Sparse Orthogonal Diverging Wave Imaging on a High-Frequency Phased Array

Christopher Samson, Eric Simpson, Robert Adamson, Jeremy A. Brown

Producción científica: Capítulo en Libro/Reporte/Acta de conferenciaContribución a la conferencia

3 Citas (Scopus)

Resumen

A new ultrafast encoding scheme for phased array imaging named sparse orthogonal diverging wave imaging (SODWI) is presented. Hadamard codes that encode the array elements are surfed on top of a diverging wave generated from the full aperture during transmit. A complete set of orthogonal Hadamard codes is equivalent to the number of elements on the imaging array. From within the full set of codes, a subset can be sparsely selected to increase frame rate and the tradeoff between frame rate and image quality has been investigated. The technique was implemented on a 64-channel custom beamforming platform with a 40 MHz phased array. When a complete set of 64 codes were used, SODWI exhibits a 3-dB improvement in SNR over traditional focused imaging. Each time the number of transmit codes is halved, the SODWI SNR is reduced by an average of 3-dB and the level of secondary lobes are suppressed by an average of 3.5-dB less. The FWHM of the directivity functions are increased to 136 θ , 160 θ , and 140 θ , from 136 θ , 56 θ , and 30 θ when 64, 32, and 16 Hadamard codes are used without diverging waves. For 8 and 4 Hadamard codes, the signal energy spans 120θ when surfed on a diverging source, whereas the pressure from a plane wave source drops to less than 10% before spanning 40 θ in both cases.

Idioma originalEnglish
Título de la publicación alojada2018 IEEE International Ultrasonics Symposium, IUS 2018
EditorialIEEE Computer Society
ISBN (versión digital)9781538634257
DOI
EstadoPublished - dic. 17 2018
Evento2018 IEEE International Ultrasonics Symposium, IUS 2018 - Kobe, Japan
Duración: oct. 22 2018oct. 25 2018

Serie de la publicación

NombreIEEE International Ultrasonics Symposium, IUS
Volumen2018-October
ISSN (versión impresa)1948-5719
ISSN (versión digital)1948-5727

Conference

Conference2018 IEEE International Ultrasonics Symposium, IUS 2018
País/TerritorioJapan
CiudadKobe
Período10/22/1810/25/18

Nota bibliográfica

Publisher Copyright:
© 2018 IEEE.

ASJC Scopus Subject Areas

  • Acoustics and Ultrasonics

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