How can I measure the thickness of a circle line?

Hi,
we try to measure the thickness of a circle line to find out if the circle is round or if there is any deviation in the circle. By now we are using the FindEdges tool and measure the circle at different points.but this is not sufficient.
Does anyone has an idea how we can measure the thickness of the line of a circle?
thanks
Oliver

Hi,
yes I have two pictures.
Picture 1 is the original, Picture 2 is the "working picture"
greetings
Oliver
Attachments:
Picture1.zip ‏243 KB
Picture2.zip ‏5 KB

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