Ghost image (diagram)

Case contributed by Andrew Murphy

Simplified diagram depicting how ghost images occur on an OPG. 

Also note: Mesially impacted lower third molars (wisdom teeth)

Case courtesy of Dr Matthew Lukies, rID: 46588

Case Discussion

This is a simplified diagram replicating a common artefact seen on OPG. As the x-ray source and detector rotate around the patient dense objects (such as an earring) at the edge of the case, outside the focal trough - can cause 'ghost images'. These are seen at the contralateral aspect of the image and are distorted. If the reader is not careful, ghost images may replicate pathology - any dense material seen on an OPG should prompt the reader to carefully inspect the other side of the image for the original structure or ghost image.

How to use cases

You can use Radiopaedia cases in a variety of ways to help you learn and teach.

Creating your own cases is easy.

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.