The rays are directed from the apparatus onto a sensitised plate which is positioned on the far side of the area being examined. These rays are blocked to a varying degree by bone or other tissues based on their density. The contrast between these densities shows as a line on the pictures. A bone fracture would also show clearly due to this variation.
The vet will look out for chips, fractures, bone spurs, roughening (blurring) of the edges of the bone, dark spots and any differences to what is considered 'normal'.
Top is a healthy navicular bone, bottom picture is not.
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