What best describes scatter radiation in radiography?

• A. Leakage from the tube housing
• B. Scatter arises from interactions within the patient or objects
• C. Radiation from the image receptor
• D. Scatter from room walls

Answer: (B)

Scatter radiation occurs when the primary x-ray beam encounters matter, most notably the patient's tissues, and photons are deflected from their original path. These deflected photons travel in various directions, and some reach the image receptor, adding unwanted exposure that degrades image contrast. This is why scatter is described as arising from interactions within the patient or objects in the beam path. It’s different from leakage radiation that escapes the tube housing and from any radiation emitted by the receptor or walls. Reducing scatter is a key reason for using collimation and grids, which help preserve image quality by limiting the amount of scattered photons reaching the receptor.