What does a cone cut in radiography usually indicate?

A cone cut in radiography typically indicates that the X-ray beam was not properly aligned with the film or sensor, resulting in an area that remains unexposed. This occurs when the central ray is not directed to the center of the film or sensor, leading to a portion of the image being unaffected by the X-ray exposure due to the divergence of the X-ray beam.

When the central ray misses the center of the film or sensor, the edges are often exposed, but the center will remain clear or underexposed, creating an image that shows a distinct line or area that is devoid of detail. This phenomenon highlights the importance of correctly positioning the film or sensor relative to the X-ray source to ensure a complete and diagnostic image. Proper alignment is critical in achieving optimal radiographic results.