radial intensity of donut

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radial intensity of donut

asv5
Hi,

I have a couple of images that have a 'donut' shape on them. I need to divide the donut into four quadrants and subsequently measure the intensity of each arc. I know it will involve using the elliptical selection tool to outline the shape, but beyond this I am not sure how to proceed. Any help is much appreciated.

Thanks,
AV