Which factor influences magnification mammography the most?

The most significant factor influencing magnification mammography is focal spot size. In magnification mammography, the goal is to obtain increased detail of small structures, such as calcifications, which can be critical for accurate diagnosis.

The focal spot is the area on the anode where the X-ray beam is generated. A smaller focal spot size allows for greater detail in the image. This is because a smaller source of radiation results in a less pronounced penumbra, or blurring at the edges of structures, which enhances spatial resolution.

When a smaller focal spot is used in conjunction with a technique that minimizes motion and optimizes the geometry of the imaging system, the clarity of the magnified images can be significantly improved. Therefore, the choice of focal spot size directly impacts the quality and diagnostic utility of magnified mammographic images, making it a critical factor in this specific imaging technique.