[Study of turbulence in the normal and stenotic vessel]. / Untersuchungen zur Turbulenz im normalen und stenotischen Gefäss.

ABSTRACT

Velocity measurements were performed at the test bench, in dogs and in patients with pulsed ultrasound. A new zero crossing counter was used to measure the different frequencies of the doppler spectrum in real time. The ratio of the standard deviation of the radial mean velocity to the radial mean velocity expressed as a percentage proved to be a useful turbulence index to describe stability of flow.