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Mathews SJ, Little C, Zhang E, Beard P, Mastracci T, Rakhit R, Desjardins AE. Bend-insensitive fiber optic ultrasonic tracking probe for cardiovascular interventions. Med Phys 2023; 50:3490-3497. [PMID: 36842082 PMCID: PMC10615325 DOI: 10.1002/mp.16334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2022] [Revised: 02/13/2023] [Accepted: 02/18/2023] [Indexed: 02/27/2023] Open
Abstract
BACKGROUND Transesophageal echocardiography (TEE) is widely used to guide medical device placement in minimally invasive cardiovascular procedures. However, visualization of the device tip with TEE can be challenging. Ultrasonic tracking, enabled by an integrated fiber optic ultrasound sensor (FOUS) that receives transmissions from the TEE probe, is very well suited to improving device localization in this context. The problem addressed in this study is that tight deflections of devices such as a steerable guide catheter can result in bending of the FOUS beyond its specifications and a corresponding loss of ultrasound sensitivity. PURPOSE A bend-insensitive FOUS was developed, and its utility with ultrasonic tracking of a steerable tip during TEE-based image guidance was demonstrated. METHODS Fiberoptic ultrasound sensors were fabricated using both standard and bend insensitive single mode fibers and subjected to static bending at the distal end. The interference transfer function and ultrasound sensitivities were compared for both types of FOUS. The bend-insensitive FOUS was integrated within a steerable guide catheter, which served as an exemplar device; the signal-to-noise ratio (SNR) of tracking signals from the catheter tip with a straight and a fully deflected distal end were measured in a cardiac ultrasound phantom for over 100 frames. RESULTS With tight bending at the distal end (bend radius < 10 mm), the standard FOUS experienced a complete loss of US sensitivity due to high attenuation in the fiber, whereas the bend-insensitive FOUS had largely unchanged performance, with a SNR of 47.7 for straight fiber and a SNR of 36.8 at a bend radius of 3.0 mm. When integrated into the steerable guide catheter, the mean SNRs of the ultrasonic tracking signals recorded with the catheter in a cardiac phantom were similar for straight and fully deflected distal ends: 195 and 163. CONCLUSION The FOUS fabricated from bend-insensitive fiber overcomes the bend restrictions associated with the FOUS fabricated from standard single mode fiber, thereby enabling its use in ultrasonic tracking in a wide range of cardiovascular devices.
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Affiliation(s)
- Sunish J. Mathews
- Wellcome/EPSRC Centre for Interventional and Surgical SciencesUniversity College LondonLondonUK
- Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonUK
| | - Callum Little
- Department of CardiologyImperial College Healthcare NHS Foundation TrustLondonUK
| | - Edward Zhang
- Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonUK
| | - Paul Beard
- Wellcome/EPSRC Centre for Interventional and Surgical SciencesUniversity College LondonLondonUK
- Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonUK
| | - Tara Mastracci
- Department of CardiologyRoyal Free London NHS Foundation TrustLondonUK
| | - Roby Rakhit
- Department of CardiologyRoyal Free London NHS Foundation TrustLondonUK
| | - Adrien E. Desjardins
- Wellcome/EPSRC Centre for Interventional and Surgical SciencesUniversity College LondonLondonUK
- Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonUK
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Aytac Kipergil E, Martin E, Mathews SJ, Papakonstantinou I, Alles EJ, Desjardins AE. Fiber-optic hydrophone for detection of high-intensity ultrasound waves. Opt Lett 2023; 48:2615-2618. [PMID: 37186722 PMCID: PMC10575604 DOI: 10.1364/ol.488862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 04/06/2023] [Accepted: 04/13/2023] [Indexed: 05/17/2023]
Abstract
Fiber-optic hydrophones (FOHs) are widely used to detect high-intensity focused ultrasound (HIFU) fields. The most common type consists of an uncoated single-mode fiber with a perpendicularly cleaved end face. The main disadvantage of these hydrophones is their low signal-to-noise ratio (SNR). To increase the SNR, signal averaging is performed, but the associated increased acquisition times hinder ultrasound field scans. In this study, with a view to increasing SNR while withstanding HIFU pressures, the bare FOH paradigm is extended to include a partially reflective coating on the fiber end face. Here, a numerical model based on the general transfer-matrix method was implemented. Based on the simulation results, a single-layer, 172 nm TiO2-coated FOH was fabricated. The frequency range of the hydrophone was verified from 1 to 30 MHz. The SNR of the acoustic measurement with the coated sensor was 21 dB higher than that of the uncoated one. The coated sensor successfully withstood a peak positive pressure of 35 MPa for 6000 pulses.
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Affiliation(s)
- Esra Aytac Kipergil
- Department of Medical Physics and Biomedical Engineering, University College London, Malet Place Engineering Building, London WC1E 6BT, UK
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences (WEISS), Charles Bell House, University College London, 43–45 Foley Street, London W1W 7TY, UK
| | - Eleanor Martin
- Department of Medical Physics and Biomedical Engineering, University College London, Malet Place Engineering Building, London WC1E 6BT, UK
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences (WEISS), Charles Bell House, University College London, 43–45 Foley Street, London W1W 7TY, UK
| | - Sunish J. Mathews
- Department of Medical Physics and Biomedical Engineering, University College London, Malet Place Engineering Building, London WC1E 6BT, UK
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences (WEISS), Charles Bell House, University College London, 43–45 Foley Street, London W1W 7TY, UK
| | - Ioannis Papakonstantinou
- Photonic Innovations Lab, Department of Electronic and Electrical Engineering, University College London, Roberts Building, London WC1E 7JE, UK
| | - Erwin J. Alles
- Department of Medical Physics and Biomedical Engineering, University College London, Malet Place Engineering Building, London WC1E 6BT, UK
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences (WEISS), Charles Bell House, University College London, 43–45 Foley Street, London W1W 7TY, UK
| | - Adrien E. Desjardins
- Department of Medical Physics and Biomedical Engineering, University College London, Malet Place Engineering Building, London WC1E 6BT, UK
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences (WEISS), Charles Bell House, University College London, 43–45 Foley Street, London W1W 7TY, UK
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Mathews SJ, Shakir DI, Mosse CA, Xia W, Zhang EZ, Beard PC, West SJ, David AL, Ourselin S, Vercauteren T, Desjardins A. Ultrasonic Needle Tracking with Dynamic Electronic Focusing. Ultrasound Med Biol 2022; 48:520-529. [PMID: 34974926 DOI: 10.1016/j.ultrasmedbio.2021.11.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 09/28/2021] [Accepted: 11/17/2021] [Indexed: 06/14/2023]
Abstract
Accurate identification of the needle tip is a key challenge with ultrasound-guided percutaneous interventions in regional anaesthesia, foetal surgery and cardiovascular medicine. In this study, we developed an ultrasonic needle tracking system in which the measured needle tip location was used to set the electronic focus of the external ultrasound imaging probe. In this system, needle tip tracking was enabled with a fibre-optic ultrasound sensor that was integrated into a needle stylet, and the A-lines recorded by the sensor were processed to generate tracking images of the needle tip. The needle tip position was estimated from the tracking images. The dependency of the tracking image on the electronic focal depth of the external ultrasound imaging probe was studied in a water bath and with needle insertions into a clinical training phantom. The variability in the estimated tracked position of the needle tip, with the needle tip at fixed depths in the imaging plane across a depth range from 0.5 to 7.5 cm, was studied. When the electronic focus was fixed, the variability of tracked position was found to increase with distance from that focus. The variability with the fixed focus was found to depend on the the relative distance between the needle tip and focal depth. It was found that with dynamic focusing, the maximum variability of tracked position was below 0.31 mm, as compared with 3.97 mm for a fixed focus.
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Affiliation(s)
- Sunish J Mathews
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, London, UK; Department of Medical Physics and Biomedical Engineering, University College London, UK.
| | - Dzhoshkun I Shakir
- Department of Medical Physics and Biomedical Engineering, University College London, UK; School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK
| | - Charles A Mosse
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, London, UK; Department of Medical Physics and Biomedical Engineering, University College London, UK
| | - Wenfeng Xia
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK
| | - Edward Z Zhang
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, London, UK; Department of Medical Physics and Biomedical Engineering, University College London, UK
| | - Paul C Beard
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, London, UK; Department of Medical Physics and Biomedical Engineering, University College London, UK
| | - Simeon J West
- Department of Anaesthesia, University College Hospital, London, UK
| | - Anna L David
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, London, UK; Institute for Women's Health, University College London, London, UK
| | - Sebastien Ourselin
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK
| | - Tom Vercauteren
- School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK
| | - Adrien Desjardins
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, London, UK; Department of Medical Physics and Biomedical Engineering, University College London, UK
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Bodian S, Colchester RJ, Macdonald TJ, Ambroz F, Briceno de Gutierrez M, Mathews SJ, Fong YMM, Maneas E, Welsby KA, Gordon RJ, Collier P, Zhang EZ, Beard PC, Parkin IP, Desjardins AE, Noimark S. CuInS 2 Quantum Dot and Polydimethylsiloxane Nanocomposites for All-Optical Ultrasound and Photoacoustic Imaging. Adv Mater Interfaces 2021; 8:2100518. [PMID: 34777946 PMCID: PMC8573612 DOI: 10.1002/admi.202100518] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 06/28/2021] [Indexed: 05/13/2023]
Abstract
Dual-modality imaging employing complementary modalities, such as all-optical ultrasound and photoacoustic imaging, is emerging as a well-suited technique for guiding minimally invasive surgical procedures. Quantum dots are a promising material for use in these dual-modality imaging devices as they can provide wavelength-selective optical absorption. The first quantum dot nanocomposite engineered for co-registered laser-generated ultrasound and photoacoustic imaging is presented. The nanocomposites developed, comprising CuInS2 quantum dots and medical-grade polydimethylsiloxane (CIS-PDMS), are applied onto the distal ends of miniature optical fibers. The films exhibit wavelength-selective optical properties, with high optical absorption (> 90%) at 532 nm for ultrasound generation, and low optical absorption (< 5%) at near-infrared wavelengths greater than 700 nm. Under pulsed laser irradiation, the CIS-PDMS films generate ultrasound with pressures exceeding 3.5 MPa, with a corresponding bandwidth of 18 MHz. An ultrasound transducer is fabricated by pairing the coated optical fiber with a Fabry-Pérot (FP) fiber optic sensor. The wavelength-selective nature of the film is exploited to enable co-registered all-optical ultrasound and photoacoustic imaging of an ink-filled tube phantom. This work demonstrates the potential for quantum dots as wavelength-selective absorbers for all-optical ultrasound generation.
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Affiliation(s)
- Semyon Bodian
- Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonWC1E 6BTUK
- Wellcome/ESPRC Centre for Surgical and Interventional SciencesUniversity College LondonCharles Bell House, 67–73 Riding House StreetLondonW1W 7EJUK
- Materials Chemistry CentreDepartment of ChemistryUniversity College London20 Gordon StreetLondonWC1H 0AJUK
| | - Richard J. Colchester
- Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonWC1E 6BTUK
- Wellcome/ESPRC Centre for Surgical and Interventional SciencesUniversity College LondonCharles Bell House, 67–73 Riding House StreetLondonW1W 7EJUK
| | - Thomas J. Macdonald
- Materials Chemistry CentreDepartment of ChemistryUniversity College London20 Gordon StreetLondonWC1H 0AJUK
- Department of Chemistry and Centre for Processable ElectronicsImperial College LondonLondonW12 0BZUK
| | - Filip Ambroz
- Materials Chemistry CentreDepartment of ChemistryUniversity College London20 Gordon StreetLondonWC1H 0AJUK
| | | | - Sunish J. Mathews
- Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonWC1E 6BTUK
- Wellcome/ESPRC Centre for Surgical and Interventional SciencesUniversity College LondonCharles Bell House, 67–73 Riding House StreetLondonW1W 7EJUK
| | - Yu Man Mandy Fong
- Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonWC1E 6BTUK
- Wellcome/ESPRC Centre for Surgical and Interventional SciencesUniversity College LondonCharles Bell House, 67–73 Riding House StreetLondonW1W 7EJUK
- Materials Chemistry CentreDepartment of ChemistryUniversity College London20 Gordon StreetLondonWC1H 0AJUK
| | - Efthymios Maneas
- Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonWC1E 6BTUK
- Wellcome/ESPRC Centre for Surgical and Interventional SciencesUniversity College LondonCharles Bell House, 67–73 Riding House StreetLondonW1W 7EJUK
| | - Kathryn A. Welsby
- Central Laser FacilityHarwell Science and Innovation CampusChiltonDidcotOX11 0DEUK
| | - Ross J. Gordon
- Johnson Matthey Technology CentreSonning CommonReadingRG4 9NHUK
| | - Paul Collier
- Johnson Matthey Technology CentreSonning CommonReadingRG4 9NHUK
| | - Edward Z. Zhang
- Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonWC1E 6BTUK
| | - Paul C. Beard
- Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonWC1E 6BTUK
- Wellcome/ESPRC Centre for Surgical and Interventional SciencesUniversity College LondonCharles Bell House, 67–73 Riding House StreetLondonW1W 7EJUK
| | - Ivan P. Parkin
- Materials Chemistry CentreDepartment of ChemistryUniversity College London20 Gordon StreetLondonWC1H 0AJUK
| | - Adrien E. Desjardins
- Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonWC1E 6BTUK
- Wellcome/ESPRC Centre for Surgical and Interventional SciencesUniversity College LondonCharles Bell House, 67–73 Riding House StreetLondonW1W 7EJUK
| | - Sacha Noimark
- Department of Medical Physics and Biomedical EngineeringUniversity College LondonLondonWC1E 6BTUK
- Wellcome/ESPRC Centre for Surgical and Interventional SciencesUniversity College LondonCharles Bell House, 67–73 Riding House StreetLondonW1W 7EJUK
- Materials Chemistry CentreDepartment of ChemistryUniversity College London20 Gordon StreetLondonWC1H 0AJUK
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Mathews SJ, Little C, Loder CD, Rakhit RD, Xia W, Zhang EZ, Beard PC, Finlay MC, Desjardins AE. All-optical dual photoacoustic and optical coherence tomography intravascular probe. Photoacoustics 2018; 11:65-70. [PMID: 30112279 PMCID: PMC6092552 DOI: 10.1016/j.pacs.2018.07.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 07/16/2018] [Accepted: 07/17/2018] [Indexed: 05/09/2023]
Abstract
Intravascular imaging in percutaneous coronary interventions can be an invaluable tool in the treatment of coronary artery disease. It is of significant interest to provide molecular imaging contrast that is complementary to structural contrast provided by optical coherence tomography (OCT) and intravascular ultrasound imaging (IVUS). In this study, we developed a dual-modality intravascular imaging probe comprising a commercial OCT catheter and a high sensitivity fiber optic ultrasound sensor, to provide both photoacoustic (PA) and OCT imaging. With PA imaging, the lateral resolution varied from 18 μm to 40 μm; the axial resolution was consistently in the vicinity of 45 μm. We demonstrated the clinical potential of the probe with 2-D circumferential PA and OCT imaging, and with multispectral PA imaging.
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Affiliation(s)
- Sunish J. Mathews
- Department of Medical Physics and Biomedical Engineering, University College London, UK
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, University College London, UK
| | - Callum Little
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, University College London, UK
- Department of Cardiology, Royal Free Hospital, London, UK
| | | | - Roby D. Rakhit
- Department of Cardiology, Royal Free Hospital, London, UK
| | - Wenfeng Xia
- Department of Medical Physics and Biomedical Engineering, University College London, UK
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, University College London, UK
| | - Edward Z. Zhang
- Department of Medical Physics and Biomedical Engineering, University College London, UK
| | - Paul C. Beard
- Department of Medical Physics and Biomedical Engineering, University College London, UK
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, University College London, UK
| | - Malcolm C. Finlay
- Department of Medical Physics and Biomedical Engineering, University College London, UK
- William Harvey Cardiovascular Research Institute, Queen Mary University of London, UK
- Barts Heart Centre, London, UK
| | - Adrien E. Desjardins
- Department of Medical Physics and Biomedical Engineering, University College London, UK
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, University College London, UK
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Chandraratna PA, Nimalasuriya AR, Vlachonassios KD, Mathews SJ, Kedes W, Marwah OS, Saad M. Usefulness of the response of flow velocity in the left anterior descending coronary artery to the cold pressor test for evaluating endothelium-dependent vascular relaxation in the coronary microvasculature by transesophageal echocardiography in subjects with angiographically normal coronary arteries. Am J Cardiol 1999; 84:1362-5, A8. [PMID: 10614809 DOI: 10.1016/s0002-9149(99)00576-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Measurement of flow velocity in the left anterior descending coronary artery by transesophageal echocardiography in subjects without risk factors for coronary artery disease (group 1) and in subjects with normal coronary arteries but conditions associated with endothelial dysfunction (group 2) revealed that there was a significantly impaired coronary flow velocity response to the cold pressor test in group 2 subjects. Thus, transesophageal echocardiography provides a minimally invasive tool for the functional assessment of endothelium and can be valuable in evaluating endothelial dysfunction and recovery in a variety of disease states.
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Affiliation(s)
- P A Chandraratna
- Division of Cardiology, Los Angeles County-University of Southern California Medical Center, University of Southern California School of Medicine, 90033, USA
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Mathews SJ. Nothing to fear but fear. Nurs Times 1988; 84:35-7. [PMID: 3405844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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