For example, {HEAD ~ a CT image} obtained with {TAIL ~ an X ray CT apparatus} and a PET image obtained with PET are examples of medical images obtained by each different modality 
obtained with
For example , { HEAD ~ a CT image } obtained with { TAIL ~ an X ray CT apparatus } and a PET image obtained with PET are examples of medical images obtained by each different modality
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH