Blurred images on dental radiographs most commonly result from movement by which of the following?

• A. Patient
• B. Operator
• C. Receptor
• D. Articulator

Answer: (A)

Motion during exposure is what leads to a blurred radiographic image. Dental radiographs are formed by capturing photons over a brief interval, so any movement of the anatomy relative to the receptor during that time causes the edges of teeth and surrounding structures to smear and lose sharpness. The patient is the most common source of this motion—fidgeting, swallowing, or talking during the exposure often produces the blur you see. While movement of the receptor or the operator can also cause image quality issues, they’re less typically responsible for blur in everyday practice because stabilization devices and technique minimize those movements. The articulator isn’t involved in acquiring intraoral radiographs, so it wouldn’t be a usual cause of blur. To reduce blur, stabilize the patient, use quick exposures, and provide clear instructions and bite blocks to help the patient stay still.