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