Patent ID: 8690781
Filing Date: 2014-04-08
Classification: G01S,G10K

Abstract:
1. A method for retrospective dynamic transmit beamformation in medical ultrasound imaging system, the method comprising: transmitting first and second transmit beams with different transmit delay profiles having static first and second foci, respectively, the first focus different than the second focus; generating first and second sets of multiple receive data in response to the first and second transmit beams, respectively, each of the receive data having coherent samples representing at least overlapping locations; for each of a plurality of overlapping locations, applying an at least one cycle delay offset to at least one of the coherent samples, the offset being a function of the first focus and a receive focus for the coherent sample; aligning the data with the offset, the offset corresponding to a temporal shift in one of the transmit delay profiles to a tangential intersection with receive wavefronts for the data; combining coherent samples from the first and second sets for each location after applying the offsets, the coherent samples representing each location being a function of the offset; and the different transmit delay profiles having different regions of an aperture having slopes similar to a receive delay slope for the location; and generating an image the image being a function of the combined coherent samples; wherein one of the transmit delay profiles corresponds to temporal evolution of a spherical or cylindrical transmit wavefront to achieve the tangential intersection with one of the receive wavefronts corresponding to a receive focus from an initial time when the receive focus is formed.