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Only last night I experienced weird artifacts in my images and I found the problem to be my flats.
My flats illumination panel is an EL panel and the power supply being a switching supply produces a large amount of interference that cause banding in weird patterns.
It may not be your issue as I were never that concentric but try it out.
The method I used was the severely stretch each colour channel individually where I found the opposite artifacts present.
To fix it I placed a couple of filter ferrous cores and wrapped both the input and output power wires through the core of the ferrite core. My latest flats are clean and so was my image.
Sometimes this issue does not show as the placement of the power supply to the imaging setup can stop this.
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