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Doctor insights on: Is Getting A Second Ct Scan Within A Year Too Much Radiation

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

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

Dr. Louis Gallia
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Computed Tomography (Definition)

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


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Is getting a second CT scan for post-surgery seroma evaluation, within 4 months too much radiation?

Radiation from: Ct scans is a larger amount than say, a typical x-ray would have. However, most doctors would not indiscriminately order these tests without a need for the valuable information they may provide. One needs to weigh all risks and benefits before ordering tests. Speak with your doctor if you are concerned about radiation exposures. ...Read more

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Radiology Does a PET scan have a much better chance of picking up a central lung cancer if it was missed at LDCT? Thank You

Radiology
Does a PET scan have a much better chance of picking up a central lung cancer if it was missed at LDCT? 
Thank You

LDCT is a : noncontrast lung nodule screening study, and it is possible that small central lesions may not be visualized due to proximity to normal blood vessels or other structures. PET is extremely sensitive, but if a diagnostic contrast enhanced CT scan with thinner collimation and higher resolution is negative, probably unnecessary. ...Read more

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Is a one-year-old abdominal CT scan that detected Nutcracker syndrome too old to look at for a second opinion ?

Is a one-year-old abdominal CT scan that detected Nutcracker syndrome too old to look at for a second opinion ?

Not too old: Second opinions can be given on any study. If your symptoms have gotten worse, then a newer study may show more disease, but the old study may still contribute some information to the diagnosis. You can contact me on my profile by pressing Send Message to start a consult. ...Read more

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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

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I had a tac scan last month for bones, and am due a scintascan for my kidney next month, is this too much radiation in a short space of time?

I had a tac scan last month for bones, and am due a scintascan for my kidney next month, is this too much radiation in a short space of time?

Risk vs. benefit. : Radiographic studies are usually requested when the benefit of the study out weighs the risk of the exam. If you are concerned about the amount of radiation, have your doctor discuss this with the radiologist, who can get a radiation physicist to get a better calculation of the cumulative dose which can further be discussed with your md/radiologist. ...Read more

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So there really isn't that much more risk of developing cancer if you've had a barium swallow and get a chest ct scan done?

So there really isn't that much more risk of developing cancer if you've had a barium swallow and get a chest ct scan done?

True: The amount of radiation one receives from those two studies is very small altogether. Although certainly any radiation carries some risk, the amount here is minuscule. The chances of getting cancer from this are almost nil. Hope this helps. ...Read more

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If one had a Cardiac CT for Calcium Scoring in a 256 or 320 slice CT vs a 64 slice CT, is that somehow better for this test? Is it lower radiation?

If one had a Cardiac CT for Calcium Scoring in a 256 or 320 slice CT vs a 64 slice CT, is that somehow better for this test? Is it lower radiation?

Cardiac CT: The advantage to the more slices in a CT is for imaging fine detail. The 64 slice is quite good, the others have some advantages. For calcium scoring however, the higher slice resolution is not really needed. For coronary anatomy, the higher slice adds resolution. Radiation exposure has multiple components in technique but the greater slice number can theoretically let one get less exposure image ...Read more

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Bad when a pet scan takes a long time? My grandfather's pet scan was only scheduled to take 1 hour, but instead it took 4 hours. Is that a bad sign? It was the second pet scan he had after the first showed a malignant tumor.

Bad when a pet scan takes a long time? My grandfather's pet scan was only scheduled to take 1 hour, but instead it took 4 hours.  Is that a bad sign? It was the second pet scan he had after the first showed a malignant tumor.

Not a bad sign: Generally, if a pet/ct scan takes longer than 1 hour, it is for technical or patient motion reasons. The camera might have had a problem, or the patient may have moved and part of the scan repeated, or more of the body (legs) imaged. Of course, after the initial injection of f-18 fdg, the patient should wait 1 hour for the drug to accumulate in the tissues and clear from the bloodstream. ...Read more

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How risky is an abdominal CT scan for a 34 year old male? Starting to get nervous after reading a lot of material online.

How risky is an abdominal CT scan for a 34 year old male?  Starting to get nervous after reading a lot of material online.

Very safe: Ct of abdomen is very safe, radiation exposure is negligible, if contrasts are used , only worry is reaction to contrast material. ...Read more

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Is a chronic subdural hematoma detected by CT scan important or just a normal occurance in a 83 year old that hit head 3 days prior to scan?

Is a chronic subdural hematoma detected by CT scan important or just a normal occurance in a 83 year old that hit head 3 days prior to scan?

Chronic > 3 days: "Chronic" means that the bleeding began a few wks after injury. Thus, it is less likely that the hit to the head 3 days prior to the head CT caused the "chronic" subdural hematoma (SDH). SDH and head trauma are risk factors for seizures and other conditions. The patient should be closely monitored and see a neurologist for evaluation. http://www.nlm.nih.gov/medlineplus/ency/article/000781.htm ...Read more

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Should I worry about amount of radiation from a CT scan for a pulmonary embolism study?

Radiation concern: It is always reasonable to be concerned about radiation exposure, but you have to keep it in perspective of the risk of the disease being considered. One ct scan is not a lot of radiation, while a pulmonary embolism can cause death. The risk to benefit would favor having the ct scan. ...Read more

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Will a cat scan of my head rule out MS or a brain tumor better than mri? Had one before but am having another one due to vertigo.Im 18.Am i in danger?

Will a cat scan of my head rule out MS or a brain tumor better than mri? Had one before but am having another one due to vertigo.Im 18.Am i in danger?

No: Mri is by far the test of choice for ms. Either way will detect brain tumors, but actual better picture of the tumor itself with a mri. There is no danger to mri. Cat scans have radiation, but your doctor will guide you in consultation with a radiologist as to which test is most appropriate for your symptoms. ...Read more

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I've had a neck ct scan and four x-rays and a hida scan? I'm worried about the radiation exposure... Should I? All in the past year, I'm a 34yr F.

I've had a neck ct scan and four x-rays and a hida scan? I'm worried about the radiation exposure... Should I? All in the past year, I'm a 34yr F.

CT scan; not the Xra: CT scans involve ~400 times more radiation exposure as Xrays, & so if u worry abt unnecessary radiation risk, limit CT scans. HIDA & Xrays involve so little radiation that u prob got as much from walking outside in 1 yr as u got from those tests. At 34, most of ur organs have developed, so there's no immediate threat; however, there's a lifetime radiation limit. Too much testng will catch up 2u@80 ...Read more

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I had 2 CT scans within a month after two hard hits to the head. Is this dangerous in terms of radiation? Never had one before.

I had 2 CT scans within a month after two hard hits to the head. Is this dangerous in terms of radiation? Never had one before.

Radiation exposure: Yes, you were exposed to radiation, but I am sure that your doc considered the tests necessary and the overall exposure is low. ...Read more

Dr. Michael Gabor
1,896 doctors shared insights

Ct Scan (Definition)

Computed tomography (ct scan) or computed axial tomography (cat scan), is a medical imaging procedure that utilizes computer-processed x-rays to produce tomographic images or 'slices' of specific ...Read more