The radioactive concentration of lesion pixel depended on the pixel counts, the acquisition time and CF, and the relationship was expressed with an empirical formula.
②由图像像素的累积计数、 采集 时间及定标系数确定像素的放射性浓度 ，其关系可以一经验公式表示。
2
Mathematical relationship between Rn daughter concentrations and ventilation, adhesion and deposition, and radioactive decay was developed in the paper.