CPC A61B 8/5207 (2013.01) [A61B 8/0891 (2013.01); A61B 8/14 (2013.01); A61B 8/4444 (2013.01); A61B 8/481 (2013.01); G01S 7/52039 (2013.01); G01S 7/52071 (2013.01); G01S 15/8963 (2013.01)] | 15 Claims |
1. A method for determining an image of a region inside a medium, the image being composed of a plurality of pixels, each pixel having a pixel value corresponding to a physical characteristic representing the nature of the medium, wherein the method comprises for one or more locations inside the region, the following steps:
sending an emitted sequence of ultrasound waves into the medium towards the location, the emitted sequence comprising at least two emitted pulses having different amplitudes,
receiving a received sequence of ultrasound waves from the location, the received sequence comprising at least two received pulses corresponding to echoes of said emitted pulses,
calculating a phase difference between the received pulses relative to the emitted pulses,
determining the image by a succession of sending an emitted sequence of ultrasound waves, receiving a received sequence of ultrasound waves, and calculating a phase difference are repeated several times at each location for providing a plurality of phase differences for each location, and
wherein each pixel value of the image is determined on the bases of the plurality of phase differences at each location, each pixel corresponding to a location in the medium, and each pixel value corresponding to a physical characteristic of said location in the medium.
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