“…Franklin, Schlegel, and Rushmer (i96i), Rushmer,Baker,and Stegall (I966), and Reid, Sigelman, and Nasser (1969) have also developed Doppler flowmeters. This technique has come to be widely used in the clinical field (Miyazaki, I965;Strandness, McCutcheon, and Rushmer, I966;Strandness et al, I967;Benchimol et al, I968;Yao, Hobbs, and Irvine, 1968; Evans and Cockett, I969;Balas, Segditsas, and Koutsopoulos, 1970;Benchimol, Barreto, and Teng Wei Tio, 1970;Joyner, Harrison, and Gruber, I971;Benchimol and Desser, 1972). goo Nimura, Matsuo, Hayashi, Kitabatake, Mochizuki, Sakakibara, Kato, and Abe Satomura's Doppler technique could reveal the flow velocity; that is, the magnitude of velocity, but not the direction.…”