What is the correct central ray entrance point for a medial oblique foot radiograph?

The correct central ray entrance point for a medial oblique foot radiograph is at the base of the third metatarsal. This positioning is important to ensure that the anatomical structures of the foot, particularly the tarsals and the intermediate cuneiform, are displayed appropriately in the radiograph. When the central ray enters at the base of the third metatarsal, it allows for optimal imaging of the various bone structures aligned in a way that minimizes superimposition and provides a clear evaluation of the anatomy.

The base of the third metatarsal is a central reference point in radiographic positioning as it effectively represents the mid-portion of the foot. This ensures that other anatomical features can be accurately viewed without distortion, which is essential for accurate diagnosis and assessment. Thus, the positioning at this point is critical for obtaining a quality image that can inform clinical decisions.