METHOD FOR DETERMINING MICROEMBOLI IN CEREBRAL BLOOD FLOW

摘要

A method for determining microemboli in cerebral blood flow using a Doppler ultrasound system comprises detection in said time zone Doppler signals of high intensity transistor signals, power of which exceeds averaged signal power of the background blood flow by at least the value of the predetermined threshold detection, wherein the detection of each next transistor signal – HITS, HITS,HITS, …HITSis carried out based on the averaged signal power of the background blood flow corrected subject to the power value of the detected previous transistor signal - HITS, HITS,HITS, …HITS. Further, the microemboli signals are determined among the detected transistor signals, for which detect “the core” of said signal at the amplitude-frequency characteristic of the high intensity transistor signal by defining a zone of the amplitude maximum arranged between two zones of amplitude local minimums. There detected the threshold value of “the core” power of the microemboli signal in the zone of the amplitude maximum, estimate the ratio between the power of each detected transistor signal in the zone of amplitude maximum to the power of said transistor signal for the whole its zone and find the microemboli signal in exceeding the value of said ratio of the predetermined threshold value of the “the core” power of the microemboli signal.