What is the magnification factor if the SID is 40 inches and the OID is 8 inches?

To determine the magnification factor in radiographic imaging, the formula used is:

Magnification factor = (SID) / (SID - OID)

Where SID is the Source-to-Image Distance, and OID is the Object-to-Image Distance. In this case, we have an SID of 40 inches and an OID of 8 inches.

First, plug in the values:

1. Calculate the denominator: SID - OID = 40 inches - 8 inches = 32 inches.

2. Now, substitute these values into the formula:

Magnification factor = 40 inches / 32 inches.

Upon performing that division, we find:

40 / 32 = 1.25.

This value indicates that the image appears larger than the actual object by a factor of 1.25. The correct answer reflects the calculated magnification factor based on the defined distances in the scenario. Understanding this concept is important in radiography, as it directly impacts image quality and measurement accuracy.