What is the recommended cassette size for a lateral ankle X-ray?

For a lateral ankle X-ray, the recommended cassette size is 10" x 12". This size is appropriate because it provides enough coverage to capture the entire ankle joint, including the distal ends of the tibia and fibula, as well as the adjacent tarsal bones. The lateral projection is particularly critical for properly visualizing the relationships between the bones and for assessing any fractures or dislocations at the ankle.

Choosing a cassette size that is too small may result in inadequate imaging of the area of interest, while a size that is too large can lead to unnecessary exposure of adjacent tissues. The 10" x 12" size strikes a balance, allowing for both adequate exposure and the ability to view the necessary structures clearly. Therefore, this size is the standard for achieving high-quality images in lateral ankle radiography.