US 9,808,219 B2
Coherent spread-spectrum coded waveforms in synthetic aperture image formation
Allan Wegner, Del Mar, CA (US)
Assigned to Decision Sciences Medical Company, LLC, Poway, CA (US)
Filed by Decision Sciences International Corporation, Poway, CA (US)
Filed on Sep. 5, 2014, as Appl. No. 14/479,249.
Claims priority of provisional application 61/877,884, filed on Sep. 13, 2013.
Prior Publication US 2015/0080725 A1, Mar. 19, 2015
Int. Cl. A61B 8/14 (2006.01); A61B 8/00 (2006.01); A61B 8/08 (2006.01); G01S 15/89 (2006.01)
CPC A61B 8/14 (2013.01) [A61B 8/4461 (2013.01); A61B 8/4494 (2013.01); G01S 15/8913 (2013.01); G01S 15/8915 (2013.01); G01S 15/8927 (2013.01); G01S 15/8959 (2013.01); G01S 15/8997 (2013.01); A61B 8/4488 (2013.01); A61B 8/463 (2013.01); A61B 8/5223 (2013.01); A61B 8/54 (2013.01); G01S 15/8945 (2013.01)] 54 Claims
OG exemplary drawing
 
1. A method of producing acoustic waveforms in an acoustic imaging device, comprising:
synthesizing, in one or more waveform synthesizers, one or more composite waveforms to be transmitted toward a target, wherein a composite waveform is formed of a plurality of individual orthogonal coded waveforms that are mutually orthogonal to each other and correspond to different frequency bands, such that each of the individual orthogonal coded waveforms includes a unique frequency with a corresponding phase;
transmitting, from one or more transmitting positions relative to the target, one or more composite acoustic waveforms comprising a plurality of acoustic waveforms, wherein the transmitting includes selecting one or more transducing elements of an array to transduce the plurality of individual orthogonal coded waveforms of the respective one or more composite waveforms into the plurality of corresponding acoustic waveforms of the respective one or more composite acoustic waveforms; and
receiving, at one or more receiving positions relative to the target, returned acoustic waveforms that are returned from at least part of the target corresponding to the transmitted acoustic waveforms, wherein the receiving includes selecting at least some of the transducing elements of the array to receive the returned acoustic waveforms,
wherein the transmitting positions and the receiving positions each include one or both of spatial positions of an array of transducer elements relative to the target and beam phase center positions of the array,
wherein the transmitted acoustic waveforms and the returned acoustic waveforms produce an enlarged effective aperture of the acoustic imaging device.