Journal
LIGHT-SCIENCE & APPLICATIONS
Volume 6, Issue -, Pages -Publisher
CHINESE ACAD SCIENCES, CHANGCHUN INST OPTICS FINE MECHANICS AND PHYSICS
DOI: 10.1038/lsa.2017.103
Keywords
cardiac; medical devices; optoacoustic; photoacoustic; ultrasound
Categories
Funding
- European Research Council (ERC-StG) [310970 MOPHIM]
- Wellcome Trust [WT101957]
- Engineering and Physical Sciences Research Council (EPSRC) [NS/A000027/1]
- EPSRC
- European Union project FAMOS (FCT) [317744]
- National Institute for Health Research University College London Hospitals Biomedical Research Centre
- National Institute for Health Research Barts
- London Biomedical Research Unit
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High-frequency ultrasound imaging can provide exquisite visualizations of tissue to guide minimally invasive procedures. Here, we demonstrate that an all-optical ultrasound transducer, through which light guided by optical fibers is used to generate and receive ultrasound, is suitable for real-time invasive medical imaging in vivo. Broad-bandwidth ultrasound generation was achieved through the photoacoustic excitation of a multiwalled carbon nanotube-polydimethylsiloxane composite coating on the distal end of a 300-mu m multi-mode optical fiber by a pulsed laser. The interrogation of a high-finesse Fabry-Perot cavity on a single-mode optical fiber by a wavelength-tunable continuous-wave laser was applied for ultrasound reception. This transducer was integrated within a custom inner transseptal needle (diameter 1.08 mm; length 78 cm) that included a metallic septum to acoustically isolate the two optical fibers. The use of this needle within the beating heart of a pig provided unprecedented real-time views (50 Hz scan rate) of cardiac tissue (depth: 2.5 cm; axial resolution: 64 mu m) and revealed the critical anatomical structures required to safely perform a transseptal crossing: the right and left atrial walls, the right atrial appendage, and the limbus fossae ovalis. This new paradigm will allow ultrasound imaging to be integrated into a broad range of minimally invasive devices in different clinical contexts.
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