Convolutional modeling of diffraction effects in pulse-echo ultrasound imaging | Zendy

T. Douglas Mast | Zendy

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Convolutional modeling of diffraction effects in pulse-echo ultrasound imaging

Author(s) -

T. Douglas Mast

Publication year - 2010

Publication title -

the journal of the acoustical society of america

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.619

H-Index - 187

eISSN - 1520-8524

pISSN - 0001-4966

DOI - 10.1121/1.3462233

Subject(s) - diffraction , acoustics , optics , physics , attenuation , scattering , transducer , speckle pattern , echo (communications protocol) , pulse (music) , computation , computer science , algorithm , detector , computer network

A model is presented for pulse-echo imaging of three-dimensional, linear, weakly-scattering continuum media by ultrasound array transducers. The model accounts for the diffracted fields of focused array subapertures in both transmit and receive modes, multiple transmit and receive focal zones, frequency-dependent attenuation, and aberration caused by mismatched medium and beamformer sound speeds. For a given medium reflectivity function, computation of a B-scan requires evaluation of a depth-dependent transmit/receive beam product, followed by two one-dimensional convolutions and a one-dimensional summation. Numerical results obtained using analytic expressions for transmit and receive beams agree favorably with measured B-scan images and speckle statistics.

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