For an AP foot X-ray, what is the recommended cassette size?

The recommended cassette size for an AP foot X-ray is 10" x 12". This size is optimal because it provides sufficient coverage to capture the entire foot and include important anatomical landmarks such as the toes, metatarsals, and portions of the tarsals. A larger cassette allows for a more versatile imaging area, ensuring that the required structures are well-visualized and properly aligned within the film limits.

Other cassette sizes, while they may capture parts of the foot, could lead to insufficient detail for diagnostic purposes or may require repeat imaging to include all necessary structures. The 10" x 12" size strikes a balance between compactness and coverage, making it the standard choice for foot imaging in radiography.