BIOFLUID MECHANICAL STUDIES IN MODELS OF BLOOD VESSELS 
AND SOME APPLICATIONS

D. Liepsch

UDC 612.13

Lasers are used in a wide variety of medical applications. 
While laser catheters have beem developed for highly accurate 
velocity measurement, these are invasive; noninvasive 
techniques are more desirable but not as precise. The laser is, 
however, a great tool for in vitro measurements. Several groups 
internationally are using the laser in the study of local 
velocity distribution in microscopic areas of specially 
constructed models. Laser Doppler anemometry is widely used to 
measure the local, time-dependent velocities, while phase Doppler 
anemometry has been developed to measure particle size, 
distribution and velocity. Most recently, laser analyzer 
techniques have been developed for analyzing the particle size 
of two phase flow systems. It has become increasingly important 
for physicians to visualize blood flow. In addition to the 
techniques mentioned above, several laser sheet techniques have 
been developed for precise measurements. This paper presents a 
short review of laser techniques and shows some applications 
especially for the laser-Doppler anemometer.