Which formula is used to determine the magnification factor?

The magnification factor is determined by understanding the relational distances between the source, object, and image receptor in radiographic imaging. The correct choice demonstrates that the magnification factor is calculated using the source-to-image distance (SID) divided by the source-to-object distance (SOD).

This relationship provides insight into how much larger the image appears compared to the actual object size. As the SID increases relative to the SOD, the magnification of the object in the image also increases. This principle is fundamental in medical imaging, where precise measurements are critical for accurate diagnoses and treatment planning.

In context, the other options do not accurately represent the correct formula for magnification because they involve incorrect relationships or distances that do not convey the intended interaction between the source, image, and object. Understanding these distinctions is crucial for effective image evaluation and quality control in the field.