eprintid: 10150872
rev_number: 7
eprint_status: archive
userid: 699
dir: disk0/10/15/08/72
datestamp: 2022-06-28 10:50:10
lastmod: 2022-06-28 10:50:10
status_changed: 2022-06-28 10:50:10
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: Colchester, Richard J
creators_name: Zhang, Edward Z
creators_name: Beard, Paul C
creators_name: Desjardins, Adrien E
title: High-resolution sub-millimetre diameter side-viewing all-optical ultrasound transducer based on a single dual-clad optical fibre
ispublished: pub
divisions: C05
divisions: F42
divisions: B04
divisions: UCL
note: Copyright © 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement (https://doi.org/10.1364/OA_License_v2#VOR-OA).
abstract: All-optical ultrasound (OpUS), where ultrasound is both generated and received using light, has emerged as a modality well-suited to highly miniaturised applications. In this work we present a proof-of-concept OpUS transducer built onto a single optical fibre with a highly miniaturised lateral dimension (<0.8 mm). A key innovation was to use a dual-clad optical fibre (DCF) to provide multimode light for ultrasound generation and single mode light for ultrasound reception. The transducer comprised a proximal section of DCF spliced to a short section of single mode fibre (SMF). Multimode light was outcoupled at the splice joint and guided within a square capillary to provide excitation for ultrasound generation. Whilst single mode light was guided to the distal tip of the SMF to a plano-concave microresonator for ultrasound reception. The device was capable of generating ultrasound with pressures >0.4 MPa and a corresponding bandwidth >27 MHz. Concurrent ultrasound generation and reception from the transducer enabled imaging via motorised pull-back allowing image acquisition times of 4 s for an aperture of 20 mm. Image resolution was as low as ~50 µm and 190 µm in the axial and lateral extents, respectively, without the need for image reconstruction. Porcine aorta was imaged ex vivo demonstrating detailed ultrasound images. The unprecedented level of miniaturisation along with the high image quality produced by this device represents a radical new paradigm for minimally invasive imaging.
date: 2022-07-01
date_type: published
publisher: Optica Publishing Group
official_url: https://doi.org/10.1364/boe.459486
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 1963426
doi: 10.1364/boe.459486
lyricists_name: Colchester, Richard
lyricists_id: COLCH20
actors_name: Colchester, Richard
actors_id: COLCH20
actors_role: owner
full_text_status: public
publication: Biomedical Optics Express
volume: 13
number: 7
pagerange: 4047-4057
issn: 2156-7085
citation:        Colchester, Richard J;    Zhang, Edward Z;    Beard, Paul C;    Desjardins, Adrien E;      (2022)    High-resolution sub-millimetre diameter side-viewing all-optical ultrasound transducer based on a single dual-clad optical fibre.                   Biomedical Optics Express , 13  (7)   pp. 4047-4057.    10.1364/boe.459486 <https://doi.org/10.1364/boe.459486>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10150872/1/boe-13-7-4047.pdf