Imperial College London
Alternate

ProfessorEmm MicDrakakis

Faculty of Engineering, Department of Bioengineering

Professor of Bio-Circuits and Systems
 
 
 
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Contact

 

e.drakakis Website

 
 
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Location

 

B207Bessemer BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Peyton:2018:10.1109/TBCAS.2018.2836915,
author = {Peyton, G and Farzaneh, B and Soleimani, H and Boutelle, MG and Drakakis, EM},
doi = {10.1109/TBCAS.2018.2836915},
journal = {IEEE Transactions on Biomedical Circuits and Systems},
pages = {871--883},
title = {Quadrature synthetic aperture beamforming front-end for miniaturized ultrasound imaging},
url = {http://dx.doi.org/10.1109/TBCAS.2018.2836915},
volume = {12},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - A quadrature synthetic aperture front-end receiver for B-mode ultrasound imaging is presented. The receiver targets small-scale imaging applications such as capsule endoscopy and low-cost portable devices. System complexity, area, power consumption, and cost are minimized using synthetic aperture beamforming (SAB), whereby signals are processed in a sequential manner using only a single channel. SAB is combined with quadrature (I/Q) sampling, which further reduces the bandwidth and computational load. I/Q demodulation is carried out using a full custom analog front-end (AFE), which comprises a low-noise, variable gain preamplifier, followed by a passive mixer, programmable gain amplifier (PGA) and active lowpass filter. A novel preamplifier design is proposed, with quasi-exponential time-gain control and low noise (5.42 nV√Hz input-referred noise). Overall, the AFE consumes 7.8 mW (static power) and occupies 1.5 mm × 1.5 mm in AMS 0.35 μm CMOS. Real-time SAB is carried out using a Spartan-6 FPGA, which dynamically apodises and focuses the data by interpolating and applying complex phase rotations to the I/Q samples. For a frame rate of 7 Hz, the power consumption is 3.4 mW/channel across an aperture of 64 elements. B-mode images were obtained using a database of ultrasound signals (2.5 MHz center frequency) derived from a commercial ultrasound machine. The normalized root mean squared error between the quadrature SAB image and the RF reference image was 13%. Image quality/frame rate may be tuned by varying the degree of spatial compounding.
AU  - Peyton,G
AU  - Farzaneh,B
AU  - Soleimani,H
AU  - Boutelle,MG
AU  - Drakakis,EM
DO  - 10.1109/TBCAS.2018.2836915
EP  - 883
PY  - 2018///
SN  - 1932-4545
SP  - 871
TI  - Quadrature synthetic aperture beamforming front-end for miniaturized ultrasound imaging
T2  - IEEE Transactions on Biomedical Circuits and Systems
UR  - http://dx.doi.org/10.1109/TBCAS.2018.2836915
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000442350600015&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/66139
VL  - 12
ER  -
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