Brain CT is an examination of the cranial brain using CT, and the examination time is related to the patient’s specific examination type and the model of the machine. 1, simple cranial CT flat scan: the examination time required is generally 3-5 minutes, some people have a slightly larger cranial profile, so the scanning range is larger and the scanning time is relatively longer, and some people have a slightly smaller cranial profile and the scanning time is relatively shorter; 2, enhanced examination or vascular examination: the examination time is longer The CT scan usually takes 7-8 minutes because the enhanced examination requires scanning the patient’s arterial phase and venous phase, and the examination process also produces a delay. In addition, different CT machine models, the required examination time is different, the better the examination machine scanning time is shorter, the current lowest double-row spiral CT cranial scan time is positioning like 3 seconds, axial image scanning adult delay of 3 seconds plus scanning time of about 50 seconds, the total scanning time is close to 1 minute. And high-end machine scanning time of a dozen seconds can be.