{HEAD ~ The present invention} involves {TAIL ~ a grid} which allows the desired x rays to pass through efficiently while blocking the undesirable scattered x rays, and a process for fabricating the grid 
involves
{ HEAD ~ The present invention } involves { TAIL ~ a grid } which allows the desired x rays to pass through efficiently while blocking the undesirable scattered x rays , and a process for fabricating the grid
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL 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