Which item is considered an X-ray accessory?

• A. Collimator
• B. Filtration
• C. Cassettes
• D. X-ray tube

Answer: (C)

An X-ray accessory is something used with the imaging system that isn’t part of generating the X-ray beam itself. The cassette fits this role because it is a detachable holder for film-and-screen (or a receptor in digital systems) that captures the image after the X-rays pass through the patient. The collimator shapes and limits the beam, and filtration removes low-energy photons to improve image quality and patient dose; these are integrated parts of the X-ray unit’s function. The X-ray tube is the source of X-rays, not an accessory. So the cassette is the item that best fits the idea of an X-ray accessory.