Ultrasound enhancement of transdermal drug delivery Academic Article uri icon


  • This is an echo-ranging system for measuring the velocity of the wall of a heart, or of the flow of blood in an artery. It does not utilize the Doppler effect, but compares the echoes of successive pulses. Ordinarily, that requires the object and the transducer beam to remain always in the same positions, because something called scanning noise makes it impossible to detect velocity when the beam is required to scan an object. This system eliminates that difficulty by providing a time delay and a memory which permit each current echo to be compar. cd with the one from the same direc-tion that was received in the preceding scanning cycle.--LB

publication date

  • January 1, 1989