A single head ct can cause very little, almost negligible, harm to the body and generally has no significant effect on health.
The hazards of head ct on the human body mainly include x-ray radiation and adverse reactions after injection of contrast media. Head ct examination process, x-ray radiation is strictly controlled, a head ct scanning is about 2mSv, smaller radiation dose does not significantly increase the incidence of cancer, there is basically no significant impact on human health.
Adverse reactions after contrast injection mainly include allergic reaction and nephrotoxicity. At present, iodine contrast agent is mainly used in China, and some patients may be allergic to iodine. Contrast agent 90% through the kidney metabolism, may increase the burden on the kidneys, for patients with normal renal function, the impact is small. Generally before the examination, a detailed assessment and screening will be carried out on the examinee, and some patients with higher risk will be screened out.
Usually the impact of head ct on the human body are within the tolerable range, it is recommended that patients with the intention of examination under the guidance of the doctor reasonable and standardized examination.