TY - RPRT TI - Ultrasonic tissue characterization with a real time integrated backscatter imaging system in normal and aging human hearts. AU - T Masuyama AU - U Nellessen AU - I Schnittger AU - T L Tye AU - W L Haskell AU - R L Popp PY - 1989 DO - 10.1016/0735-1097(89)90019-3 UR - https://pubmed.ncbi.nlm.nih.gov/2685077/ ID - 2685077 ER -