Where is the correct central ray location for an anteroposterior (AP) projection of the fifth digit?

For an anteroposterior (AP) projection of the fifth digit, the central ray should be directed to the fifth metatarsophalangeal (MTP) joint. This positioning is crucial because the purpose of the AP projection is to obtain a clear image of the fifth digit, allowing for optimal visualization of the bones, joints, and surrounding soft tissue of that area. By centering the image on the fifth MTP joint, it ensures that the alignment and anatomy of the fifth digit are accurately captured, which is critical for diagnostic purposes.

In imaging, the metatarsophalangeal joints serve as the focal points for positioning related to the toes. Since the fifth digit is specifically the little toe, targeting the fifth MTP joint provides the most detailed and focused representation of the digit being examined. This technique minimizes distortion and maximizes clarity, serving the needs of proper diagnosis and treatment planning by health professionals.