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Marc, I pretty much do what Russell is doing. I process the image in Registax and create two .tif files. One I rename Rim and the other Surface. I sharpen using wavelets for surface detail, which causes the artifact on the edge and I process the second one with just enough sharpening until I notice the artifact appearing, then I pull back the sliders slightly to make it disappear.
Now I open both in Photoshop and drag the one I've called Rim onto the one I named Surface. Lower the transparency on the top layer to reveal the background image. This will help you register it as best as you can. Once you think you've got them in register, slide the transparency back to normal and toggle between top and bottom layer by clicking on the ' eye ' icon of the top layer. This will turn the top layer on and off. By doing this you will notice any error in registration and you can make micro adjustments with the move tool to align it correctly.
The next part is really up to you. You can make a ' donut ' out of the top layer by using the erasing tool with a soft brush to remove everything except near to the rim, or just blend the top layer with the background layer by trying the many filters available for layers from the drop down list. Once you're happy with the result, flatten the image.
Of course, I'm assuming you have Photoshop!
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