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film mottle
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In this paper the principle and method of testing of RMS(Root Mean Square )graininess of radiograph were described.Two kinds of filrnscreen systetms:CaWO/Fuji and BaFCl:Eu / Fuji,were tested.The results indicated the RMS value of BaFCl Eu /Fuji system was greater than that of CaWO/Fuji system under the same condition,In addition,the RMS values of both systems increased with increase of X-ray tube voltage. The authors discussed the causes of graininess on a radiograph.This study together with related reports...

In this paper the principle and method of testing of RMS(Root Mean Square )graininess of radiograph were described.Two kinds of filrnscreen systetms:CaWO/Fuji and BaFCl:Eu / Fuji,were tested.The results indicated the RMS value of BaFCl Eu /Fuji system was greater than that of CaWO/Fuji system under the same condition,In addition,the RMS values of both systems increased with increase of X-ray tube voltage. The authors discussed the causes of graininess on a radiograph.This study together with related reports indicated that an effective way of controlling film mottle was to refrain from usmg too high tube voItage and too big intensifying screen factor which translated into too small mAs value.

作者介绍了X线照片均方根值(rootmeansquare,RMS)粒状度的测试原理及方法。对Ca-WO_4/Fuji和BaFCI:Eu/Fuji两种屏胶系统在不同条件下的RMS值进行了测试。结果:在同一条件下,稀土增感屏BaFCl:Eu/Fuji胶片系统的RMS值大;随着管电压的升高,两种屏胶系统的RMS值都增大。作者对产生X线照片RMS粒状度的原因进行了讨论。本研究结果并结合有关文献表明:控制X线照片斑点的主要措施是管电压不要过高,所用稀土增感因数不宜过大,即所用mAs值不宜过小。

 
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