The delivered energy is subtracted from the actual energy detected by the sensor to determine {HEAD ~ a delta} which corresponds to the energy absorbed by {TAIL ~ the tissue} 
The delivered energy is subtracted from the actual energy detected by the sensor to determine { HEAD ~ a delta } which corresponds to the energy absorbed by { TAIL ~ the tissue }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL