When taking an X-ray, it is important to understand that the distance between an object and the image receptor can cause an image to become magnified. This magnification can be evaluated mathematically with the equation of M=SID/SOD. SOD stands for SID-OID mathematically. So imagine that there is an object that is hovering 10 inches above an IR and the distance from the IR to the CR is 40 inches.
The Math to Show Magnification
M= 40/ (40-10)
M=40/30
M=1.33
Meaning that the image will appear 1.33 times the size it would have been if it was placed flat on the IR. This can cause complications because it can force an image to look differently than it would naturally on an IR.
X-ray X-pert 