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 original | English |
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Título de la publicación alojada | 2018 IEEE International Ultrasonics Symposium, IUS 2018 |
Editorial | IEEE Computer Society |
ISBN (versión digital) | 9781538634257 |
DOI | |
Estado | Published - dic. 17 2018 |
Evento | 2018 IEEE International Ultrasonics Symposium, IUS 2018 - Kobe, Japan Duración: oct. 22 2018 → oct. 25 2018 |
Serie de la publicación
Nombre | IEEE International Ultrasonics Symposium, IUS |
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Volumen | 2018-October |
ISSN (versión impresa) | 1948-5719 |
ISSN (versión digital) | 1948-5727 |
Conference
Conference | 2018 IEEE International Ultrasonics Symposium, IUS 2018 |
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País/Territorio | Japan |
Ciudad | Kobe |
Período | 10/22/18 → 10/25/18 |
Nota bibliográfica
Publisher Copyright:© 2018 IEEE.
ASJC Scopus Subject Areas
- Acoustics and Ultrasonics