FLOW-TIME ANALYSIS DURING SONOGRAPHIC FLO W MEASUREMENTS - IN-VITRO STUDIES TO TEST THEIR ACCURACY

Flow-time analysis is a new technique for colour coded sonographic flo w measurements. The measurements depend on a pattern of ultrasound pul ses and have some significant advantages compared with Doppler procedu res. The accuracy of the method and possible sources of error have bee n studied under experimental conditions. Measurements on continuous bl ood flow showed a correlation of r > 0.99 for duplex sonography and of r > 0.93 for flow-time analysis. For this method, the colour coding p arameters must be optimal in order to achieve high accuracy. Under the se conditions quantitative measurement of pulsatile flow also becomes possible during colour mode.