DANB Radiation Health and Safety (RHS) Practice Exam 2025 - Free RHS Practice Questions and Study Guide

Cone cutting occurs when the central ray of the x-ray beam is not properly aimed at the center of the film or digital sensor. This misalignment results in only a portion of the film being exposed to the x-ray beam, leading to a distinct loss of image data in the area where the x-ray was not directed.

When the film is mispositioned, particularly if the central ray misses the center, it can create a "cut" through the image, which appears as a white area on the radiograph. Proper alignment is critical in radiographic procedures to ensure that the entire film is adequately exposed, capturing all necessary diagnostic information.

The other answer choices do not accurately describe the cause of cone cutting. The central ray aimed correctly at the center should produce a complete image without missing sections. Similarly, extending the film beyond certain boundaries may affect the visualization of adjacent teeth or structures but does not itself cause cone cutting.