acquiring the image taking {HEAD ~ conditions} at {TAIL ~ the time} at which the image information on the subject are taken, 
at
acquiring the image taking { HEAD ~ conditions } at { TAIL ~ the time } at which the image information on the subject are taken ,
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH