What is the film-focal distance (FFD) for the swimmers view?

The film-focal distance (FFD) for the swimmer's view is typically set at 40 inches. This specific distance is crucial for obtaining optimal imaging of the cervical spine and surrounding structures when the patient is in a swimmer's position.

In this position, the patient's arms are elevated and positioned out of the way, allowing a clear view of the cervical vertebrae. At 40 inches, the X-ray beam's geometry is adjusted to minimize distortion and magnification, providing a clearer and more accurate representation of the anatomy. This ensures that the images produced help in precise diagnostics, as the effectiveness of radiographic views largely depends on maintaining the appropriate film-focal distance.

Using other distances could result in images that are either too magnified or too distorted, potentially complicating the interpretation of the X-ray.