摘要:
The invention relates to an ultrasound imaging method comprising an emission step during which an ultrasonic excitation wave focussed in a target medium (2) is emitted by a network (5) of transducers whereby the excitation wave is passed through a reverberating solid object (7) before it reaches the target medium (2).
摘要:
An imaging method using shear waves for observing a viscoelastic medium (2), comprising: several successive excitation steps j during which elastic shear waves are generated respectively at different excitation loci (L j ) in the viscoelastic medium (2) by an imaging device, the different excitation loci being separated from one another by a maximum distance Dm, - an imaging step corresponding to each excitation step j, in which a set j of successive raw images Im j (t k ) of the viscoelastic medium at times t k are determined during propagation of the shear wave, the raw images having a resolution R which is larger than the maximum distance Dm, an averaging step in which raw images Im j (t k ) corresponding to the same relative time t k are averaged to determine an average image Im' (t k ).
摘要:
Method of probing by wave propagation, in which an incident wave is emitted several times towards one and the same target zone (r0) in a scattering medium (1), and then the backscattered signals generated by these waves are averaged.
摘要:
The invention relates to a method for optimising wave focalisation in an area of interest (6) of a medium (4), the waves being emitted by a source network (3) to the medium (4) via an aberration insertion member (5) for inserting an initially non-determined phase deviation. The method of the invention comprises using M-1 successive modifications of the emitted wave, each resulting in a disturbance. According to the invention, the M disturbances are measured in the area of interest (6) at each modification of the phase and/or amplitude distribution, and these measures are used for deriving optimal focalisation characteristics that maximise the disturbance generated in the area of interest (6).