Analog Gradient Beamformer for a Wireless Ultrasound Scanner.

Tommaso di Ianni, Martin Christian Hemmsen, Jan Peter Bagge, Henrik Jensen, Nitsan Vardi, Jørgen Arendt Jensen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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Abstract

This paper presents a novel beamformer architecture for a low-cost receiver front-end, and investigates if the
image quality can be maintained. The system is oriented to the development of a hand-held wireless ultrasound
probe based on Synthetic Aperture Sequential Beamforming, and has the advantage of effectively reducing
circuit complexity and power dissipation. The array of transducers is divided into sub-apertures, in which the
signals from the single channels are aligned through a network of cascaded gradient delays, and summed in
the analog domain before A/D conversion. The delay values are quantized to simplify the shifting unit, and a
single A/D converter is needed for each sub-aperture yielding a compact, low-power architecture that can be
integrated in a single chip. A simulation study was performed using a 3.75 MHz convex array, and the point
spread function (PSF) for different configurations was evaluated in terms of lateral full-width-at-half-maximum
(FWHM) and −20 dB cystic resolution (CR). Several setups were simulated varying the sub-aperture size N and
the quantization step, and design constraints were obtained comparing the PSF to that of an ideal non-quantized
system. The PSF is shown for N = 32 with a quantization step of 12 ns. For this configuration, the FWHM is
degraded by 0.25% and the CR is 8.70% lower compared to the ideal situation. The results demonstrate that
the gradient beamformer provides an adequate image quality, and open the way to a fully-integrated chip for a
compact, low-cost, wireless ultrasound probe.
Original languageEnglish
Title of host publicationProceedings of SPIE
EditorsNeb Duric, Brecht Heyde
Number of pages8
Volume9790
PublisherSPIE - International Society for Optical Engineering
Publication date2016
Article number979010
DOIs
Publication statusPublished - 2016
EventSPIE Medical Imaging 2016 : Ultrasonic Imaging and Tomography - Town & Country Resort and Convention Cente, San Diego, United States
Duration: 27 Feb 20163 Mar 2016
Conference number: 9790
https://spie.org/MI/conferencedetails/ultrasonic-imaging

Conference

ConferenceSPIE Medical Imaging 2016
Number9790
LocationTown & Country Resort and Convention Cente
CountryUnited States
CitySan Diego
Period27/02/201603/03/2016
Internet address

Keywords

  • Analog beamformer
  • Portable scanner
  • Synthetic Aperture Sequential Beamforming
  • Point-of-care ultrasound

Cite this

di Ianni, T., Hemmsen, M. C., Bagge, J. P., Jensen, H., Vardi, N., & Jensen, J. A. (2016). Analog Gradient Beamformer for a Wireless Ultrasound Scanner. In N. Duric, & B. Heyde (Eds.), Proceedings of SPIE (Vol. 9790). [979010] SPIE - International Society for Optical Engineering. https://doi.org/10.1117/12.2216238
di Ianni, Tommaso ; Hemmsen, Martin Christian ; Bagge, Jan Peter ; Jensen, Henrik ; Vardi, Nitsan ; Jensen, Jørgen Arendt. / Analog Gradient Beamformer for a Wireless Ultrasound Scanner. Proceedings of SPIE. editor / Neb Duric ; Brecht Heyde. Vol. 9790 SPIE - International Society for Optical Engineering, 2016.
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title = "Analog Gradient Beamformer for a Wireless Ultrasound Scanner.",
abstract = "This paper presents a novel beamformer architecture for a low-cost receiver front-end, and investigates if theimage quality can be maintained. The system is oriented to the development of a hand-held wireless ultrasoundprobe based on Synthetic Aperture Sequential Beamforming, and has the advantage of effectively reducingcircuit complexity and power dissipation. The array of transducers is divided into sub-apertures, in which thesignals from the single channels are aligned through a network of cascaded gradient delays, and summed inthe analog domain before A/D conversion. The delay values are quantized to simplify the shifting unit, and asingle A/D converter is needed for each sub-aperture yielding a compact, low-power architecture that can beintegrated in a single chip. A simulation study was performed using a 3.75 MHz convex array, and the pointspread function (PSF) for different configurations was evaluated in terms of lateral full-width-at-half-maximum(FWHM) and −20 dB cystic resolution (CR). Several setups were simulated varying the sub-aperture size N andthe quantization step, and design constraints were obtained comparing the PSF to that of an ideal non-quantizedsystem. The PSF is shown for N = 32 with a quantization step of 12 ns. For this configuration, the FWHM isdegraded by 0.25{\%} and the CR is 8.70{\%} lower compared to the ideal situation. The results demonstrate thatthe gradient beamformer provides an adequate image quality, and open the way to a fully-integrated chip for acompact, low-cost, wireless ultrasound probe.",
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di Ianni, T, Hemmsen, MC, Bagge, JP, Jensen, H, Vardi, N & Jensen, JA 2016, Analog Gradient Beamformer for a Wireless Ultrasound Scanner. in N Duric & B Heyde (eds), Proceedings of SPIE. vol. 9790, 979010, SPIE - International Society for Optical Engineering, SPIE Medical Imaging 2016 , San Diego, United States, 27/02/2016. https://doi.org/10.1117/12.2216238

Analog Gradient Beamformer for a Wireless Ultrasound Scanner. / di Ianni, Tommaso; Hemmsen, Martin Christian; Bagge, Jan Peter; Jensen, Henrik; Vardi, Nitsan; Jensen, Jørgen Arendt.

Proceedings of SPIE. ed. / Neb Duric; Brecht Heyde. Vol. 9790 SPIE - International Society for Optical Engineering, 2016. 979010.

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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di Ianni T, Hemmsen MC, Bagge JP, Jensen H, Vardi N, Jensen JA. Analog Gradient Beamformer for a Wireless Ultrasound Scanner. In Duric N, Heyde B, editors, Proceedings of SPIE. Vol. 9790. SPIE - International Society for Optical Engineering. 2016. 979010 https://doi.org/10.1117/12.2216238