In order to determine whether a virtual slide image has any out of focus areas and is therefore a candidate for manual inspection, the various focus points used to scan the virtual slide image are used to calculate {HEAD ~ a best fit surface} for {TAIL ~ the virtual slide image} 
for
In order to determine whether a virtual slide image has any out of focus areas and is therefore a candidate for manual inspection , the various focus points used to scan the virtual slide image are used to calculate { HEAD ~ a best fit surface } for { TAIL ~ the virtual slide image }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL