射束

基于射束衰减网格的锥束CT散射校正方法

Beam Attenuation Grid-based Scatter Correction Method for Cone Beam CT

X射线工业CT系统都会产生不同程度的射束硬化伪像。

The X-ray industrial CT system will produce undesirable beam hardening artifacts .

CT系统的能谱估计及射束硬化校正算法

Estimation of Energy Spectra of CT System And Beam-Hardening Correction Algorithm

工业CT射束硬化校正方法研究

The Research of Beam Hardened of Industrial Computed Tomography System

射束硬化校正是CT算法研究中的重要问题。

Beam-hardening correction is of importance in CT reconstruction algorithm .

X-射线工业CT射束硬化校正中噪声的抑制

Noise suppression in beam hardening correction of X-ray industrial CT

基于配准模型仿真的锥束CT射束硬化校正方法

Beam Hardening Correction Method for Cone-Beam Computed Tomography Based on Registered Model Simulation

基于CT数据一致性的双多项式射束硬化校正改进

Improvement of Bi-polynomial Method for Beam Hardening Correction Based on Consistency of CT Data

高能X射线原始射束剂量测定

Determination of primary dose component in high energy X rays

基于分段硬化曲线的X射线CT射束硬化校正方法

Beam Hardening Correction Method for X-Ray Computed Tomography Based on Subsection Beam Hardening Curves

射束硬化是由X射线束能谱的多能性和衰减系数与能量的相关性造成的。

Beam-hardening is caused by polychromatic energy spectrum and energy dependency attenuation coefficient .

电离层ES层对综合射束污染的初步分析

A Preliminary Analysis of Pollution of Ionospheric Sporadic E Layer on Metre-wave Aperture Synthesized Beam

基于CCD的多方向平行射束投影系统图像重建

Image Reconstruction with Multi-direction Parallel Beam Projections Based on CCD

X射线透射ICT中射束能谱硬化修正

The Correction of Energy Spectrum Hardening in ICT Beam with X-ray

医用电子加速器治疗室内非主射束X射线辐射水平的测量

Measurements of equivalent dose rates from non-primary beam x rays in therapy rooms of medical electron accelerators

CT投影数据是射线关于被测物体的线性衰减的积分，即沿给定射束路径计算出来的线积分。

The projection data is the intergral of linear attenuation on the object . Linear Space Linear programming Attenuation : 2 ;

Ge（111）反射束的高次中子成分

High order components of neutron beams from ge ( 111 ) reflection

在X射线工业CT（ICT）中，射束硬化会导致重建的图像出现伪影，甚至产生变形。

In X_ray industrial computed tomography ( ICT ), beam hardening caused reconstruction image artifact and distortion .

并通过在不同位置快速测量辐射野，实现X射线主射束、光阑、快门、过滤片、定位装置同轴性的调整。

The coaxial adjustment of the X-ray beam , aperture and shutter , the filter , positioning device is realized .

仿真结果表明，采用CCD的平行射束投影系统可重建出很高质量的图象。

The result of the simulation indicates that the Parallel Beams Projection system with CCD can reconstruct high quality image .

为了研究基于PI线段的反投影滤波重建方法在CT（ComputedTomography）系统中的应用，提出了一种基于平行PI线段的简化的平行射束重建算法。

A simplified algorithm for parallel-beam computed tomography ( CT ) reconstruction was developed using a PI-line segment-based backprojection algorithm in CT system .

X射线TICT中射束硬化拟合校正研究

Beam hardening fitting correction method for X-ray TICT

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 .

其中RT记录包括射束治疗记录、近距离治疗记录和放射治疗总记录。

The RT records include : beam therapy record , close distance therapy record , and radiotherapy total record .

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 .

在X射线层析成像（X-CT，X-RayComputedTomography）技术中，X射线束能谱的多色性将导致层析重建图像出现杯状或条状等射束硬化伪迹，降低成像质量。

The polychromatic spectrum leads to cup or streak beam hardening artifacts and reduces the image quality in X-CT ( X-ray computed tomography ) .

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 .

X射线法用于缺口根部和裂纹尖端等徽区的残余应力测试的先决条件是解决缩小光束直径、提高衍射束的强度和准确设置试样等技术问题。

Measurement of residual stress at notch root and crack tip can be realized with a precise setting device for specimen and a X-ray of small beam size and high intensity .

射束同步放疗技术以四维CT成像技术为基础，控制动态多叶光栅使射束随着肿瘤的运动而不断运动，是最理想的放疗实现模式。

Synchronized moving aperture radiation therapy is the most ideal solution , which based on 4-dimensional CT imaging , synchronize the moving radiation beam aperture formed by a dynamic multi-leaf collimator with the tumors movements .

电子射程随着原子序数的减少和入射束能量E0的增加而增加。

The electron range increases with decreasing atomic number and increasing incident beam energy E0 .