Traitement en cours

Veuillez attendre...

Paramétrages

Paramétrages

Aller à Demande

1. WO2020112586 - IMAGERIE PAR ONDE DE CISAILLEMENT HARMONIQUE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

1 A method of performing shear wave elastography in tissue, comprising the steps of:

providing a single array transducer;

transmitting successively a series of ultrasound push pulses in the tissue in a region of interest (ROI) using the single array transducer, acoustic intensities of the push pulses being sinusoidally modulated with a frequency;

each push pulse generating an acoustic radiation force that pushes the tissue thus creating an individual shear wave having an amplitude and propagating through the tissue, the amplitude changing positively proportionally to the intensities of the push pulses, the successively created individual shear waves with different amplitudes summing together to form a (xmtinuous* narrowband smnmed diear wave with a single frequency, the single frequency being the same as the modulation frequency of the push pulses.

2. The method according to claim 1, further comprising:

transmitting imaging pulses using the single array transducer between the push pulses; and

imaging/detecting the continuous, narrowband summed shear wave.

3. The method according to claim 2, wherein imaging/detecting the continuous, narrowband summed shear wave comprises generating maps of shear wave speed or shear modulus using the imaging pulses.

4. The method according to claim 3 , wherein the maps generated are 2D field* of-yiew (FOV) maps.

5. The method according to claim 1, wherein the single array transducer is a linear, 1 ,SD, or 2D array transducer.

6. The method according to any of the preceding claims, wherein the intensities of the push pulses are modulated by changing magnitudes of the applied voltage, pulse durations, or aperture sizes (a number of the elements in the array) of the transducer.

7. The method according to any of claims 2 to 6, wherein part dr all of elements of the single array transducer are used to transmit tfre imaging pulses.

8. The method according to any of claims 1 to 7, wherein the push pulses are transmitted at a focal position adjacent the ROL

9. The method according to any of claims 2 to 8, wherein die imaging pulses are plane wave pulses.

10. The method according to any of claims 1 to 9, wherein at least two push pulses are transmitted per cycle.

11. The method according to any of claims 1 to 10, wherein at least four push pulses are transmitted per cycle.

12, The method according to any of daims 2 to 11, wherein at least two image pulses are transmitted between two subsequent push pulses;

13. The method according to any of claims 2 to 12, wherein compounding plane wave pulses with three angles (-15 *, 0 * and 15") are used.

14. The method according to any of the preceding claims, wherein a lower limit of the frequency is chosen such that at least two wavelengths are in the ROL