Which part of the foot does the tangential projection mainly focus on during imaging?

The tangential projection is predominantly utilized to provide a clear view of the sesamoid bones, which are small bones located beneath the first metatarsophalangeal joint. This imaging technique is designed to profile these bones, allowing for better visualization of the structures and any potential abnormalities, such as fractures or arthritis. The tangential projection minimizes overlapping structures, making it ideal for assessing the sesamoids, which can be difficult to see on standard X-rays due to their location and the surrounding anatomy.

In contrast, the heel, arch, and ankle joints may not be the primary focus of this specific imaging technique. Each of those areas has distinct anatomical features and may be better examined through alternative projections that provide a more comprehensive view of the bones and soft tissues in those regions. By emphasizing the sesamoid bones, the tangential projection becomes crucial in diagnosing specific conditions related to these small yet significant structures in the foot.