CAMRT Radiography Practice Exam

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What is the magnification factor if the SID is 40", the SOD is 38", and the OID is 2"?

1.09
1.05
1.12
1.03

The correct answer is: 1.05

To determine the magnification factor in radiography, you can use the formula: Magnification Factor = (SID / SOD) In the given problem, the source to image distance (SID) is 40 inches and the source to object distance (SOD) is 38 inches. Plugging in the values: Magnification Factor = 40 inches / 38 inches Calculating this gives: Magnification Factor ≈ 1.0526 When rounding to two decimal places, this value translates to approximately 1.05. This result indicates that the image appears 1.05 times larger than the actual object size. This factor is crucial in understanding how distances in radiography affect the size of the images produced. Accurate measurement of SID and SOD is essential for ensuring proper image magnification, which can influence diagnosis and treatment planning.