In 2023, American hospitals and clinics carried out roughly 93 million CT scans, and a study in JAMA now projects that the radiation from those images could eventually lead to about 103,000 cancers among the people scanned. The figure is not a tally of illness already found but a reckoning of risk, drawn from how much radiation each scan delivers and what earlier generations exposed to radiation have taught us about its long shadow. It arrives as a reminder that a tool which has become almost routine in modern medicine carries a cost that is easy to overlook, even as it remains, for most patie
A JAMA Study Links 2023's CT Scans to Roughly 103,000 Future Cancers in the US
An estimated 103,000 future cancer cases, with children more radiation-sensitive, are projected from 2023 CT scans.
The concern is the growing volume of imaging, not the scan you truly need
Mark
Start with the number. What does 103,000 actually mean?
Mimi
It's the projected number of future cancers over the lifetimes of people who had CT scans in 2023. That year there were about 93 million scans in the US.
Mark
So these aren't people already diagnosed.
Luke
Right, and that matters. It's a modeled estimate, not a tally of cases. Nobody has counted 103,000 patients.
Mimi
The model uses dose per scan and risk figures drawn mainly from atomic bomb survivors and other exposed groups, adjusted for age, sex, and organs scanned.
Mark
Why does age matter so much?
Mimi
Younger patients, children especially, are more sensitive to radiation. Risk per scan is higher for them. But adults get most of the scans, so most projected cancers are in adults.
Luke
Worth noting the risk models come from other exposure situations and are applied to medical scans. The researchers included uncertainty ranges, but the article doesn't give them, so we can't say how wide the margin is.
Mark
And the 5% figure?
Luke
That's a conditional. If current practices persist, CT-associated cancer could reach 5% of annual new diagnoses. It's a warning about a trend, not a present measurement.
Mimi
And experts still say that for a needed scan, the benefit usually outweighs the risk. The concern is scans without a clear clinical need.
El Pulso
- Roughly 93 million CT scans in one year now carry a projected shadow of about 103,000 future cancers.
- Imaging volume has rebounded past pre-pandemic levels, and the pace shows no sign of easing.
- Researchers warn that if habits persist, CT-linked cancers could reach 5% of all new diagnoses each year.
- Clinicians and experts are urging patients to ask whether each scan is truly necessary and whether MRI or ultrasound could answer the same question.
In 2023, American hospitals and clinics carried out roughly 93 million CT scans, and a study in JAMA now projects that the radiation from those images could eventually lead to about 103,000 cancers among the people scanned. The figure is not a tally of illness already found but a reckoning of risk, drawn from how much radiation each scan delivers and what earlier generations exposed to radiation have taught us about its long shadow. It arrives as a reminder that a tool which has become almost routine in modern medicine carries a cost that is easy to overlook, even as it remains, for most patients who need it, worth bearing.
In 2023, American hospitals and clinics performed about 93 million CT scans. A study published in JAMA now estimates that the radiation from those scans could lead to roughly 103,000 cancers over the lifetimes of the people scanned.
The estimate is a projection rather than a count. Researchers started with each scan's radiation dose, applied risk models built largely from atomic bomb survivors and other exposed groups, and adjusted for age, sex, and the organs imaged, since younger patients are more vulnerable. Uncertainty ranges and sensitivity analyses accompany the figures. Abdominal and pelvic scans contribute the most, and while children face higher risk per scan, most projected cases fall on adults, who receive most of the scans.
The researchers warn that without change, CT-associated cancer could eventually account for 5% of annual cancer diagnoses. Experts stress that for an individual patient with a real clinical need, the benefits usually outweigh the small risk. The concern lies in the growing volume of scans, some ordered without clear need.
The practical advice is simple: ask whether a scan is necessary, mention recent imaging history, consider radiation-free alternatives like MRI or ultrasound, and ask about the dose. Doses have fallen with newer technology. The study's message is balance, not avoidance: keep using a tool that saves lives, but use it with more care.
In 2023, American hospitals and clinics performed about 93 million CT scans. A study published in JAMA now estimates that the radiation from those scans alone could lead to roughly 103,000 cancers over the lifetimes of the people who were scanned.
The researchers say the pattern is not slowing. CT use in the US dipped during the pandemic and has since climbed back above its earlier level. The test is fast and detailed, and it catches problems other scans can miss. Technology has made it sharper, and the study's framing reflects how far it has moved from a specialized tool to something close to routine.
The 103,000 figure is a projection, not a count of diagnoses. The team started with the 93 million scans and the radiation dose associated with each type of scan. They then applied established risk models, drawn mainly from atomic bomb survivors and other radiation-exposed groups, which estimate lifetime cancer risk per unit of radiation. The calculation was adjusted for age, sex, and the organs exposed, because younger patients are more sensitive to radiation-induced cancer. The researchers multiplied dose by risk by scan volume, summed the results across scan types and patient groups, and included statistical uncertainty ranges and sensitivity analyses to reflect how confident the estimate can be.
The projected cancers are not evenly spread. The most common are lung, colon, leukemia, bladder, and breast cancers. Abdominal and pelvic CT scans contribute the largest share. Children face a higher risk per scan, but adults undergo most of the scans, so most of the projected cancers are in adults.
The researchers' own warning looks ahead. If current practices persist, they wrote, CT-associated cancer could eventually account for 5% of all new cancer diagnoses each year.
Experts quoted alongside the findings are careful to separate the population estimate from the individual decision. For a patient who needs a CT scan, they say, the risk is low and the benefit usually outweighs it, through accurate diagnosis, guidance for treatment, or detection of serious conditions. The concern is the growing volume of imaging, some of it ordered where there is no clear clinical need.
The practical advice that accompanies the study is plain. Patients can ask whether the scan is medically necessary, and they can mention how many CT scans they have had recently, since age and scan history matter. They can ask whether MRI or ultrasound, which involve no radiation, could answer the same question. They can also ask about the dose for their particular scan; doses have fallen significantly with newer technology, and radiologists aim for the lowest dose that gives a clear image.
The study's message is one of balance rather than avoidance: keep using a tool that saves lives, but use it more judiciously. What to watch is whether scan volumes keep rising, and whether clinicians and patients respond by weighing alternatives and doses more often before ordering the next scan.
Citas Notables
If current practices persist, CT-associated cancer could eventually account for 5% of all new cancer diagnoses annually.— JAMA study researchers
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