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Doctor insights on: Cat Scans And Radiation

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What is the difference between an MRI and a cat scan? Except for the radiation factor.

What is the difference between an MRI and  a cat scan? Except for the radiation factor.

Physics: The physical phenomena on which these imaging techniques are built are very different, each is best suited for different purposes. Cat scans are sophisticated x ray, they rely on the degree of absorption of gamma rays (bones, ca, other metals will contrast most). Mri is better for softer tissue imaging because it depends more on the behavior of hydrogen atoms and h2o in the strong magnetic field. ...Read more

Gamma Rays (Definition)

This is light of extremely short wavelengths typically produced either among the stars / in cosmic rays or by radioactive element decay. Gamma rays form the background of normal radiation in which we all live; it is substantially greater than the exposure we get from imaging scans or should get from ...Read more


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4 ct scans in 5 months? Too much radiation?

4 ct scans in 5 months? Too much radiation?

The decision: to use diagnostic X-rays is a risk/benefit analysis. The theoretical risk of a CT scan is very low. If the CT scans were medically indicated, it wasn't too much radiation. If the CT scans were unnecessary, then it was. You can go to xrayrisk.com and calculate your theoretical increased cancer risk from the scans. ...Read more

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I have had 2 CT scans done in the past 4 years, what are my risks from that radiation?

Dependingscans done: Scans vary and some scan are very high dose and large volume. Others are small and of low volume. See this site: http://www.Xrayrisk.Com/calculator/calculator.Php good luck. ...Read more

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Had a lot of CT scans.My dr always told me, cells repair after exposure to CT. How is radiation cumulative? How is the damage cumulative? Thank you

Relax: While evidence-based physicians are required by the strictest laws to tell you the truth, it's actually profitable for charlatans to exaggerate, cynically, the dangers of today's medicine. The extra radiation you get from a CT scan today is equal to what you'd get from cosmic rays from living in Denver instead of Topeka for two months. The increased cancer risk isn't measurable. ...Read more

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Help please? How much radiation in a CT scan?

Help please? How much radiation in a CT scan?

Depends on what kind: The info provided on the chart if you go to the link below should be very helpful. It will show you the radiation dose for many different radiology exams. http://www.radiologyinfo.org/en/safety/?pg=sfty_xray. ...Read more

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Does the CT scan shows the radiation dose used in the scan in mSv?

Does the CT scan shows the radiation dose used in the scan in mSv?

10 mSv: A CT scan of the abdomen (belly) and pelvis exposes a person to about 10 mSv; this goes up to 20 mSv if the test is done twice (once with and once without contrast). ...Read more

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What to do about radiation poisoning from weekly-ish CT scans?

There is: nothing you can do about radiation you have already been exposed to. To calculate your theoretical risk, go to xrayrisk.com. Why are you getting weekly CT scans? That is fairly unusual. ...Read more

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