The contrast agent having been injected, the abscissa of the time-density curve of the artery and the tissue in the dynamic CT image is the time, and the ordinate is the increased CT value after the injection.

• 注入对比剂后，动态CT图像中动脉及组织的时间-密度曲线的横坐标为时间，纵坐标为注药后增加的CT值，