卡瓦提供的射束场限制器是什么？
导向射束：可精确定位发射器。
我们已经扭曲了德国的射束。
定向信标指挥驾驶员，射束则指向目标。
The beacon beckoned to the pilot, the beam pointed to the target.
体外射束放射治疗中患者的放射卫生防护标准。
Radiological protection standards for the patient in external beam radiological therapy.
将它们与反回射束作对比而获得真实的地面速度。
The frequencies of the returned beams are compared with them to obtain the true ground speed.
可精确定位发射器：导向射束可精确表明需进行X光检查的区域。
For exact positioning of the emitter: the pilot beam indicates exactly which area will be X-rayed.
无线电射束也象探照灯的光束一样，是不能高度集中的；它总要散开。
Like the searchlight beam, the radio beam cannot be made very sharp; it tends to spread.
研究一种有别于软件校正模型的更为简单实用的射束硬化伪像校正方法。
This paper introduces a simple and practical method to correct the beam hardening artifacts, which is different from the method of software correction model.
一组NASA资助的研究人员正在用激光射束击月球的方法，检验等量原理。
A group of NASA-supported researchers are going to test the Equivalence Principle by shooting laser beams at the Moon.
更难的是，在整个压缩、加速和聚焦阶段中，射束必须一直保持在这样的高品质。
What is more, the high beam quality must be preserved throughout the compression, acceleration and focusing stages.
传统的射束硬化校正方法，通常需要针对每一种材料测量该材料对射线的吸收曲线。
For the empirical beam hardening correction in computerized tomography (ct), it is necessary to measure an attenuation curve for the material.
所公开的方法包括提供多个调制的多能质子小射束并且用该多个调制的射束照 射靶标区。
Disclosed methods include providing a plurality of modulated polyenergetic proton beamlets and irradiating the targeted region with the plurality of modulated beamlets.
实验结果表明，IL校正法能去除射束硬化的影响，并能有效地抑制校正过程中投影噪声的放大。
Experimental results show IL correction method can eliminate beam hardening effect and suppress the projection noise enlargement effectively in correction process.
实现这种效果具代表性地是采用固定、圆形的准直器，它能够产生边缘锐利、高适形的治疗射束。
This is typically achieved using fixed, circular collimators that produce sharp-edged, highly conformal treatment beams.
结合实践经验，详细介绍了雷达等射束高度图（也称为雷达有效地理视距图）制作的原理和方法。
The drawing method and principle of radar chart with iso beam height (radar range chart) were described based on the practical experience.
本文提出的光子虚拟源模型能够较为精确地模拟计算任意形状和强度的外照射放射治疗射束分布。
The proposed photon virtual source model is suitable for accurately simulating arbitrary shape and intensity distributions of external beam.
该方法对X射线进行一定程度的预硬化，通过实验获得预硬化材料种类及射束硬化伪像的校正规律。
The method made the X-ray beam harden at first, and then the kinds of prehardening materials and correction rule of beam hardening artifacts were obtained through experiment.
恒定磁场产生器，位于该磁性扫描器的近端处，在该射束路径之中产生磁场，用于减轻零磁场效应；
A set of entrance magnets are positioned about an entrance of the scanner and generate a constant entrance magnetic field across the path of the ion beam.
为了实现工业CT系统射线源的精确定位，设计了射束中心位置测试专用装置，并开发了测试程序。
The special setting for precise positioning of the X-ray source in industrial Computed Tomography (ICT) system has been made, and the testing program has been developed.
所述设备具有用于保持衬底的衬底台，所述投影系统用于把已形成图案的射束投影到衬底的目标部分上。
The apparatus has a substrate table configure to hold a substrate, a projection system configured to project the patterned beam onto a target portion of the substrate.
当使用这样的射束时，添加用于中和空间电荷的影响的电子或负离子对于获得成功往往是有决定性意义的。
When employing such beams, the addition of electrons or negative ions for neutralizing the effects of space charge is often crucial for achieving success.
用来屏蔽带电粒子束的设备。射束屏蔽单元(1)包括固定到支撑板(15)的第一和第二屏蔽板(2,3)。
Apparatus for blanking a charged particle beam a beam blanking unit (1) comprises first and second blanking plates (2, 3) mounted to a support plate (15).
在原有模糊权重优化算法基础上提出一种简化方法。采用线性主射束替代三维锥形射束的方法消除了锯齿现象。
A simplified method based on fuzzy weight function is proposed in this paper. 3d taper beam is replaced with line beam in the new method, which can avoid sawtooth phenomenon.
本文应用蒙特卡罗算法建立了一个光子虚拟源模型，用于模拟计算任意形状和强度的外照射放射治疗的射束分布。
A photon virtual source model was developed for simulating arbitrary shape and intensity distributions of external beam using Monte Carlo method.
若直接用多色投影数据来重建图像，就会出现射束硬化伪迹，这种硬化伪迹如果不校正就会影响医学诊断和工业检测的结果。
Once this kind of data is used to reconstruct the image directly, beam-hardening artifacts appear in the reconstructed image.
技术系统包括用作入射器的加速器、高能加速器(可采用同步回旋加速器)、射束输送管、旋转架质子输送和射线管口、治疗床、管制次系统等。
Technical system includes the injector and the accelerator subsystem, synchrotron, beam transport, gantry with beam transport and nozzle, treatment couch and control subsystems etc.
技术系统包括用作入射器的加速器、高能加速器(可采用同步回旋加速器)、射束输送管、旋转架质子输送和射线管口、治疗床、管制次系统等。
Technical system includes the injector and the accelerator subsystem, synchrotron, beam transport, gantry with beam transport and nozzle, treatment couch and control subsystems etc.
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