METHOD OF COMPENSATION OF DISTORTION OF IMAGES OF THE BRAIN AND BLOOD CIRCULATION IN ITS VESSELS FOR TRANSCRANAL ULTRASOUND RESEARCHES

摘要

FIELD: medicine; physics.;SUBSTANCE: invention relates to ultrasonic medical diagnostics and can be used for ultrasound examination and evaluation of the state of the brain and its vessels. Method for compensating of distortions in brain images and blood flow in its vessels during transcranial ultrasound examinations involves the formation and transformation of electrical pulses into probing ultrasound signals, scanning of brain structures by them with transceiver multi-element sensor installed in one of the windows of acoustic transparency on the patient's head, receiving, converting reflected echoes and forming images based on them, while on the opposite side of the patient's head, coaxially with the multielement sensor, the adjusting sensor is placed in the window of acoustic transparency located on the opposite side of the skull by means of the holder and preliminary carry out adjusting the reception including the formation of probing pulses, their radiation in the form of an ultrasonic signal by the calibrating sensor, measurement of delays or phase shifts of the received signals in separate elements of the multielement sensor and storing the measured signals, and / or adjusting the transmission including the formation of probing pulses, alternating emission by separate elements of the multielement sensor, receiving probing pulses from each element of the multi-element sensor with a calibration sensor, measuring and memorizing the mutual differences in delay or phase shift of the signals received by the adjustment sensor. In this case, during the alignment, the phase distortions or signal delays introduced by the cranial bone, measured when aligned to receive a phase or delay in each element of the multielement sensor, or measured during the phase or delay alignment of the signals received by the calibrating sensor during the sequential emission of the probe pulses by each element of the multielement sensor, is compared with the measured value for one of the elements selected as a reference, after which the measured phase or delay of the signals relative to the reference element is compared with these values, which were obtained in the absence of bone tissue, calculate differences based on the construction of the amplitude and phase profile of the skull bone tissue in the aperture area of the scanning sensor and introduce them into the ultrasonic beam shaper when transmitting and receiving signals.;EFFECT: use of the invention makes it possible to increase the resolution and quality of the resulting image in order to provide an increased level of reliability and objectivity in evaluating the state of the brain.;9 cl, 4 dwg