Radiation Safety
Any x-ray or CT scan involves a small amount of ionising radiation. At Birmingham CBCT & OPG Hub, we take radiation safety extremely seriously and follow national guidance to keep doses as low as reasonably achievable (ALARA).
Justification and optimisation
Every scan is justified by a referring clinician, meaning there must be a clear clinical benefit that outweighs the small radiation risk. Once justified, we optimise the scan by:
- Using the smallest field of view that answers the clinical question.
- Selecting appropriate exposure settings for the patient.
- Avoiding repeat scans wherever possible.
How does the dose compare?
In general terms:
- An OPG scan uses a relatively low dose, comparable to a few days of natural background radiation.
- A small field CBCT uses more radiation than an OPG but significantly less than many medical CT scans.
Your dentist has considered these factors before requesting your scan. If you have questions or worries about radiation, please contact us and we will be happy to talk things through.
Pregnancy
If you are, or might be, pregnant, please tell us before your scan. In most dental situations, alternative approaches can be considered or the timing can be adjusted where appropriate.
Frequently Asked Questions
How big is the risk from CBCT or OPG radiation?
The risk from a single dental CBCT or OPG scan is very small, and your clinician will only request imaging when the benefits outweigh that risk. We always keep doses as low as reasonably achievable.
How often can I safely have dental scans?
There is no fixed limit, but each scan must be clinically justified. Your dentist will only request additional imaging when it is necessary for your care.
Will the scan make me radioactive?
No. Dental x-ray and CT scans do not make you radioactive. Once the scan is completed, there is no radiation left in your body.
Can I refuse a scan if I am worried?
Yes. You always have the right to ask questions and to decline a scan. Your dentist can discuss alternative options, although in some cases imaging is important to plan safe treatment.