Is ct scan harmful to body?

Like all x-ray imaging technologies, in the CT scan, the patient receives a dose of radiation in the x-ray range of the spectrum. Compared to simple 2D x-ray images, one would call this a CT scan a high radiation technique. As with all such technologies, the exposure decreases as the technology improves and it is considerably lower now than a decade or two ago. While a single CT scan is not considered dangerous, it would not be considered wise to have a hundred of them. And, as with all radiation, the risk is not zero and it becomes a matter of opinion as to what is an acceptable level of risk.