14-11-2013 дата публикации
Номер: US20130301382A1
Принадлежит:
A method of high-resolution ultrasound imaging, in which transducers are made to emit ultrasound waves in a field of observations containing micro bubbles, by making the micro bubbles burst one by one in tandem with the emissions of ultrasound waves. At each shot j of an ultrasound wave, raw reverberated signals S(i,t) picked up by each transducer i are recorded, and then differential signals V(i,t) representative of variations between successive raw signals are determined, a parabolic function P(x) is fitted to the differential signals corresponding to each shot j, and then a crest A(x,y) of this function P, corresponding to the position of the micro bubble destroyed between shots j-1 and j, is determined. 1. An ultrasound imaging method for imaging a field of observation in an environment to be imaged containing scatterers , said method comprising several successive measurement steps during each of which:an array of transducers emits an incident ultrasound wave into the field of observation, of center wavelength λ,then raw signals Sj(i,t) picked up by each transducer and representative of a reflected ultrasound wave reverberated from the incident wave by the scatterers in the environment are recorded, i being an index denoting each transducer, j being an index denoting each measurement step, and t denoting the time,the array of transducers extending along at least one dimension and the incident waves mainly being propagated in a direction of propagation perpendicular to the array of transducers,wherein a maximum number C of differential targets is generated, differing from one measurement step to another, each differential target being a scatterer which is present in the field of observation during a measurement step and absent during an immediately adjacent measurement step,the number C being at most equal to INT(A/(5λ)2)+1, where A is an area of the field of observation,and wherein said method further comprises the following steps:a differential processing step ...
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