NEBDN OSCE Practice Exam

Coning (beam restriction) problems typically produce which exposure issue?

Collimator not straight Scratched Brown stains Fogged film

Correct Answer:

Collimator not straight

Explanation:

When the beam restriction device isn’t aligned, the X-ray field won’t match the film exactly. If the collimator or cone is not straight, the light field used to position the patient won’t cover the entire film area, so part of the film is not exposed properly. This produces a cone cut—a sharp, straight edge on the film where exposure suddenly stops on one side, while the rest of the image looks normal. Other issues listed (scratches, brown stains, or film fog) come from handling or processing problems, not from beam alignment. To prevent this, ensure the collimator is perpendicular to the film and centered so the light field and X-ray field coincide.

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