Experimental verification of a split-aperture transmit beamforming technique for suppressing grating lobes in large pitch phased arrays

Z. Torbatian, R. Adamson, M. Bance, J. A. Brown

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

4 Citas (Scopus)

Resumen

Phased array ultrasound transducers are desirable in some applications where large field-of-view is required from a small aperture. Fabrication of high-frequency phased array transducers is challenging due to the inter-element pitch constraint (∼0.5 λ) to avoid large grating lobe artifacts. Phase coherence imaging (PCI) has been introduced as a method for suppressing grating lobes in large-pitch arrays, however, it is not as effective when the grating lobe echoes have large overlap in the time-domain. In previous work we suggested a technique called split-aperture transmit beamforming to increase the effectiveness of PCI in grating lobe suppression of these arrays and used computer simulation to evaluate its effectiveness. In the present work we report on the experimental verification of the technique using a commercially available high-frequency ultrasound linear array system (Vevo 2100, Visualsonics). We demonstrate that by using only two split-aperture transmit beamforming events along with PCI we can effectively suppress the grating lobes resulting from a 50 MHz, 64-element, 1.26 λ pitch phased array to less than 60 db for a wire-phantom placed at 25 degrees from the center of transducer. We further show that this grating lobe suppression greatly improves the contrast in tissue phantom. Finally, we show that the measured beamformed radiation patterns are consistent with simulations.

Idioma originalEnglish
Título de la publicación alojada2011 IEEE International Ultrasonics Symposium, IUS 2011
Páginas1139-1142
Número de páginas4
DOI
EstadoPublished - 2011
Evento2011 IEEE International Ultrasonics Symposium, IUS 2011 - Orlando, FL, United States
Duración: oct. 18 2011oct. 21 2011

Serie de la publicación

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

Conference

Conference2011 IEEE International Ultrasonics Symposium, IUS 2011
País/TerritorioUnited States
CiudadOrlando, FL
Período10/18/1110/21/11

ASJC Scopus Subject Areas

  • Acoustics and Ultrasonics

Huella

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Citar esto

Torbatian, Z., Adamson, R., Bance, M., & Brown, J. A. (2011). Experimental verification of a split-aperture transmit beamforming technique for suppressing grating lobes in large pitch phased arrays. En 2011 IEEE International Ultrasonics Symposium, IUS 2011 (pp. 1139-1142). Artículo 6293607 (IEEE International Ultrasonics Symposium, IUS). https://doi.org/10.1109/ULTSYM.2011.0280