Esaote S.p.a.

Actis Active Sensors S.r.l.

Other

Esaqte S.p.a.

Elena Biagi

Leonardo Masotti

Luca Breschi

Simona Granchi

Marino Cerofolini

Fabrizio Margheri

David Menichelli

Alberto Bertini

Marco Scabia

Marco Calzolai

Andrea Bigagli

Iacopo Rossi

Carlo Giovannucci

Nicola Dreoni

Leonardo Galardi

A description is given of a method of spectral analysis of a radio frequency ultrasonic signal reflected by a structure subjected to echographic examination, comprising the steps of: a) transmitting an ultrasonic excitation signal into a portion of said structure under examination; b) receiving a radio frequency response signal from said structure; c) applying a time-frequency transform to said radio frequency response signal, dividing the radio frequency response signal into a plurality of frequency bands; d) calculating a local spectral parameter from the values of the time-frequency transform.

Method and device for spectral analysis of an echographic signal

The method decomposes the radio frequency signal into sub-bands by filtering, for example with a time-frequency transform. From the coefficients acquired through decomposition a matrix of spectral coefficients is obtained, from which local estimators are obtained, constituted in particular by the coefficients of the interpolating polynomials. The statistical distribution of the local estimators is evaluated in windows overlaid on the ultrasound frame. The conformation of the distribution histograms of the spectral coefficients provides a parameter which, combined with the local estimators, provides weighted local estimators, which contain spectral information useful in the identification of specific structures in the organ subjected to ultrasound analysis.

Method and device for local spectral analysis of an ultrasonic signal

The method comprises the phases of: sending a series of excitation ultrasonic signals to a volume being investigated, by means of an array of transducers aligned in a transverse direction (x), said ultrasonic signals propagating in depth in said volume according to a direction of propagation (y); acquiring, by means of said transducers, signals reflected from reflectors located in the volume being investigated; performing on said reflected signals a transform in the transverse direction from a spatial domain (x,y), defined by said transverse direction (x) and by said direction of propagation (y), to a first transformed domain; applying, in the transformed domain, a two-dimensional transformation, to straighten every curved image (Ip, Ip, Ip) of a reflector in said volume being investigated and make it essentially orthogonal to the direction of propagation (y); compressing, in the transverse direction (x) each of the straightened curves (Im, Im, Im) to concentrate said straightened image in a zone centered at the level of the position of said reflector along said transverse direction (x).

Ultrasound image focusing method and relative ultrasound system

The opto-acoustic generator of ultrasound waves comprises an optical fiber associated to a laser-energy source, and an opto-acoustic transducer which is applied to said fiber and is designed to be impinged upon by the laser beam and to absorb partially the energy, converting it into thermal energy, thus bringing about the formation of ultrasound waves by the thermo-acoustic effect. Said opto-acoustic transducer consists of a layer or film containing prevalently graphite, which is applied on a surface of said optical fiber.

Opto-acoustic generator of ultrasound waves from laser energy supplied via optical fiber

A method of analyzing an ultrasonic signal is described. The method is characterized in that the ultrasonic signal (f(t)) is sampled and digitized and in that a discrete wavelet transform is applied to the sampled and digitized signal to obtain a spectral map of the sampled signal

Method for enhancing the diagnostic power of ultrasonic scanning systems

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Florence, Italy

Elena Biagi