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