随机扫描

Methods: for abdominal CT scan of 240 elderly patients were randomly divided into two groups.

选择进行腹部CT增强扫描的老年患者240人，随机分为两组。

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 200 cases (252 knees) of total knee arthroplasty were randomly divided into two groups: Experience group (64 cases): femoral prothesis rotational certification was depended on the palpation of the femoral epicondyle axes combined with Whiteside line in operation. CT scan group (136 cases): femoral prothesis rotational certification was depended on the preoperation CT scan, by which could modulate the lateral rotation angle. The other procedure was same to the standard TKA.

将200例（252膝）TKA患者随机分为两组：①经验组（64例）：TKA术中根据术者触摸外科股骨上髁轴线联合Whiteside线联合确定股骨假体外旋角度；②CT扫描组（136例）：术前CT扫描确定股骨后髁角，术中采用可调外旋定位器复制CT确定的外旋角度，其余TKA手术操作相同。

In this paper the effects of scanning truncation error, scanning position error, random amplitude and phase error, and multiple-reflection error in near-field antenna measurement are analyzed; error equations and the uncertainty of measurement are obtained through computer simulation; compensated techniques for reducing the effects of measurement errors in near-field antenna measurement are presented and the formula and arithmetic of phaseless near-field techniques are derived.

本文从解析法和数值仿真两个角度深入分析口面天线近场测量中扫描面截断误差、扫描面位置误差、随机幅相误差、多次反射误差等误差源对天线远场特性测量精度的影响，一方面从理论上给出相应的误差方程，另一方面建立误差分析模型，通过计算机模拟，得到不同误差条件下测量结果的不确定度，并介绍了减小这些误差的修正方法，推导无相位近场测量的公式和算法。

Methods:40 cases of patient that pelvis CT scans were chosen at random, and divided into four groups of competent pelvises and scan at random in method.

随机选取行骨盆CT扫描的患者40例，分为4组行骨盆扫描。

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。

Methods forty patients with head/neck 16 slice CT angiograph were divided into two groups at random,each group has 20 cases, the plain scan and the CTP was performed before CTA to all 40 cases. Group A use CTP to obtain the peak time of contrasted artery as CTA delay time, and scan from head side to foot side. Group B use contrast media automatic bolus tracking to obtain delay time,scan from foot side to head side.two groups CTA images were collated.

使用16排螺旋CT对40例患者行头颈部CTA检查，随机分为两组，各20例，所有患者在CTA之前行脑CT平扫及脑CT灌注扫描，A组以CTP所显示的动脉峰值时间作为CTA的延迟时间，扫描方向为自头侧向足侧。B组使用造影剂浓度实时监控跟踪触发技术确定延迟时间，扫描方向自足侧向头侧扫描，两组CTA图像相对照。

During CT scan,patients were in supine position, and the teeth in the middle of the contactposition on the jaw; and maintain a static head and body during the scanningprocess, did not swallow; measurement parameters including: soft palatelength, maximum thickness of the soft palate, pharynx lateral spacing, uvula length and base width of the free edge ofsoft palate to the throat wall spacing, velopharyngeal cross-sectional area,angina cross-sectional area,thickness of retropharyngeal wall.

随机对10例患者进行系统的腭咽CT测量，测量时间为术前、术后3个月、术后6个月；测量方法为：患者在清醒状态下进行平静呼吸时的上气道CT扫描，范围自听眶线至声门。利用CT工作站进行三维重建和测量。CT扫描时患者取仰卧位，牙齿处于正中颌的接触位上。

Methods 24 patients known to suspect of having pulmonary embolism underwent MCTPA with 20 ml contrast medium. Scanning delay time was adjusted by using a test bolos. Contrast medium injection rate was 5.5 ml/s. The time of imaging data acquisition was 2-3 s. In addition 24 patients undergoing MSCTPA with 50 ml contrast medium were included in control group. Imaging quality was evaluated by five degree with blind method.

应用多层螺旋CT对24名疑似肺栓塞的病人行CTPA检查，对比剂总量为20 ml(300 mgI/ml)，以单层动态增强扫描所测时间－密度曲线的峰值时间为扫描延迟时间，对比剂注射速率5.5 ml/s，数据采集时间2~3 s；另随机选择24例常规对比剂剂量(50 ml) CTPA检查影像作为对照组，影像质量按5级行盲法评价。

Methods 42 cases mature neonate with MSCT scanning in lung were collected and randomly divided into three groups averagely. The tube current was 50 mAs and 30 mAs for low dose scanning and 200 mAs for routine dose. The CT value of region of interesting and standard deviation were measured in the aorta that region of carina of trachea. And compared the noise, image quality, CT dose index and dose length product between two low-dose scannings and routine dose.

42例足月新生儿随机等分成3组分别行低剂量30mAs、50mAs及常规剂量200m AsMSCT胸部扫描，统一于气管分叉处测量并记录主动脉CT值及标准差，比较两低剂量扫描与常规剂量扫描的噪声、图像质量、CT剂量指数和剂量长度乘积等差别。

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％。