Doctor insights on:
How Much Radiation Do You Get From A Ct Scan
Ct uses xrays taken an 360 degrees combined with a computer to see"inside" the body. The table moves as the xray tube and detectors spin around the patient 10 times a second or more! The image shows excellent soft tissue detail, enhanced with injection of intravenous contrast or oral contrast. This way the body is shown in slices, in any plane, usually axially, but ...Read more
How would I know how much radiation I received on my recent CT scan when apparently they vary according to the scanner used/where you get it done?
Ask where done: Ask at the place where you had the scan done, they should have records of what they did and should be able to tell you how much radiation you were exposed to. ...Read more
When would CT scan cancer effects show up? If I received too much radiation as a result of CT scans, when would the cancer potentially show up? Could I get canncer in 10-20 years because of CT scan radiation?
Delayed, high dose: In general, ct scans do not by themselves cause cancer. You would have to have had dozens upon dozens to risk the development of cancer. Having said that, when radiation induced cancers development, they are usually in the field of radiation, and usually are sarcomas (soft tissue malignancies). Based on your age, you would have to have had hundreds of cts in a short time 15-20 years ago. ...Read more
Is it true a single CT Scan is comparable to the same amount of radiation you can get from a day at the beach? Is that a good example/analogy?
No --: More like a year on the beach. CT scans can be lifesaving, but give you a major blast of radiation. They should not be done routinely. ...Read more
Can you get to much radiation from CT scan? Can it kill you years later from cancer? How bad is to get CT scan at the age of 30yr. I had one chest ct.
Don't worry: The radiation exposure from a single chest ct is ver low and provides either very little or no additional risk. ...Read more
I have some right superior mediastrinal widening in chest x ray. Dr asking for CT san. I m worried about radiation from ct. Should I get CT scan?
Yes: You need to know what the widening is. Most time it is a vessel. Sometimes lymph nodes. The amount of radiation from one ct is minimal as long as the number of these studies is kept to a minimal amount. Of course that would depend on what they find. ...Read more
How long does it takes to get radiation induced cancer? Should I worry after 5 to 10 years as I had on chest CT scan month ago with 4.8msv dose?
May not even happen: The average ct scan in the us exposes us anywhere between 3 and 10 msv. A dose of 10 msv increases the risk of getting any cancer by 0.1% and the risk of fatal cancer by 0.05%. According to the national research council and the U.S. Fda, any person has a 20% risk of dying from cancer in their lifetime. One ct scan of 10msv would increase the chance to 20.05%. Not a big risk. Don't worry too much. ...Read more
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
I'm trying to understand how much radiation a CT scan has. I've had two, but no more. Can it be average per say to have two and still be ok? Fearcancer
Do not worry: While CT scans do expose a person to radiation, the information gained is usually worth the slight risk. There are many things you can do to safeguard your health, e.g., maintain healthy weight, exercise at least 150 minutes/week, take HPV vaccine, avoid excessive sun/UV exposure, no tobacco or alcohol. ...Read more
I had a CT scan done on my chest for the first time and was wondering if it's normal to have 4 images taken at once? Is that alot? To much radiation?
Not sure: What you mean by four images at once. Do you mean it was a 4 detector spiral/multi slice scanner? If so, then that is the way the scanner normally operates. Did they actually scan your chest 4 times? That would be unusual. Did they do 4 sets of reconstructions after the scan? That is normal post processing from data obtained from a single scan. Can you be more specific? ...Read more
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
Low: The technicians know how to properly control the radiation levels that you would be receiving. ...Read more
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
I'm a 30 year old male. I had one CT scan done without contrast and now have to do one with contrast, is this a dangerous amount of radiation?
Benefit ;: Risk depend on indication for studies. We tend to select who to do both. Many scans are now low dose. It's best to have a family doctor that knows you and decides when to do ct's rather than er which does more. The risk is population based, trivial increase for individual (1 in 10 thousand to 2/10k). ...Read more
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
A cat scan is a fairly safe procedure.
A single exam to a part of a body does not have significant risk as far as radiation exposure.
An exam using IV contrast has a slight risk for contrast reaction. Serious reactions are quite rare. If you have a significant allergic history (significant allergic response to multiple things) your risk is slightly greater. ...Read more
If a CT scan is started and stopped due to jewelry, when it restarts am I exposed to double radiation levels?
Not necessarily: You may get some extra radiation but are unlikely to get twice the dose. ...Read more
In case of ct scan related radiation exposure why is it said that life time effects are cumulative when even a single scan carries risk.
Can't undo damage.: There are 2 biological effects of radiation: the 1st is random DNA damage - any stray radiation can permanently alter DNA & cause a mutation (cancer). The 2nd is "radiation sickness". Every organ has a lifetime limit of radiation that it can absorb; beyond the threshold, damage continues to mount. For the 2nd type, the time between radiation exposure doesn't matter, only the total lifetime dose. ...Read more
During CT scan I was directed by machine to hold breath 4 times. Does it mean 4 scans were done i.e. I was exposed to radiation 4 times?
During many types of CT scan, the patient will be instructed to hold their breath at times. The reason is to stop the heart/lungs/chest from moving up and down during imaging.
A complete CT typically has several imaging sequences. The amount of total radiation is the sum of the images necessary for a study. It is likely that you were receiving some X-rays during each breath hold. ...Read more
I am scheduled for my 6th ct scan within 1 year. I've heard that the radiation you are exposed to is high but how high exactly? I am only 19.
Scan: Excess scanning is never good but I do not until why you require 6 CT scans within a year? ...Read more
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
Depends: I depends on how old you are when you get the scan. The younger you are and the more scans you get the higher the risk. Some studies say there is significant risk for white blood cell cancers. A one off scan is unlikely to cause cancer in itself but it not entirely risk free. If there is a good reason to do the test it would have to be balance against the risk of the scan. ...Read more
How long does it take for radiation to harm the body after a CT scan? Safe medication to filter out radiations?
Is it true that CT Scan has 5x more radiation than xray? And is there anyway I could detoxify the radiation accumuated in my body?
Much more radiation: Ct scans provide radiation dose 100--250 times higher than a chest x-ray.. Ct scans use far more radiation than conventional x-rays and estimated responsible for 70% of medical radiation. Increased cancer risk associated. There is no way to detoxify radiation. CT scan has to be really indicated and there should be no other way of making diagnosis Benefit vs. Risk should be weighed. ...Read more
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