X射线影像对比度细节体模的设计

为了评价医用X射线摄影影像质量,设计及制作了一种对比度细节体模。利用X射线透过物质时其透过剂量随物质厚度的增加呈指数减弱原理,在与肌肉组织对X射线减弱特性基本等效的有机玻璃板上加工不同大小和深度的圆孔而制成。对比度细节圆孔在对比度阈值区域精密分布,对比度细节从0.3～80.0mm,同时提出了对比度细节体模影像质量指数的计算方法及体模的应用。该体模使用方便,指标计算简单,适合对X射线影像质量的对比度及空间分辨率的综合评价。

Design of contrast details phantom for X-ray image

In order to evaluate the quality of medical X-ray photography image,the authors design and manufacture a contrast details phantom.The phantom has been prepared with the principle that the transmission dose of X-ray decrease with increasing the material thickness according to an exponential relationship,and with organic glass different size and depth of round hole,which has almost the same characteristics of X-ray abate as that of muscle tissue.The contrast details round holes from 0.3 mm to 80.0 mm distribu...