Radiation Exposure from Multiple X-rays and CT Scans: Risks and Insights

Q: Radiation Exposure from Multiple X-rays and CT Scans: Risks and Insights

Hello Mr. <br>Huang： The spine can be divided into the cervical, thoracic, lumbar, and sacral regions. <br>According to the website supported by the American Registry of Radiologic Technologists, the radiation dose from a head CT scan is approximately 2 millisieverts, two chest X

Radiation issues

Hello Dr.
Wang: This year, I went to a clinic for X-rays due to lower back pain, and they told me I have scoliosis.
I then went to Asia University Hospital and had two more X-rays to check for scoliosis, totaling three spinal X-rays (two images taken at different angles each time).
I found on Google that a single lumbar spine X-ray is approximately 1.5 millisieverts.
I'm not sure if lumbar spine X-rays and spinal X-rays refer to the same thing; if they do, that would mean I've received about 9 millisieverts from those X-rays.
In October, I also had a CT scan of my head (with contrast), two chest X-rays, and three full-mouth dental X-rays.
Could you please advise me on the total radiation exposure I've had this year? Is there a cancer risk associated with this level of exposure? Thank you, Dr.
Wang.

Mr. Huang, 10~19 year old female. Ask Date: 2018/11/05

Dr. Wang Yifen reply Radiology

Hello Mr.
Huang: The spine can be divided into the cervical, thoracic, lumbar, and sacral regions.
According to the website supported by the American Registry of Radiologic Technologists, the radiation dose from a head CT scan is approximately 2 millisieverts, two chest X-rays are about 0.2 millisieverts, and three full-mouth dental X-rays are around 0.03 millisieverts.
More than 99% of these radiological examinations do not pose an additional risk of cancer.
However, since the effects of radiation doses are cumulative, it is advisable to avoid unnecessary radiation exposure.
Before undergoing X-ray examinations, please discuss the necessity of the tests thoroughly with your physician.
Wishing you safety and good health.

Reply Date: 2018/11/05

More Info

Dear Patient,
Thank you for your inquiry regarding radiation exposure from multiple X-rays and CT scans. It's understandable to be concerned about the cumulative effects of radiation, especially given the frequency of your imaging studies this year. Let's break down the information regarding radiation exposure and its potential risks.

First, let's clarify the terminology. The terms "腰脊X光" (lumbar spine X-ray) and "脊椎X光" (spinal X-ray) can often refer to similar imaging studies, particularly when assessing conditions like scoliosis. Each lumbar spine X-ray typically exposes a patient to about 1.5 millisieverts (mSv) of radiation, and if you had three sessions with two images taken each time, that would indeed amount to approximately 9 mSv from those X-rays alone.

Next, regarding your CT scan of the head with contrast, the radiation dose is significantly higher than that of standard X-rays. A head CT scan generally delivers about 2 mSv of radiation. If you also had two chest X-rays, that would add approximately 0.1 mSv (0.05 mSv per chest X-ray). Lastly, dental X-rays can vary, but a full mouth series typically delivers around 0.4 mSv. If you had three full mouth X-rays, that would add about 1.2 mSv.

Now, let's summarize your total radiation exposure for the year:
1. Lumbar Spine X-rays: 3 sessions x 2 images x 1.5 mSv = 9 mSv
2. Head CT Scan: 2 mSv
3. Chest X-rays: 2 x 0.05 mSv = 0.1 mSv
4. Dental X-rays: 3 x 0.4 mSv = 1.2 mSv
Total Estimated Radiation Exposure: 9 mSv + 2 mSv + 0.1 mSv + 1.2 mSv = 12.3 mSv
In terms of cancer risk, the International Commission on Radiological Protection (ICRP) suggests that doses below 100 mSv are not associated with significant clinical effects. Your total exposure of approximately 12.3 mSv is well below this threshold. However, it is essential to remember that radiation exposure does accumulate over time, and repeated exposure can increase the risk of radiation-induced effects, including cancer.

The risk of developing cancer from radiation exposure is generally considered to be low, especially at doses below 20 mSv. The risk increases with higher cumulative doses and is also influenced by factors such as age, sex, and individual susceptibility. For instance, younger individuals are more sensitive to radiation than older adults.

It is crucial to maintain open communication with your healthcare provider regarding the necessity of each imaging study. If you have concerns about the frequency of your imaging, you might discuss alternative imaging modalities, such as MRI, which does not involve ionizing radiation. However, MRI may not always be suitable for every clinical situation, and its availability can vary.

In conclusion, while your cumulative radiation exposure this year is notable, it remains within a range that is generally considered safe. Nonetheless, it is always prudent to discuss any concerns with your physician, who can help weigh the benefits of necessary imaging against the potential risks. Regular monitoring and judicious use of imaging studies are key to ensuring your health and safety.

Wishing you good health,
Doctor Q&A Teams

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