Light imaging elements in {TAIL ~ the bottom} of the fluid channel may be used to image {HEAD ~ the object} 
Light imaging elements in { TAIL ~ the bottom } of the fluid channel may be used to image { HEAD ~ the object }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD