6Mull M. Transcranial Doppler Ultmsonography Versus Arteriography for assessment ct Vertebro -basilar circulation[J] . J Ultresound in medicine,1990,18(T): 539.
7Hashimoto, B E. New Mcthot of adult Transcranial Drpler[J] . J Ultiasound in medicine, 1991,10(T): 349.
8Schneider P A. Noninvasive Evaluatiln of Vertebrobasilar Insufficiencg[J].J Ultrasound in medicine,1991,10(T): 313.
9Werchan PM,Schadt JC,Fanton JW,et al.Cerebral and spinal cord blood flow dynamics during high sustained +Gz.Aviat Space Environ Med 1994;65 (6):501-9
10Jorgensen LG , Perko G , Secher NH . Regional cerebral artery mean flow velocity and blood flow during dynamic ex- ercise in humans . J Appl Physiol , 1992,73 (5) : 1825 - 1830.
