5 doctors weighed in:

Can Ct Scan damage brain , effect activity of brain?

5 doctors weighed in
Dr. Paul Garrett
Radiology
3 doctors agree

In brief: No

The x ray radiation in a CT has no measurable or known effect on neural tissues.
1) dose is way too low and 2) nerves are relatively radioresistant since the cells don't reproduce very fast, if at all. There is a theoretical risk of cataracts and cancer years later, but this is incredibly small esp. for a single scan and controversial anyway.

In brief: No

The x ray radiation in a CT has no measurable or known effect on neural tissues.
1) dose is way too low and 2) nerves are relatively radioresistant since the cells don't reproduce very fast, if at all. There is a theoretical risk of cataracts and cancer years later, but this is incredibly small esp. for a single scan and controversial anyway.
Thank
Dr. Daniel Clayton
Neurosurgery

In brief: Unlikely

The amount of radiation in a single CT scan of the head is minimal and will not affect the activity of the brain, nor damage it structurally.
The cancer risk is estimated to range from 0.05% (child) to 0.01% (adult) for a single CT of the head. Repeated exposure to radiation can affect the brain, and does increase the cancer risk. reference: http://www.nejm.org/doi/full/10.1056/NEJMra072149

In brief: Unlikely

The amount of radiation in a single CT scan of the head is minimal and will not affect the activity of the brain, nor damage it structurally.
The cancer risk is estimated to range from 0.05% (child) to 0.01% (adult) for a single CT of the head. Repeated exposure to radiation can affect the brain, and does increase the cancer risk. reference: http://www.nejm.org/doi/full/10.1056/NEJMra072149
Thank
1 comment
Dr. Paul Garrett
Dr. C.: Thank you so much for the good review article in the NE Journal from 2007. In the last year or two new computer algorithms are in use in many centers to vastly reduce dose in CT and it behooves patients to ask their Drs. if they can expect low dose techniques to be used. As Dr. C correctly points out, this is esp. true for kids and repeat users. Again, great post Dan.
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