【摘要】 目的探讨旋转阳极在照射野面的短轴方向的线量分布。方法将14×17inch的胶片置于摄影床上,以照射野的中心点为中心,利用三角函数分别计算出数个中心线外倾角所对应的短轴两侧的距离,采用相同的曝光条件,在旋转阳极为高、低两种转速的机器上,进行曝光,冲洗并采用密度计测量。结果高、低两种转速的旋转阳极X线机,在照射野面的短轴方向,比较对称点密度值,外侧缘大于内侧缘,峰值在中心点偏外侧缘。结论在旋转阳极照射野面的短轴方向,X线照射量的分布发生偏离,最大线量位于中心点偏外侧缘。更多还原

【Abstract】 Objective To explore the X-ray distribution of rotating anode in the X-ray short axis of radiation filed.Methods A film of 14 17 inch was placed on the couch.With the center point of radiation field taken as the center,trigonometric function was used to calculate the distance on both sides of the short axis corresponding to several external slanted angles.Under the same exposure conditions,the films were exposed in high and low rotation speed facilities and then rinsed,measured with densimeter.Results The density value was compared in the X-ray short axis of radiation filed on two different speeds of rotating anode X-ray machine(high-speed and low-speed).The density value was higher in the outside than the internal within the same distance from the field center,and the peak density appeared at the lateral side of the center point.Conclusion the X-ray distribution deviates on the short axis and has the maximum value at the lateral side of the center point.更多还原