There is no threshold to as to what number of CT scans leads to cancer. In ypur case, each of the scanwaa necessary. Whenever a physician prescribes a test or investigation, he always counts benefits more than the risk and only thenit is forwarded. So what has happened cannot be reversed. It was necessary at that time. There are other avoidable factors that can cause cancer like smoking, alcohol, dyes, paints etc. Take precautions Worry wont help.

Benefits is more rather than risk

Hello sir. No specefic amount of a " dosage of radiation" causes cancer, it can be even due to an Xray or even mobile radiation. Yes, CT scan 3 times a year is undoubtedly high dose, but if the use is justified for diagnosis of fungal infection, I think its benefit will outweigh the risk. Hope this helps Regards Dr. Kshitij Singh

S exposure surely high,does not indicate it will surely cause cancer,it was for diagnostic purpose, avoid using laptop and  mobile  even that has high risk whr v use unnecessary with out any purpose