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To analyze and compare the radiation dose and image quality of different CT scanning modes on head-neck CT angiography. A total of 180 patients were divided into Group A and Group B. The groups were further subdivided according to different scanning modes subgroups A1, A2, A3, B1, B2, and B3. Subgroups A1 and B1 used conventional CT protocol, subgroups A2 and B2 used the kV-Assist scan mode, and subgroups A3 and B3 used the dual-energy gemstone spectral imaging protocol. The CT dose index and dose-length product were recorded. The objecti