Which of the following is NOT a type of beam restrictor?

Which of the following is NOT a type of beam restrictor?

• A. Collimators
• B. Cones
• C. Aperture Diaphragms
• D. Image Receptors

Answer: (D)

The correct answer identifies "Image Receptors" as not being a type of beam restrictor because image receptors are devices used to capture the radiation after it passes through the patient and produce an image. They are integral to the imaging process but do not serve the purpose of limiting or shaping the x-ray beam before it interacts with the patient.

In contrast, collimators, cones, and aperture diaphragms are all devices specifically designed to restrict the x-ray beam. Collimators adjust the size and shape of the beam using adjustable lead shutters, while cones and aperture diaphragms control the beam's shape and field size by physically limiting the area from which the x-rays can exit the tube. Understanding the distinction between these components helps clarify their respective roles in the radiographic process.