Investigations of Artifact «Pseudo-flow» Physical Mechanisms in Ultrasound Dopplerography

Physical mechanisms of appearance of “pseudo-flow” artefact consisting in image liquid colouring during ultrasound dopplerography are investigated. This artifact caused by real liquid movement under ultrasound influence due to streaming effect. Experiments are made on the modeling environment (liquid with gas bubbles). The fundamental laws of artefact “pseudo-stream” occurrence under the influence of radiating pressure forces are shown. The investigated physical mechanisms allow to predict artefact parametres for any composition of liquid and gas environments with any bubble sizes at various intensity levels of and working frequencies of ultrasound sensors. Studying of physics of artefact appearance gives the possibility of its elimination and reception of more true echogram and hence reduces a diagnostic error. The knowledge of occurrence laws of artefact “pseudo-stream” which is a diagnostic disease sign allows to raise the information parameters about a blood-groove and other moving structures.