Herein, “different kinds of medical images” indicate {HEAD ~ medical images} that have been obtained by different modality or {TAIL ~ medical images} that have been obtained by different imaging method 
obtained by
Herein , “ different kinds of medical images ” indicate { HEAD ~ medical images } that have been obtained by different modality or { TAIL ~ medical images } that have been obtained by different imaging method
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH