Swallowed object x-ray question
Thank you for your question, and we can certainly understand your concern because it is widely known that x-rays can carry some risk. Medical physicists strive to make the best practical use of radiation in medicine while minimizing the risk of harm, and to provide education like this about the physics of medical radiation.
Radiography is the most common use of ionizing radiation in medicine because it provides detailed information about internal anatomy while using very small amounts of radiation. It is also quick, inexpensive, non-invasive and painless for patients. When you brought your child to the doctor for suspicion of swallowing a foreign object, it makes perfect sense that a radiograph of the full digestive track was performed.
Infants and small children, because of the small size and relatively soft anatomic structures, are more “transparent” to radiation than older children and adults. For this reason, x-rays of babies and small children use a small fraction of the radiation needed to obtain the same type of x-ray image than a full-grown adult. To determine an estimate of the radiation dose that your child received from imaging performed at a local hospital or clinic, it is recommended that you ask the facility to put you into contact with the medical physicist who services that facility. That physicist is in the best position to assess the radiation dose used for any individual examination.
Although we do not know the radiation dose of this exam, we can make some general statements about radiation risk. The biological risk from a single radiographic image is exceedingly small and may even be non-existent. There is some data suggesting that the risk of harm at the low radiation doses used for radiography is actually zero because the body is capable of repairing the DNA damage caused by radiation at low dose rates. Whether the risk is extremely small or zero is simply not known at this time. The take-home message for patients (and for the parents of patients) is that if information will be obtained from the image to help manage the patient’s health today, then in the majority of cases it is worth the extremely small (and possibly non-existent) risk of harm in the future.
In this specific case, as a parent you were justifiably concerned that your child swallowed something that might have put their health at serious risk. The x-ray revealed that there was no foreign object present. This “negative” result benefitted both the child and the parent by avoiding any further unnecessary testing and treatments, and by relieving you of your anxiety about it. The radiation dose used to obtain the image was extremely small, as are any future risks from this procedure.
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