What is the recommended source-to-image distance (SID) for a cross-table lateral cervical spine radiograph with a horizontal beam?

For a cross-table lateral cervical spine radiograph with a horizontal beam, the recommended source-to-image distance (SID) is typically 72 inches. This distance is significant because it helps to minimize magnification and distortion of the cervical spine structures, providing a clearer and more accurate image.

Using a longer SID, such as 72 inches, enhances the sharpness of the image and reduces the amount of scatter radiation that can affect image quality. It also helps in delineating the anatomical details of the cervical vertebrae, which is crucial for proper diagnosis and assessment of any potential injuries or conditions.

In contrast, shorter distances, such as 60 inches or 48 inches, can lead to increased magnification and reduced image quality, making it harder for the radiologist to interpret the results accurately. Therefore, the choice of 72 inches aligns with best practices for achieving optimal imaging results in cervical spine radiography.