的模拟与观测事实一致，如最大上升气流速度、云顶高度、流场结构以及雹胚组成等。

They are in their homes. They are not displaced, but they are poor, they may be unemplyed, don't have jobs, they maybe elderly, they maybe handicapper, they fall into a lot of categories, but they don't fit into some of the other standard categories that we see in Iraq such as internally displaced.

他们在自己的家里，并非没有地方住，但他们很穷，他们可能失业，没有工作，可能是老年人，可能是残疾人，他们可分为很多类型，但都不能属于任何一类标准的类型，即我们认为的在伊拉克的那些类型，如没有地方住等。

This SubPanel allows you to create new Link Categories, edit or delete existing ones, and organize your Link Categories hierarchically.

这个子面板能够使你创建新的链接类别，编辑或者删除当前的链接类别，并且有层次地组织你的链接类别。

There are very, very few hydra-headed categories. That is, categories that have two dominant brands with virtually identical market shares.

多头领先的产品领域并不常见，这意味着两个具备相同市场份额的品牌在领域内同时占据领先。

It's bell can reach over a meter in diameter.

它的身体最大可以达到直径1米多。

Now they are overdue and I shall have to pay a fine.

现在他们过期了，我不得不付罚款。