CT问世之初就开展了双能量成像的探索,但由于早期CT设备空间分辨率低、CT值不稳定以及扫描时间长阻止了该技术的普遍应用。另外,低管电压时的球管技术也不能提供足够的管电流以取得与高管电压相对应的足够的量子输出。利用单源CT,在双能量水平的螺旋数据必须进行二次独立采集,? CT began its exploration of dual-energy imaging, but its widespread application was hindered by the low spatial resolution of early CT equipment, the unstable CT value, and the long scan time. In addition, the bulb technology at low tube voltage also fails to provide sufficient tube current to achieve adequate quantum output corresponding to the high tube voltage. With single-source CT, helical data at dual energy levels must be collected twice independently,