扫描范围

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。

Mian colors achieving high speed single way rainbow and scrolling effect 0-100% mechanical linear dimming (tunable from full blanking to full opening effect) Mechanical linear DIMMER and 1-10 times/s high speed STROBE effect Horizontal 450°and vertical 250°scanning range, smooth scanning action and accurate orientation Precise adjustment on horizontal and vertical position Precise speed adjustment on horizontal and vertical position Pattern internal light rotating function,freely adjusting fast , low speed , clockwise and anticlockwise GOBO position adustment Automatic focusing function 3 Prism effect, prism colorwise and anticolorwise rotating Built-in over heat protection and high voltage protection 2 convection cooling-fan,optimize internal air duct way, heat elimination rapidely Compatible with DMX512 international digital singal PFC power factor compensation According to various kinds of safety standards, IP20 protect grades, The cable accords to the CE20/22 standard

PERFORMANCE TRAIT 8种主色彩，同时可作高速单向滚动效果 0-100%机械线性调光（可控制全遮光到全开光效果） 1-10次/秒超高速频闪调整效果水平540度，垂直250度扫描范围，动作平滑、流畅、定位准确水平、垂直运动位置可精确调整位置水平、垂直运动位置速度可调功能旋转图案可正反、快慢自由调节旋转图案角度可单独调整采用电子自动对焦，图案远近均清晰度可自由调整三棱镜及棱镜正、反自由旋转功能二只对流风扇致冷，内部优化风路设计，散热充分良好内置过热保护、触发高压保护接受DMX512国际标准数码信号 PFC功率因素补偿符合各种安全标准，IP20保护等级，电源线符合CE20/22标准

MS parameter: ion source: ESI; 50～800 m/z; ionization voltage: 3.0 kV; dry gas (N2) flow rate: 318 L/h; temp:150 ℃; emale cone voltage: 3.0 kV.

质谱条件：离子源：ESI；检出模式：正负离子二种形式；扫描范围：50～800m/z；电离电压：3.0kV；电喷雾接口干燥气(N2)流速318L/h；离子源温度150℃；锥孔电压30V。

The USB bus technology is applied to monochromator embedded control system to improve the au- tomatization of control, real-time performance and the speed of spectrum scan.

设计的双光栅单色仪驱动系统，采用高精度细分的步进电机驱动蜗轮蜗杆方式，提高了光谱扫描范围及精度。

Oxidation, diffusion, photoetching process and etching technology were adopted to achieve thin silicon foil with a thickness of 3 to 4 micrometers. The surface roughness was about 10nm and the grain size of silicon foil was nanometer scale. The preparation parameters were studied to control the roughness of thin silicon foil .

通过台阶仪测量厚度在3～4μm的Si平面薄膜，在扫描范围为1000μm时，它的表面粗糙度为几十纳米；SEM测量表明，Si薄膜表面颗粒度在纳米量级；探讨了采用控制扩散、腐蚀参数和表面修饰处理来降低Si膜表面粗糙度的方法。

Lines are induced on the surface of a photosensitive glass by focused femtosecond laser transverse writing with scanning velocity in a wide range of 40-1800 μm/s. The formed lines are analyzed using scanning electron microscope and optical microscope.

利用聚焦飞秒激光的横向直写方式，采用宽的扫描速度范围(40-1800 μm/s)，在光敏玻璃表面上诱导了直线结构，并扫描电子显微镜和光学显微镜分析了形成的直线，发现随着扫描速度不同，形成的直线具有三种不同的形貌。

Featuring a 1520-mm wide scan area and up to seven cameras and two lasers, Manta 1600 sorts as much as 15 metric tons of product per hour to perfectly match the requirements of most processed vegetable, potato, and fruit production lines.

具有一1520毫米宽扫描范围和7个相机和两个激光器，曼塔1600高达每小时15吨，各种产品，完美匹配最加工蔬菜，马铃薯的要求，和水果的生产线。

Mine detection scanning: suitable for a wide range addresses to scan, random scan, when scanning to a NT host, in the vicinity of its order to scan a small area.

探雷式扫描：适合扫描大范围地址段，随机地扫描，当扫描到一个NT主机后，在它的邻近小范围顺序地扫描。

A commercial Ti: Sapphire laser (Coherent Inc. 899-29 mode) can provide seamless scans as wide as 10THz and with the help of a wavemeter and a computer in 0.7～0.9μm wavelength range.

本文的目的是在CR899环行腔钛宝石激光器的基础上，扩展其波长自动扫描范围至0.9μm以上，为近红外波段的高分辨光谱研究提供必要的实验手段。

The optical system of the interferometer, calculated results and the phase change method by polarizers are described.

但是由于电子束扫描范围只有几个毫米，大面积图形的制作是依靠激光定位工件台来完成的。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。