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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。

Methods Total 474 patients were performed with plain CT scanning. 167 patients underwent ducal and delayed dynamic contrast enhanced CT scanning. According to different diseases, multiple planar reconstruction and three dimensional volume reconstruction were used on 72 patients.

运用16层螺旋CT扫描速度快，重建功能强大的有利条件，对474例患者行泌尿系平扫，167例行双期、延迟期扫描，根据病变情况对72例进行了MPR、3D、CPR等重建。

I look around the dunghill, there was no any picks here.

我用眼睛在肥堆旁扫了一遍：这里没有镐。

Scientists think that the slight white apparition is actually a Martian dust devil that was caught swirling across Mars.

科学家认为那个微小的白色幻影实际上是火星尘暴，也就是扫过火星表面的旋涡。

Starting now, I'll watch you make your bed, sweep the floor and dust all the furniture every day.

从现在开始我将每天看着你整理你的床铺，扫地板和拂拭所有的家具。

Also, as our sun orbits the galactic center it may sweep through areas of interstellar dustiness.

也可能是，太阳运行在银河系中扫过的星际中的尘埃。

If your dress has an open neckline, be sure to warm up your neckand chest with a dusting of bronzing powder.

如果你的礼服有一个敞开的领口，在脖子和胸部扫上一层薄薄的古铜色散粉，使它们呈现出暖色调。

Finally, I have to sweep the dust off all together, loaded with dustpan, and into the trash.

最后，我把所有的灰尘都扫到一起，用簸箕装好，倒进垃圾桶中。

Thus, the two brothers with a broom and dustpan to sweep up the sun terrace.

于是，兄弟两人拿着扫帚和畚箕，到阳台上去扫阳光。

After I swept the floor, I scooped up the refuse from it with dustpan.

扫完地以后，我从地上用簸箕撮走了垃圾。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。