Laser-generated ultrasound with optical fibres using functionalised carbon nanotube composite coatings

Colchester, Richard J.; Mosse, Charles A.; Bhachu, Davinder S.; Bear, Joseph C.; Carmalt, Claire J.; Parkin, Ivan P.; Treeby, Bradley E.; Papakonstantinou, Ioannis; Desjardins, Adrien E.

doi:10.1063/1.4873678

Cited by 108 publications

(115 citation statements)

References 19 publications

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“…The methods for creating this material and applying it to the optical fiber end face were previously described [12]. Briefly, the composite was created by mixing functionalised CNTs, xylene and PDMS.…”

Section: Setupmentioning

confidence: 99%

“…Recent studies have highlighted the efficacy of composite materials that comprise optical absorbers integrated within elastomers [5,10,11]. The authors recently demonstrated a method for creating ultrasound transmitters at the tip of an optical fiber using a composite material comprised of functionalised multi-walled carbon nanotubes (CNTs) and polydimethylsiloxane (PDMS) [12]. Using optical fibers with 200 µm core diameters, ultrasound pressures of 4.5 MPa were achieved, with corresponding bandwidths of 15 MHz.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we describe a novel miniature fiber optic probe that is based on the two concepts outlined above: a fiber optic transmitter that employs a CNT based absorbing film [12] for generating broadband ultrasound and a fiber-optic FP polymer sensor [21] for receiving it. This combination provides a miniaturised, all-optical ultrasound probe with a bandwidth and a detection sensitivity that permits high resolution pulse-echo ultrasound imaging of soft tissue.…”

Section: Introductionmentioning

confidence: 99%

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Broadband miniature optical ultrasound probe for high resolution vascular tissue imaging

Colchester

Zhang

Mosse

et al. 2015

Biomed. Opt. Express

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107

136

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An all-optical ultrasound probe for vascular tissue imaging was developed. Ultrasound was generated by pulsed laser illumination of a functionalized carbon nanotube composite coating on the end face of an optical fiber. Ultrasound was detected with a Fabry-Pérot (FP) cavity on the end face of an adjacent optical fiber. The probe diameter was < 0.84 mm and had an ultrasound bandwidth of ~20 MHz. The probe was translated across the tissue sample to create a virtual linear array of ultrasound transmit/receive elements. At a depth of 3.5 mm, the axial resolution was 64 µm and the lateral resolution was 88 µm, as measured with a carbon fiber target. Vascular tissues from swine were imaged ex vivo and good correspondence to histology was observed.

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Section: Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Broadband miniature optical ultrasound probe for high resolution vascular tissue imaging

Colchester

Zhang

Mosse

et al. 2015

Biomed. Opt. Express

Self Cite

107

136

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show abstract

“…따라서 오래 전부터 산모와 태아를 진단하는 데 널리 사용되고 있으 며 근래에는 일반 환자의 체내 근육, 힘줄, 장기들의 크기와 구조들을 단층영상으로 가시화하는데 사용되고 있다 [3] . [4] , 금속 미세패턴 (Au nanoparticle) [5] 또는 CNT (carbon nanotube)를 PDMS (Polydimethylsiloxane)와 혼합하는 방법에 기반하고 있다 [6][7][8][9] . …”

Section: 서 론unclassified

Optoacoustic Ultrasound Generator Based on Nanostructured Germanium

Yoon¹,

Heo

2015

Korean Journal of Optics and Photonics

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We have fabricated an optoacoustic ultrasound generator based on nanostructured germanium (Ge). Ge thin films were deposited via e-beam evaporation and then etched using a metal-assisted chemical (MAC) method to form nanostructured Ge films. The measured intensity of ultrasound from the nanostructured Ge covered with PDMS was about 3 times stronger than that of 100-nm-thick chromium (Cr). When the nanostructured Ge was embedded in the PDMS, the intensity of ultrasound became 8.5 times as strong compared to the 100-nm-thick Cr.

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“…As previously described in Refs. [14,15], the coating comprised multi-walled carbon nanotubes as optical absorbers and polydimethylsiloxane (PDMS) as an elastomeric host. The coating was applied to the distal end of an optical fibre (core diameter: 200 μm) with dip coating.…”

Section: Ultrasonic Tracking Systemmentioning

confidence: 99%

Ultrasonic Needle Tracking with a Fibre-Optic Ultrasound Transmitter for Guidance of Minimally Invasive Fetal Surgery

Xia

Noimark

Ourselin

et al. 2017

Lecture Notes in Computer Science

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Ultrasound imaging is widely used for guiding minimally invasive procedures, including fetal surgery. Visualisation of medical devices such as medical needles is critically important and it remains challenging in many clinical contexts. During in-plane insertions, a needle can have poor visibility at steep insertion angles and at large insertion depths. During out-of-plane insertions, the needle tip can have a similar ultrasonic appearance to the needle shaft when it intersects with the ultrasound imaging plane. When the needle tip is not accurately identified, it can damage critical structures, with potentially severe consequences, including loss of pregnancy. In this paper, we present a tracking system to directly visualise the needle tip with an ultrasonic beacon. The waves transmitted by the beacon were received by an external ultrasound imaging probe. Pairs of coregistered images were acquired in rapid succession with this probe: a photoacoustic image obtained with the system in receive-only mode, and a conventional B-mode ultrasound image. The beacon comprised a custom elastomeric nanocomposite coating at the distal end of an optical fibre, which was positioned within the lumen of a commercial 22 gauge needle. Delivery of pulsed light to the coating resulted in the photoacoustic generation of ultrasonic waves. The measured tracking accuracies in water in the axial and lateral dimensions were 0.39±0.19 mm and 1.85±0.29 mm, respectively. To obtain a preliminary indication of the clinical potential of this ultrasonic needle tracking system, needle insertions were performed in an in vivo fetal sheep model. The results demonstrate that ultrasonic needle tracking with a fibre-optic transmitter is feasible in a clinically realistic fetal surgery environment, and that it could be useful to guide minimally invasive procedures by providing accurate visualisation of the medical device tip.

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Laser-generated ultrasound with optical fibres using functionalised carbon nanotube composite coatings

Cited by 108 publications

References 19 publications

Broadband miniature optical ultrasound probe for high resolution vascular tissue imaging

Broadband miniature optical ultrasound probe for high resolution vascular tissue imaging

Optoacoustic Ultrasound Generator Based on Nanostructured Germanium

Ultrasonic Needle Tracking with a Fibre-Optic Ultrasound Transmitter for Guidance of Minimally Invasive Fetal Surgery

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