Which statement best describes collimation recommendations?

• A. The Area Exposed Should Never Be Larger Than The Film Size Used
• B. The Useful Beam Should Be Limited To The Smallest Area Practicable And Consistent With The Objectives
• C. The X-Ray Beam Area Ratio Should Be Less Than One
• D. All Of The Above

Answer: (D)

Collimation is about keeping the X-ray field as small as possible while still covering the anatomy of interest. This reduces patient dose and scatter, which improves image contrast and helps with accurate positioning.

Exposing an area larger than what the image receptor will record wastes dose, because you’re irradiating tissue that won’t contribute to the image. Therefore, the field should be limited to the size of the receptor or smaller, ensuring the area exposed does not exceed what will be captured.

Using the smallest practicable field that achieves the clinical objective aligns with ALARA principles—you want the least exposure necessary to obtain a diagnostic image.

The beam’s area relative to the film or detector should not exceed the receptor size; the beam should fit within that area, ideally not larger than the film. Taken together, these points describe consistent, dose-conscious collimation practice.

That’s why all of the above statements reflect proper collimation recommendations.