Image Magnification

It refers to the proportional increase in the dimensions of a radiographed object relative to the actual dimensions of that object and depends on the following factors:

1. Increasing object-to-film distance only will increase the magnification of the radiographic image. Reducing object to film distance only will result in a decrease in magnification of the radiographic image (Figure 8)^2,4,7,8

   

   Comparison of magnification when the object to film distance changes. A short distance (A) shows less magnification than a long distance (B).

2. Increasing source-to-object distance only will decrease the magnification of the radiographic image. Decreasing source to object distance only will increase the magnification of the radiographic image (Figure 9).^2,4,7,8

Figure 9.

Figure 9.

Comparison of magnification when the source to object distance changes. A short distance (A) shows more magnification than a long-distance (B).