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Does Exposure To CT Scan Radiation Cause Blindness?

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Posted on Mon, 23 Feb 2015
Question: I recently had a CT scan of my brain & MRI. They came back normal but am I at increased risk of blindness from radiation from CT or brain tumor?
doctor
Answered by Dr. Olsi Taka (30 minutes later)
Brief Answer:
No blindness risk, radiation very small.

Detailed Answer:
I read your question carefully and I understand your concern, it is wise to consider the possible effects of the many tests available these days.

However you don't have much to fear. Blindness is not a possibility at all either from CT or MRI.

MRI actually doesn't carry any harmful radiation at all, no X-rays are involved and there are no known negative effects.

CT is based on x-ray radiation and in theory radiation is related to an increased possibility of cancer. But that added risk is very very low, especially with today's modern machines. Just to give you an idea for an average head CT it has been calculated that the extra lifetime risk of developing cancer subsequently is only 1 in 9000 (the risk of a person having cancer in a lifetime in general is 1 in 5, so that extra 1 in 9000 is pretty negligible).

So you should be relieved they came back normal and not pay much thought to the negative effects of exams.

I hope to have been of help.
Above answer was peer-reviewed by : Dr. Raju A.T
doctor
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Follow up: Dr. Olsi Taka (5 hours later)
Can ct scan cause radiation burn?
doctor
Answered by Dr. Olsi Taka (4 hours later)
Brief Answer:
No none of that, no worry.

Detailed Answer:
No the CT doesn't cause any such thing. CT is basically a common radiography, it's just that several of them are taken at different position and the computer produces several images of different layers of your brain.
No reason to fear any burn.

Wishing you good health!
Above answer was peer-reviewed by : Dr. Prasad
doctor
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Follow up: Dr. Olsi Taka (2 days later)
Am I at increased risk for cancer fromCT radiation?
doctor
Answered by Dr. Olsi Taka (38 minutes later)
Brief Answer:
Negligible risk.

Detailed Answer:
As I said before the added risk is very very small, negligible.

For a head CT there is only a 1 in 9000 extra risk to have cancer in a lifetime, so as you can see it's insignificant, 0.01%.

I hope to have been able to ease your concerns.
Above answer was peer-reviewed by : Dr. Prasad
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Answered by
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Dr. Olsi Taka

Neurologist

Practicing since :2004

Answered : 3673 Questions

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Does Exposure To CT Scan Radiation Cause Blindness?

Brief Answer: No blindness risk, radiation very small. Detailed Answer: I read your question carefully and I understand your concern, it is wise to consider the possible effects of the many tests available these days. However you don't have much to fear. Blindness is not a possibility at all either from CT or MRI. MRI actually doesn't carry any harmful radiation at all, no X-rays are involved and there are no known negative effects. CT is based on x-ray radiation and in theory radiation is related to an increased possibility of cancer. But that added risk is very very low, especially with today's modern machines. Just to give you an idea for an average head CT it has been calculated that the extra lifetime risk of developing cancer subsequently is only 1 in 9000 (the risk of a person having cancer in a lifetime in general is 1 in 5, so that extra 1 in 9000 is pretty negligible). So you should be relieved they came back normal and not pay much thought to the negative effects of exams. I hope to have been of help.