What is the recommended FFD for an AP HIP X-ray?

For an AP hip X-ray, the recommended focal-film distance (FFD), also known as source-to-image distance (SID), is typically 40 inches. This distance is optimal for achieving a good image quality, as it allows for adequate exposure and detail while minimizing distortion and magnification that can occur at shorter distances.

Maintaining this specific distance helps ensure the x-ray beams are perpendicular to the imaging receptor, which is critical for obtaining a clear and accurate representation of the hip joint. It also strikes a balance between sufficient penetration of the x-ray beams through the thicker structures of the hip and the resolution of smaller anatomical details.

Utilizing a 40-inch FFD aligns with standard radiographic practice, enhancing the quality of the diagnostic images for effective evaluation by healthcare professionals.