X-Ray Radiation Exposure: What You Need to Know

X-ray radiation issues?

The radiation dose for a single cervical X-ray is approximately 0.2 millisieverts (mSv).
However, the total radiation exposure can vary based on the specific type of imaging performed and the number of views taken.

In your case, if you have undergone cervical X-rays four times, the cumulative dose would be around 0.8 mSv, assuming each X-ray is about 0.2 mSv.
The figure of 1.454 mSv you mentioned for spinal examinations may include additional imaging techniques or views that contribute to a higher dose.
It's important to consider the benefits of imaging versus the risks associated with radiation exposure.
If your healthcare provider recommends further imaging based on your medical needs, it is generally safe to proceed, as the benefits often outweigh the risks.
However, if you have concerns about radiation exposure, it is advisable to discuss them with your healthcare provider, who can provide personalized recommendations based on your health history and needs.

Miss Ke, 20~29 year old female. Ask Date: 2022/07/19

Dr. Wang Yifen reply Radiology

Hello, there are many factors that can affect the dose of radiation exposure, including the area of exposure, the range of exposure, the distance from the source, and the duration of exposure.
The body size of the individual being examined can also influence the radiation dose.
According to information from the American Society of Radiologic Technologists, the radiation dose for a single X-ray of the adult upper back is approximately 1 millisievert, while the dose for the lower back is about 1.5 millisieverts, and the dose for a neck X-ray is around 0.2 millisieverts.
Since the spine is located in the back of the body, the radiation dose from a spinal X-ray will be higher than that of a neck X-ray, which only examines soft tissues.
The necessity of the X-ray examination is considered, and there are no restrictions on the radiation dose or the number of examinations.
The American Association of Physicists in Medicine published a public statement in 2011 indicating that if a single "radiation examination" has a dose of less than 50 millisieverts, and multiple "radiation examinations" are performed within a short period (such as one year) with a total dose of less than 100 millisieverts, the potential risks associated with the "radiation dose" can be considered negligible, or even non-existent.
Following a doctor's instructions to undergo radiation-related examinations is based on the consideration that the health benefits outweigh the effects of radiation.
If there are any concerns, it is advisable to communicate further with the physician before undergoing the examination.
One should not avoid examinations out of fear of radiation, as this may lead to missed opportunities for disease treatment.
Please refer to the above information, and I wish you peace and health.
Ministry of Health and Welfare Health Passbook Press Release https://www.mohw.gov.tw/cp-5023-64571-1.html American Radiologic Technologists website https://www.xrayrisk.com/calculator/calculator.php

Reply Date: 2022/07/19

More Info

When it comes to understanding X-ray radiation exposure, it is essential to grasp both the principles of radiation safety and the specific doses associated with various types of X-ray examinations.
To address your question regarding the radiation dose of a cervical X-ray, the typical dose for a single cervical spine X-ray is approximately 0.1 to 0.2 millisieverts (mSv). This value can vary based on the specific technique used, the equipment, and the patient's body size. The figure you mentioned, 1.454 mSv for a spinal examination, likely represents a cumulative dose from multiple views or angles taken during the examination of the cervical and thoracic spine. It is important to note that when multiple images are taken, the total dose can add up significantly.

In your case, if you have undergone four cervical X-ray examinations, and if each was around 0.2 mSv, the total would indeed be close to 0.8 mSv. However, if your health records indicate a total exposure of 3.5 mSv, it is possible that this includes additional imaging or other factors that contributed to the higher dose. It's crucial to clarify this with your healthcare provider or the radiology department to understand the specifics of your exposure.

Regarding your concern about cumulative radiation exposure, it is important to recognize that while there is a theoretical risk associated with radiation exposure, the actual risk from low-dose X-rays is quite small. The International Commission on Radiological Protection (ICRP) suggests that the risk of developing cancer from low-dose radiation is proportional to the dose received, but the risk from a single diagnostic X-ray is minimal compared to other everyday risks.

In general, the annual dose limit for the general public is set at 1 mSv from artificial sources, excluding natural background radiation. Most people receive about 3 mSv per year from natural background radiation alone. Therefore, if your cumulative exposure remains below these thresholds, it is typically considered safe.

If you are concerned about further X-ray examinations this year, it is advisable to discuss this with your physician. They can evaluate your medical history, the necessity of further imaging, and the potential benefits versus risks. In many cases, the benefits of obtaining necessary diagnostic information through X-rays outweigh the risks associated with low-level radiation exposure.

In summary, while it is essential to be mindful of radiation exposure, especially with multiple X-ray examinations, the doses associated with standard diagnostic X-rays are relatively low and generally considered safe. Always consult with your healthcare provider for personalized advice based on your specific medical needs and history.

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