Which of the following is commonly included as a QA item for dental X-ray units?

• A. Receptor alignment checks
• B. Patient interview
• C. Film developing chemistry
• D. Cleaning frequency

Answer: (A)

Receptor alignment checks are vital in QA for dental X-ray units because the accuracy of the image depends on the receptor being positioned correctly relative to the tooth and the X-ray beam. When the receptor is aligned and centered, geometric distortion is minimized, magnification is consistent, and diagnostic information is preserved, while also reducing the chance of retakes and unnecessary patient exposure. The other listed items don’t assess the imaging performance of the X-ray unit: interviewing the patient is about safety and history-taking, film developing chemistry relates to processing, and cleaning frequency is a sanitation/maintenance task rather than a measure of the machine’s imaging performance.