F52-8C程控X线机灯丝增温异常的原因分析与解决方案设计

目的:为了顺利解决F52-8C程控X线机程序提示灯丝增温异常的故障。方法:通过对F52-8C程序检测灯丝增温异常的原理分析,结合长期对该故障的跟踪维修,总结设计对此故障的维修解决方案,为类似故障维修工作提供参考和依据。结果:成功设计了F52-8C程控X线机灯丝增温异常的故障解决方案。结论:该解决方案设计经过实践检验可行性较强,方案条理清晰,既有故障维修的普遍实用性,又有对该故障较强的针对性。     

X线电视图像干扰分析及对策

影响X线电视图像最令人棘手的问题之一就是干扰。干扰不仅使X线图像质量变坏，而且直接影响到临床诊断。正确区分和寻找干扰的来源及类型，是解决图像干扰的根本方法。干扰信号对图像的影响表现为多方面，笔者根据教学与实践经验，将干扰分为外界干扰和内部干扰两大类，其故障现象是，图像上出现一条或几条上下滚动的水平黑带。亚外界干扰及解决对策外界干扰多是由X线电视系统工作环境周围强大电磁场、电磁波，通过电视系统的引线、元件脚、电容及电感混入到视放电路。由于我国采用50HZ的场扫描制式，当干扰信号频率为SOHZ的正整数倍时…     

中高频X线机高压变压器偏磁故障的分析与处理

１故障现象北京万东ＺＦＳ３０２ -１型高频Ｘ线机高压发生装置 ,透视时正常 ,摄影时无Ｘ线发生而且电源保险丝熔断。２高压电路工作原理ＺＦＳ３０２ -１型Ｘ线机控制台采用高频逆变方式产生高压 ,最高逆变频率８ＫＨｚ左右 ,ＰＦＭ（ＰｕｌｓｅＦｒｅｑｕｅｎｃｙ Ｍｏｄｕｌａｔｅ :脉冲频率调制）方式 ,触发脉冲频率越高 ,产生的ＫＶ越高。其主逆变电路如下所述 ,３８０Ｖ交流电压经三相硅桥整流、滤波产生５３０Ｖ直流电压加在可控硅ＶＴ１—ＶＴ４两端 ,触发端为来自采样调整电路的触发脉冲。当触发脉冲加到ＶＴ１、ＶＴ２触发端时 ,…     

数字化X线胸部摄影管电压选择对影像质量影响的研究

Objective To study the relationship between the selection of tube tension in digitalchest radiograph and image quality.Methods When tube current was fixed at 4 mAs, the choice of X-ray tube voltage changed from 60 to 120 kV.CDRAD2.0 contrast details phantom and normal human chest were exposed by X-ray system with 7 kinds of tube voltage (the difference between tube voltage was 10 kV) ,and the X-ray incidental dose of phantom surface was measured.Five radiologists with 3 years working experience evaluated the image quality on monitor and calculated the image quality factor (IQF) and image reading score.Statistics analysis was then performed by using ANOVA test and t test.According to the results, the optimum tube voltage range was determined.Results (1) The incidental dose of phantom surface increased with the higher tube voltage.(2)When the tube voltage was changed from 60 kV to 120 kV, the IQF value observed in CDRAD2.0 phantom image on monitor was 75.0±10.4,57.1±6.4,52.7±2.5,47.9±4.5, 46.0±3.8,46.0±2.8,45.2±3.5 ,there was significant statistical differences between groups(F=19.10, P<0.01).(3)The integrated score of the chest image quality in the tube voltage 90 kV and 120 kV were 12.4±0.9 and 13.0±0.7, respectively, and there was no statistical difference between two groups(t= 1.500,P>0.05).Conclusions (1)With the increase of tube tension,the display capacity of display device gradually strengthened.When the tube tension exceeded 90 kV, the increase of image quality on monitor was not evident.(2) With proper radiation dose, the value of tube tension in digital X-ray chest photograph was about 90 kV.     

TUR·D350mAX线机束光器故障的修理

我院一台TUR.D350mA X线机,在使用过程中发现束光器束光板有故障。经过电路分和对析机械传动的观察,找到了原因,经适当处理,故障消除。现将分析处理情况介绍如下。一、故障现象开机后胸透、点片摄影一切正常。拨动束光器视野调整开关,发现     

用观察者操作特性曲线探讨中频和工频X射线机对影像质量的影响

X射线片的影像质量评价是国内外放射界十分重视的问题，影像质量评价有主观评价法、客观评价法及主客观结合的综合评价法。而X射线片的影像质量如何，不仅取决于操作者的实际工作经验，更重要的是取决于机器成像性能参数、机器的调制传递函数（modulation transfer function，MTF）和设备系统的观察者操作特性曲线（receiver operating characteristic curve，ROC）。笔者重点通过实验方法研究比较中频和工频X射线机照射剂量；并用ROC曲线评价方法，探讨中频和工频X射线机性能对X射线照片影像质量的影响，现将实验结果叙述如下。     

高千伏摄影附加滤过与皮肤入射剂量相对关系的实验研究

目的：通过测量不同滤过条件下，体模入射剂量随滤过条件的变化确定高千伏X线摄影时的最佳附加滤过。材料与方法：利用X线剂量仪测量不同Al滤过时对应体模表面剂量的变化。结果与结论：通过适当增加附加滤过可以合理降低被检者皮肤剂量，120kV摄影时，附加滤过2.5mmAl是恰当的。     

XG－500型X线机灯丝加热电路的改进

ＸＧ－５００型Ｘ线机灯丝加热电路的改进泰山医院放射系曹允希，林庆德（２７１０００）新汶矿务局协庄煤矿医院张秀文我院九二年购进一台ＸＧ－５００双床双管遥控遥篮诊断Ｘ线机。用平床Ｘ线管做头颅、胸、腰椎和骨盆摄影仅一年时间，Ｘ线管大焦点灯丝烧断，一只管子报...     

数字化X线胸部摄影管电压选择对影像质量影响的研究

Objective To study the relationship between the selection of tube tension in digitalchest radiograph and image quality.Methods When tube current was fixed at 4 mAs, the choice of X-ray tube voltage changed from 60 to 120 kV.CDRAD2.0 contrast details phantom and normal human chest were exposed by X-ray system with 7 kinds of tube voltage (the difference between tube voltage was 10 kV) ,and the X-ray incidental dose of phantom surface was measured.Five radiologists with 3 years working experience evaluated the image quality on monitor and calculated the image quality factor (IQF) and image reading score.Statistics analysis was then performed by using ANOVA test and t test.According to the results, the optimum tube voltage range was determined.Results (1) The incidental dose of phantom surface increased with the higher tube voltage.(2)When the tube voltage was changed from 60 kV to 120 kV, the IQF value observed in CDRAD2.0 phantom image on monitor was 75.0±10.4,57.1±6.4,52.7±2.5,47.9±4.5, 46.0±3.8,46.0±2.8,45.2±3.5 ,there was significant statistical differences between groups(F=19.10, P<0.01).(3)The integrated score of the chest image quality in the tube voltage 90 kV and 120 kV were 12.4±0.9 and 13.0±0.7, respectively, and there was no statistical difference between two groups(t= 1.500,P>0.05).Conclusions (1)With the increase of tube tension,the display capacity of display device gradually strengthened.When the tube tension exceeded 90 kV, the increase of image quality on monitor was not evident.(2) With proper radiation dose, the value of tube tension in digital X-ray chest photograph was about 90 kV.     

医用诊断X线机自动曝光系统的研制

本文研究的是用于医用诊断X线机自动曝光控制系统。采用该系统可以自动控制X线胶片的曝光量 ,达到合适的照片密度 ,提高了照片质量 ,降低X线照片废片率。可以方便地安装在不同型号的X线机上。