The method includes acquiring the gray tone images, and plotting a histogram of the average pixel signal intensities for {HEAD ~ selected regions} of {TAIL ~ interest} in each image 
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The method includes acquiring the gray tone images , and plotting a histogram of the average pixel signal intensities for { HEAD ~ selected regions } of { TAIL ~ interest } in each image
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH