ADAA X-Ray Practice Exam

Panoramic radiography is especially prone to artifacts from dense objects and shielding because the image is built as the tube and receptor sweep around the patient. One common artifact is ghost shadows from jewelry or headphones. Metal objects near the head but outside the actual imaging field can still interact with the X-ray beam as it moves, creating a secondary, reversed image on the opposite side of the panoramic view. This is a frequent pitfall because patients often wear earrings, necklaces, glasses, or headphones that are not always removed before the exam. Another frequent artifact comes from the lead apron. The shielding can attenuate the beam in its path, producing a noticeable shadow or band on the radiograph, and in some cases can cause distortions due to the rotating geometry. Proper practice is to remove jewelry or metal items and position or omit the lead apron as appropriate to avoid these artifacts, ensuring the area of interest is not obscured. While other issues like motion blur or misalignment can occur in panoramic imaging, they are broader imaging problems not as specific to panoramic artifacts as the two described, and overexposure/underexposure or color shifts aren’t typical concerns for this modality.