Which factor requires careful consideration, when taking measurements from an image?

 # Which factor requires careful consideration, when taking measurements from an image? 

A. Definition 

B. Magnification 

C. Reconstruction 

D. Superimposition

The correct answer is B. Magnification.

The magnification factor of any image must be carefully considered when taking measurements. Image definition is significant to the overall diagnosis; however, the magnification factor is of special concern when calculating bone dimensions.  Image reconstruction is largely a function of multiplanar reformatting (MPR).  Superimposition is a factor for some images (panoramic radiographs and conventional tomograms); however, the magnification factor must be carefully considered when calculating bone dimensions.