We encounter radiation naturally every day. Cosmic radiation filters down through the atmosphere, terrestrial radiation comes from the earth (rocks and building materials), and trace amounts are present in the food we eat, the water we drink, and the air we breathe.
On average, people in the United States are exposed to approximately 3.1 millisieverts (mSv) of natural background radiation per year, although this varies by location.
Radiation also plays an important role in medicine. X-rays allow clinicians to see internal structures, small amounts of radioactive material may be used in certain imaging tests to evaluate body functions, and higher doses of radiation are used therapeutically to treat conditions such as cancer.
While very large radiation doses can cause tissue injury or increase long-term cancer risk, the radiation levels used in diagnostic imaging are low. When medical imaging is recommended, the benefit of obtaining accurate diagnostic information greatly outweighs the minimal associated risk.
Our Commitment to Radiation Safety (ALARA)
Our goal is to keep radiation exposure As Low As Reasonably Achievable (ALARA) while still producing high-quality diagnostic images. This is accomplished through:
- Time
Radiation dose is directly related to how long exposure occurs. We use the shortest exposure time necessary to obtain diagnostic images. - Distance
Increasing distance from the x-ray source significantly reduces radiation intensity. Proper equipment design and positioning maximize this protection. - Shielding
Appropriate shielding is used when indicated. Lead aprons and thyroid collars may be utilized based on the clinical situation.
How Much Radiation Does a CBCT Scan Involve?
Most dental and maxillofacial CBCT scans deliver an effective dose that is comparable to:
- A few hours of commercial airline flight at cruising altitude
or - Several days of normal background radiation
Your doctor has determined that the diagnostic value of your CBCT scan is far greater than the minimal radiation risk and is essential for accurate diagnosis and appropriate treatment planning.
If you have questions about your scan or radiation exposure, our team is happy to discuss them with you.