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Discussion: Magnification in opgReported This is a featured thread

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Posted Anonymously
Magnification in opg
Dec 27 2008, 8:28 AM EST | Post edited: Dec 27 2008, 8:28 AM EST
Pls could you let me know what is the magnifcation factor in conventional and digital OPG?
Can it be reduced to zero?
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AndyC
AndyC
1. RE: Magnification in opg
Jan 6 2009, 9:41 PM EST | Post edited: Jan 6 2009, 9:41 PM EST
Magnification is caused by the object film distance. OPG machines need to be able to move around the head and therefore need a larger object film distance than usual. This distance will be different for each machine manufacturer and different for each person (the width of peoples jaw varies).

A way to test the amount of magnification would be to tape an object of known size to the chin rest, take an image and measure it on the film to see the size difference 3  out of 3 found this valuable. Do you?