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. Author manuscript; available in PMC: 2022 Jan 1.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2020 Dec 23;68(1):164–177. doi: 10.1109/TUFFC.2020.3001848

Fig. 1.

Fig. 1.

Sparse matrix construction. (a) 3D matrix of distance from the pixel to transducer element in sample units calculated for an imaging array with 128 elements, and a reconstructed image of 2000×128=256000 pixels. (b) 3D matrix of re-indexed distance to follow data output by Verasonics Vantage. (c) Standard basis vectors used for the DAS iterative calculation. (d) Matrix resulting from DAS operation on a given standard basis vector. (e) Sparse matrix values allocation following 2D representation.