查询词典 spiral

Objective: To study the valuation of multi-slice spiral CT in the diagnosis of pulmonary embolism.

目的：探讨多层螺旋CT肺血管成像对肺动脉栓塞的诊断价值。

Embryologic development, imaging methods, CT features and multiple postprocessing display modalities based on spiral CT were discussed.

目的分析苗勒管囊肿的CT平扫及经皮穿刺精囊造影术后CT扫描的影像表现，以提高对其认识。

The work piece revolve with stalk to enter give, work piece of spiral sport, revolve of emery wheel, the enter of emery wheel give etc.

工件的旋转与轴向进给，工件的螺旋运动，砂轮架的旋转，砂轮的进给等关联运动能在伺服系统的控制下作插补运动实现。

Objective To study the clinical value of chest Xray and spiral CT scan in diagnosis of mediastinal emphysema.

目的：探讨X线胸片和螺旋CT对纵隔气肿的诊断价值。

Objective To determine the value of spiral CT Virtual Endoscopy in patients with suspected gastric diseases.

目的 研究螺旋CT仿真内镜诊断胃组疾病的临床价值。

Key Words:spiral CT enterograph,double contrast barium-air gastrointestinography,small intestine tumor

螺旋CT小肠造影，气钡双重对比造影，小肠肿瘤

This technique is presented to calculate the far field around the equiangular spiral antenna using the formula according to the former theoretical result.

通过给出该假设下射线场幅度和方向的分布，文中具体计算了平面等角螺旋天线在罩内的远区特性。

Two novel spherical helical antennas can be designed by projecting the planar equiangular spiral antenna onto the surfaces of hemisphere and partial sphere. Their radiation properties are analyzed by the moment method with curved basic and testing function, and the curves of the VSWR, gain, polarization and pattern vs.

将平面等角螺旋天线投影到半球面和部分球面上，可得到两种新型球面螺旋天线，采用基于曲线基函数的矩量法对其辐射特性进行了分析，给出了天线的驻波、增益、极化及方向图等随频率变化的曲线。

Therefore this imaging system can realize two kinds of X-ray radiology: reverse geometry X-ray and X-Scan imaging, and several CT scanning methods, such as equiangular fan-beam CT, equispatial fan-beam CT, helical/spiral CT, cone-beam CT with circle orbit, cone-beam CT with circle-plus-line orbit.

这样就可以实现倒置结构的X射线成像方法、等角扇束的扫描方法，以及本文所提出的凹面源加点探测器的锥形束扫描方法，而且还避免了使用成组点探测器带来的性能不一致性。

Big, beautiful, barred spiral galaxy NGC 1300 lies some 70 million light-years away on the banks of the constellation Eridanus.

美丽巨大的棒旋星系NGC 1300位在波江座内，距离我们约有七千万光年远。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。