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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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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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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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Expert opinions? Which has more radiation: bone scan or ct?

Expert opinions? Which has more radiation: bone scan or ct?

Sometimes same dose: Background radiation at sea level: 3 msv per year, denver residents get: 6 msv per year, cross country flight: 0.02 msv, x ray chest: 0.06 msv, ct head: 3 msv, ct chest: 5 msv (equivalent to 100 chest xrays) ct abdomen: 5-10, average bone scan 6.5 msv. Radiation depends on size of patient." radiation affects growing body in children more than adults. Doses to children are much less. ...Read more

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I have had 3 ct scans of my lungs. Now I need one for headaches. Is this too much radiation? Scared.

I have had 3 ct scans of my lungs. Now I need one for headaches. Is this too much radiation? Scared.

You're fine: Each CT scan delivers radiation equivalent to being an airline pilot or flight crew member for a few months. Nobody's shown a measurable extra risk for cancer in these folks. If you need a scan, get it -- radiation is the least of your worries if you need a CT for headache. The prospect of brain disease is serious and I wish you a good outcome. ...Read more

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My doctor is requesting a CT scan should I be concerned about the radiation?

My doctor is requesting a CT scan should I be concerned about the radiation?

No...but: There is some radiation with a ct scan but this is relatively minimal and thus the risk of long term stimulation of cancer is very, very tiny. None the less anytime any extra radiation can be avoided that's a good thing, and surely your doctor had a good reason to order the test. Of course if you are pregnant or think you might be let your doctor know. Hope this helps. ...Read more

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Guck n simple 08-10 br ca chemo radiation mastectomy left breast CT scan 2wks ago enlarged nodes in mediastatin and nodes on right lung. Now what?

Guck n simple 08-10 br ca chemo radiation mastectomy  left breast CT scan 2wks ago enlarged nodes in mediastatin and nodes on right lung. Now what?

Biopsy and/or PET: Ct guided biopsy or mediastinoscopy with biopsy may be indicated. Pet may show increased areas of activity and oncologist may want to treat simply due to your history. Contact oncologist and surgeon. ...Read more

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How long do a CT scan send radiation into your body?

While: You are in the scanner and the images are being taken you are receiving a relatively small dose of radiation. Often this is less than a minute depending on what is being scanned. ...Read more

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Is getting a second CT scan within a year too much radiation?

Too much?: "too much" is a relative term. Basically no. If you have a medical condition, ie cancer that is being monitored by ct then the benefits outweigh the risks. If you are getting a ct for no reason then the risks (small but finite) outweigh the benefits. Any medical procedure is not a binary state. There is a continuum of risks and benefits. ...Read more

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What amount radiation do you get on a typical flight compared to a CT scan?

Radiation: A CT scan of the abdomen and pelvis results in about 300 times the radiation exposure of an average 10 hour flight. ...Read more

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How long is it supposed to it take for the radiation from CT scan to have harmful effect?

It depends, if ever.: The tissue damage done by radiation exposure is related to the dose, the age of the patient and the organs that receive the dose, as well as genetic factors relating to the patient. Also, the time between exposures is important. Almost any single ct exam of any one body part is exceptionally unlikely to cause any harm. The issue is repeated imaging of the same area, particularly in young patients. ...Read more

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Will having 2 full body CT scans totally 55mSv effect my future children? Does all of that radiation damage my eggs?

No, Not likely: Medical use of X-Rays such as CT scans is considered safe. Most people will have 2 or more body CT scans in their life time without any harm. The dose of radiation received by your body is not sufficient to cause any harm to your Ovaries. So it should not affect your fertility. ...Read more

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