Which factor can lead to an increase in scatter radiation during fluoroscopy?

An increase in scatter radiation during fluoroscopy is often influenced by increased patient thickness. As the thickness of the patient increases, more tissue and organ mass is present for the primary beam to interact with. This interaction between the primary radiation and the patient's body generates additional secondary radiation, commonly known as scatter radiation. Essentially, thicker patients present a larger volume for the X-ray beam to penetrate, leading to increased scatter as the photons collide with more atoms and get deflected in various directions.

The other factors listed do not contribute to increased scatter radiation in the same way. For instance, the use of narrow beams would typically reduce the volume of tissue exposed, thereby minimizing scatter. Short exposure times usually reduce the amount of radiation exposure overall, which can also decrease scatter. Lastly, the use of digital detectors enhances image quality and may improve the detection of primary radiation while reducing the effects of scatter, rather than increasing it.