中文摘要：

目的：探讨X线管电压（kVp）与体模管图像质量和放射剂量之间的相关性。方法：在丙烯酸模板内制作25组直径为1．2mm的圆柱形平行排列的体模管，其间距为11mm。体模管内造影剂碘浓度为4．0～50mg／ml。获取X线图像后，采用曲线拟合的方法，研究不同X线管电压对体模管图像质量和表面剂量的影响。结果：当X线管电压从54kVp增加到85kVp时，体模表面剂量的变化较图像质量变化大；当超过85kVp后，体模表面剂量的变化不明显而图像质量却出现较大幅度下降。结论：在特定体模厚度下，通过建立并分析管电压与图像质量及体模表面剂量间的关系曲线，可以确定最优kVp值，既保证了图像质量又能使体模表面剂量最低。

英文摘要：

Objective： To study the correlation among X-ray tube voltage, image quality and radiation dose. Methods： Radiographic images were acquired by employing the phantom with 25 pairs of vessels containing iodine at concentration between 4.0～50mg/ml. Curve fitting was used to find and evaluate the correlation among X-ray tube voltage, image quality and surface dose of the phantom. Results： The decrease of image quality is less significant than that of surface dose while the tube voltage increased from 54 to 85kVp, and the decline of surface dose was not evident whereas the decline of image quality was substantial when the tube voltage increased over 85kV. Conclusion： On the basis of some specific thickness of phantom, the optimized value of tube voltage that both satisfy the image quality and the minimum surface dose of phantom can be obtained by means of curve fitting and studying the correlation among them.