What occurs when the central ray does not cover the film adequately?

When the central ray does not adequately cover the film, it results in a cone cut. This phenomenon occurs when the x-ray beam is not perfectly aligned with the center of the imaging receptor, meaning that parts of the film may not be exposed to the x-rays. The result is a section of the image that is unexposed or poorly exposed, causing a clear area or "cut" in that portion of the image.

The term "cone cut" specifically refers to this situation because it is often associated with the use of collimation devices, where a cone structure directs the x-ray beam. If the cone is not positioned correctly relative to the film, the areas outside the path of the central ray will remain unexposed, thus creating the characteristic appearance of a cone cut on the radiograph.

Understanding the concept of cone cut is crucial for ensuring optimal image quality in radiologic practices. Proper alignment and calibration of equipment, alongside careful positioning of the patient and the imaging receptor, can help prevent this issue and ensure that the entire area of interest is captured.