Fabrication and performance of a miniaturized 64-element high-frequency endoscopic phased array

A. Bezanson, R. Adamson, J. A. Brown

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

7 Citas (Scopus)

Resumen

We have developed a 42 MHz, 64-element phased array transducer packaged in a 2.5 mm by 3.1 mm endoscopic form factor. The array is a forward looking semi-kerfed design based on a 0.68Pb(Mg1/3Nb2/3)O 3-0.32PbTiO3 (PMN-32%PT) single-crystal wafer with an element-to-element pitch of 38 microns. In order to achieve a miniaturized form factor, a novel technique of wire bonding the array elements to a polyimide flexible circuit board oriented parallel to the forward looking ultrasound beam and perpendicular to the array was developed. A technique of dicing partially into the back of the array was also implemented in order to improve the directivity of the array elements. The array was fabricated with a single layer P(VDF-TrFE)-copolymer matching layer and a polymethylpentene (TPX) lens for passive elevation focusing to a depth of 7 mm. The two-way -6 dB pulse bandwidth was measured to be 55% and the average electromechanical coupling (k T) for the individual elements was measured to be 0.62. The one-way -3 dB directivity from several array elements was measured and found to be ± 20 degrees, which was shown to be an improvement over an identical kerfless array. The -3 dB one-way elevation focus resulting from the TPX lens was measured to be 152 microns at the focal depth, and the focused lateral resolution was measured to be 80 microns at a steering angle of 0°. To generate beam profiles and images the probe was connected to a Visualsonics Vevo 2100 imaging platform which was reprogrammed to allow for phased array transmit beamforming and receive data collection. The collected RF data was then processed offline using a Matlab script to generate sector images. Focused one-way transmit radiation patterns were collected with a needle hydrophone. Two-way images were generated with a dynamic range of 60 dB for wire phantoms in water and a tissue-equivalent medium. Finally, ex-vivo tissue images were generated of porcine brain tissue.

Idioma originalEnglish
Título de la publicación alojada2013 IEEE International Ultrasonics Symposium, IUS 2013
Páginas765-768
Número de páginas4
DOI
EstadoPublished - 2013
Evento2013 IEEE International Ultrasonics Symposium, IUS 2013 - Prague, Czech Republic
Duración: jul. 21 2013jul. 25 2013

Serie de la publicación

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

Conference

Conference2013 IEEE International Ultrasonics Symposium, IUS 2013
País/TerritorioCzech Republic
CiudadPrague
Período7/21/137/25/13

ASJC Scopus Subject Areas

  • Acoustics and Ultrasonics

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