tube voltage

The study of the effect of X-ray tube voltage on CT Number

X线管电压对物质CT值影响的研究

A study of the effect of X-ray tube voltage on image quality and radiation dose

X线管电压对图像质量和放射剂量影响的研究

Effects of the tube voltage on the chest image quality of digital radiography

管电压对胸部DR影像质量的影响

Evaluation the influence of tube voltage mid-frequency and industry frequency X-ray machine to image quality by ROC curve

用ROC曲线评价中频和工频X线机管电压对影像质量的影响

Research on the relationship of exposition time and tube voltage in using X-ray to probe internal flaw of workpieces

论在X射线探伤中曝光时间与管电压的关系

The most vessels were showed with the X-ray tube voltage of 85 kVp .

当X线管电压为85kVp时显示的体模管最多。

The tube voltage all were 120 kV , the dosage of contrast media was 90 ~ 100 ml ;

管电压均为120kV，造影剂用量均为90～100ml，流速3ml/s；

Results The pixel mean value of the image in region of interest was not influenced by the exposure tube voltage or mAs .

结果感兴趣区像素值均值基本不随管电压和毫安秒的变化而改变。

The relationship between the pixel values of images and X-ray tube voltage was analysed with a different situation of air kerma .

分析了不同比释动能状态下图像像素值与管电压间的变化关系。

Conclusion Radiation injuries may effectively decreased with reducing X-ray tube voltage and exposure level under the precondition of X-ray image quality to be guaranteed .

结论在保证X线图像质量前提下，降低X射线管电压和曝光量，可以有效地减少放射性损害。

Objective : To obtain suitable digital radiologic exposure factors of CR and DR by measuring stability of their X-ray tube voltage and exposure time .

目的：通过测试数字成像设备的X线机管电压和曝光时间稳定性，探讨数字成像摄影条件的选择原则。

The results show that the scattering ratio decreases with the increase of tube voltage at first and then keep constant when tube voltage reaches to some value .

随着管电压的增加，散射比减小，当管电压大于一定值时，散射比与管电压无关。

In order to control the quality of X-ray diagnostic machine , non-intrusive X-ray tube voltage measurement system was designed according to the theory of radiation dosage testing .

为了实现X射线诊断机的质量控制，根据辐射剂量测量的原理，设计了非介入式X射线管电压测量系统。

This thesis studies that three level bi-directional inverter can effectively reduce the power switch tube voltage stress , and extend the service life of the switch tube .

本文研究的三电平双向逆变器可以有效地降低功率开关管上的电压应力，延长开关管的使用寿命。

Methods To automatically adjust x ray tube voltage of fluoroscopy for image brightness control , to use phototimer for autocontrol of exposure time .

方法自动调整透视管电压以控制图像的亮度；利用光电计时器自动控制曝光时间。

The major photographic conditions are tube voltage , which relates to the thickness of seed and exposure value , which based on the tube voltage , focal distance and sensitive material .

摄影条件主要取决于管电压和曝光值，管电压与种子厚度有关，曝光值则依管电压、焦片距和感光材料不同而异；

The water-model , noise-measure model and PE model were scaned separately with the same tube voltage and reduced the tube current step by step and scan .

固定管电压，分多级设置管电流分别扫描水模、噪声测量模型和PE模型。

Finally , in order to obtain the optimal value of tube voltage and current , the traditional climbing method is improved and the automatic extremum searching algorithm has been put forward in the dissertation .

最后，为了准确搜索到管电压和管电流的最佳值，对传统爬山法进行了改进，提出了本文自动极值点搜索算法。

The relationship between X-ray energy and ray attenuation coefficient is . analysed in order to find out roughly the quantitative relation between the tube voltage of X-ray machine and ray attenuation coefficient .

分析了射线能量与射线衰减系数的关系，试图找出管电压与射线衰减系数间的粗略定量关系。

There exist several parameters in X-ray digital imaging system to be determined including focal length , tube voltage , stacking frames . Reasonable parameters have been adopted by using the optimal transmission parameters selecting approach .

X射线数字成像系统获取图像中存在多种参数，包括焦距、控制管电压、叠加帧数，本文依据最优透射参数选择理论，设计选择了合理的参数。

Results Surface doses were found to be decreased with increasing the X-ray tube voltage when air kerma was varied between 1.1 μ Gy / frame and 4.0 μ Gy / frame .

结果无论比释动能为1.1μGy/帧还是4.0μGy/帧，表面剂量随着X线管电压的增加而降低。

According to the concept of linear-fitting correction , the correction factors for correcting the test - piece image are obtained by reference images and their corresponding means captured at fixed tube voltage and different tube current .

此方法基于线性拟合校正的思想，在一定管电压下，改变管电流采集一组探测器基准图像，利用这组图像与其相应均值进行拟合，再把拟合系数作为校正因子对试件成像进行校正。

The pixel value was kept relatively constant with air kerma of 4.0 μ Gy / frame and increased with air kerma of 1.1 μ Gy / frame when X-ray tube voltage was increased .

当比释动能为4.0μGy/帧时，随着管电压的增加，像素值保持相对的恒定，而当比释动能为1.1μGy/帧时，像素值却逐渐增加。

Another , several parameters affecting spectral lines such as the x-rays tube voltage and x-ray tube target materials , target angle , target thickness , target radius are simulated through the established low-energy x-rays radiation device model .

另外通过建立的低能X射线辐射装置模型模拟了管电压及X光管的靶材料、靶角度、靶厚、靶半径等参数对能量谱线的影响。

Experimental results show that when attenuation data contains Poisson noise with 1 % standard error , for tungsten anode with tube voltage 35 kV and 45 kV the error of the reconstruction is 4.03 % and 2.92 % respectively ;

实验表明，当衰减数据含有标准差为1%的泊松噪声时，钨靶在35kV和45kV球管电压下，重建光谱的误差分别为4.03%和2.92%；

This paper illustrates the relationship of exposition time and tube voltage in the process of using X-ray to probe the internal flaw of the workpiece and proposes an general method for choosing the exposition time by different thickness of the workpiece .

本文针对X射线探伤中曝光时间与管电压的关系以及曝光时间在探伤中的实际意义做了详尽分析，并提出了对于不同厚度的零件如何选择曝光时间的原则。

The plasma jet device is obtained by inserting the rod high voltage electrode to the tube high voltage electrode in the tube-ring electrodes plasma jet device .

该等离子体射流装置是在管-环式电极结构等离子体射流装置的管状高压电极里插入一根针状高压电极所得到。

The Influence and Test on the Field Effect Tube 's Pinch-off Voltage

场效应管夹断电压的作用及测试

Objective To observe the changes of chest images in multi-slice spiral CT low dose scan with the method to reduce tube current or voltage .

目的探讨将通过降低管电流或管电压来降低多层面螺旋CT扫描的X射线剂量的方式用于胸部，观察其影像图像质量的变化。

The method evaluated one channel 's response nonuniformity by testing the characteristics of its photodiode and scintillator varying with tube current and voltage respectively .

该方法是通过测试组成通道的光电二极管和闪烁体分别随管电流和管电压的变化特性来评价该通道的响应不一致性的。