Which of the following factors would enhance the visibility of structural sharpness in radiographs?

High image contrast is crucial for enhancing the visibility of structural sharpness in radiographs. It refers to the difference in density between the lighter and darker areas of the image. When there is a greater contrast, the edges of structures appear more distinct, allowing for improved delineation of anatomical features. This is especially important in diagnostic imaging, where the clarity of edges helps radiologists identify abnormalities or pathological changes.

Increased radiation dose does not inherently enhance visibility and can lead to higher noise levels or patient exposure without improving edge recognition. Wider beam divergence reduces sharpness by causing blurring at the edges, making structures less distinct. Higher image noise can obscure fine details, further diminishing the clarity and visibility of structures within the radiographic image. Therefore, high image contrast is the factor that most effectively enhances structural sharpness.