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医用诊断X线管焦点的调制传递函数MTF值为评价X线管焦点成像性能的一重要参数。对具有焦点外辐射的焦点MTF计算方法以及焦点外辐射对焦点MTF的影响尚未见报道。本文结合实验研究和理论推导得到了焦点外辐射的焦点MTF计算公式,并对两X线管的四个焦点进行了测量研究。
Modulation Transfer Function (MTF) of Medical Diagnostic X-Ray Tube Focus is an important parameter for evaluating the focus imaging performance of the X-ray tube. The influence of focal point MTF calculation method with out-of-focus radiation and out-of-focus radiation MTF has not been reported yet. In this paper, the focal point MTF calculation formula of the out-of-focus radiation is deduced based on the experimental research and theoretical analysis. The four focal points of the two X-ray tubes are measured.