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Acoustic resolution photoacoustic Doppler flowmetry using a transducer array: optimising processing for velocity contrast

Bucking, TM; van den Berg, PJ; Balabani, S; Steenbergen, W; Beard, PC; Brunker, J; (2017) Acoustic resolution photoacoustic Doppler flowmetry using a transducer array: optimising processing for velocity contrast. In: Oraevsky, AA and Wang, LV, (eds.) Proceedings Volume 10064, Photons Plus Ultrasound: Imaging and Sensing 2017. SPIE: San Francisco, CA, USA. Green open access

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Abstract

This work demonstrates the first measurements of blood flow velocity using photoacoustic flowmetry (PAF) employing a transducer array. The measurements were made in a flow phantom consisting of a tube (580 μm inner diameter) containing blood flowing steadily at physiological speeds ranging from 3 mm/s to 25 mm/s. Velocity measurements were based on the generation of two successive photoacoustic (PA) signals using two laser pulses with a wavelength of 1064 nm; the PA signals were detected using a 64-element transducer array with a -6 dB detection bandwidth of 11-17 MHz. We developed a processing pipeline to optimise a cross-correlation based velocity measurement method comprising the following processing steps: image reconstruction, filtering, displacement detection, and masking. We found no difference in flow detection accuracy when choosing different image reconstruction algorithms (time reversal, Fourier transformation, and delay-and-sum). High-pass filtering and wallfiltering were however found to be essential pre-processing steps in order to recover the correct displacement information. We masked the calculated velocity map based on the amplitude of the cross-correlation function in order to define the region of interest corresponding to highest signal amplitude. These developments enabled blood flow measurements using a transducer array, bringing PAF one step closer to clinical applicability.

Type: Proceedings paper
Title: Acoustic resolution photoacoustic Doppler flowmetry using a transducer array: optimising processing for velocity contrast
Event: Photons Plus Ultrasound: Imaging and Sensing 2017
Location: San Francisco, CA
Dates: 29 January 2017 - 01 February 2017
ISBN-13: 9781510605701
Open access status: An open access version is available from UCL Discovery
DOI: 10.1117/12.2252939
Publisher version: http://dx.doi.org/10.1117/12.2252939
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Flowmetry, blood flow, photoacoustic, optoacoustic, Doppler, cross-correlation, transducer array, image processing, masking
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1547707
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