Compared with older guidelines, the common resolution value often cited for screen-film mammography practice is

• A. 7 lp/mm
• B. 10 lp/mm
• C. 15 lp/mm
• D. 25 lp/mm

Answer: (C)

In screen-film mammography, resolution is described by how many line pairs per millimeter the system can reliably reproduce. Higher resolution means finer detail can be seen, which is crucial for identifying tiny features like microcalcifications and small masses.

Modern practice targets a relatively high spatial resolution because advances in screen-film materials, film speed, processing, and imaging geometry have improved the system’s ability to resolve fine detail. This higher target is chosen to support accurate detection of subtle findings while balancing patient dose and image quality. Achieving it depends on keeping motion controlled, using appropriate exposure to preserve contrast at high spatial frequencies, and maintaining high-quality screen-film pairs.

So, the commonly cited value reflects what well-optimized, contemporary screen-film systems can consistently deliver, rather than the lower capability associated with older guidelines.