Abstract: A method is provided for generating ultrasound transmission waves comprising: a) providing an array of electroacoustic transducer elements each one being connected to an electric excitation signal generator by a dedicated feeding channel; b) feeding at least a part of the electroacoustic transducer elements with a pulsed electric signal having a predetermined frequency, a predetermined amplitude, a predetermined length or duration and a predetermined phase or a predefined delay with respect to the pulsed electric signals fed to the adjacent transducer elements, the said pulsed electric excitation signals comprising a sequence of pulses; c) modulating each or at least part of the pulsed electric signals by feeding to the transducer elements only a predetermined portion of the pulses of the said pulsed electric signals. Modulating is carried out by cutting the duration of each pulse of the pulsed electric excitation signal according to a predetermined time period.

Abstract: A method for quantifying the elasticity of a material by ultrasounds, comprising the generation of one excitation point, for generating a shear wave, a measurement of the shear wave at a plurality of lines of sight placed in a region of interest at different predetermined distances from the first excitation point, the calculation of the speed of the measured shear wave and the assessment, by calculation, of a mean stiffness value of the material in the region of interest on the basis of the measured speed of the shear wave. In the acquired image, a second excitation point is defined, in such a position that the region of interest is interposed between the first excitation point and the second excitation point.

Abstract: A method is provided for generating ultrasound transmission waves comprising: a) providing an array of electroacoustic transducer elements each one being connected to an electric excitation signal generator by a dedicated feeding channel; b) feeding at least a part of the electroacoustic transducer elements with a pulsed electric signal having a predetermined frequency, a predetermined amplitude, a predetermined length or duration and a predetermined phase or a predefined delay with respect to the pulsed electric signals fed to the adjacent transducer elements, the said pulsed electric excitation signals comprising a sequence of pulses; c) modulating each or at least part of the pulsed electric signals by feeding to the transducer elements only a predetermined portion of the pulses of the said pulsed electric signals. Modulating is carried out by cutting the duration of each pulse of the pulsed electric excitation signal according to a predetermined time period.

Abstract: Method for quantifying the elasticity of a material by ultrasounds, comprising the generation of one acoustic disturbance ultrasound beam (10) for the first excitation point (1), for generating a shear wave (11), a measurement of the shear wave (11) at a plurality of lines of sight placed in a region of interest (2) at different predetermined distances from the first excitation point (1), the calculation of the speed of the measured shear wave (11) and the assessment, by calculation, of a mean stiffness value of the material in the region of interest (2) on the basis of the measured speed of the shear wave (11). In the acquired image (3) a second excitation point (4) is defined, in such a position that the region of interest (2) is interposed between the first excitation point (1) and the second excitation point (4).