高kV摄影概念的临床研究

Clinical study of High-kV radiography concept

目的 对高kV摄影的概念从临床角度作新的评价。方法 采用Philips 500mA、国产300～500 mAX线机,2～8 mAs;kV则依据不同摄影部位的厚度结合平片摄影条件(PE值)并参照Philips(E)量表换算确定。结果 胸部(幼儿、小儿和成人)、头颅和四肢等部位照片质量均在良好以上。结论 高kV摄影的新概念应是随着焦-片距(D)的不同将kV与mAs的转换,即提高kV、降低mAs,而不是以120 kVP以上直至350 kVP为定论值。

Objective To evaluate High - kV radiography concept again with the clinical view. Methods Philips 500 mA and China - made 300 - 500 rnA X - ray machines were used. The value of electric current was 2-8 mAs. The voltage was determined by the thickness of variors parts of the radio graphy combined with the film condition and referring to the Philips table. Results The film quality of thoracic spine (infant, children and adult), skull and extremity etc was better. Conclusion The new concept of High - kV radiography snould be the conversion of voltage with electric current. That is to reduce the kV and to rise the mAs. And it is mot according with the voltage that is 120 kV or high to 350 kV. There are two key factors of High-kV radiography kVP. The first factor is ascertainment and conversion of the focus - film distamce. The second one is to reduce the mAs and to. rise the kV according to PE value of the film. That is when the mAs half reduced the voltage increased about 10kV.