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A reconfigurable all-optical ultrasound transducer array for 3D endoscopic imaging

Authors :
Erwin J, Alles
Nora, Fook Sheung
Sacha, Noimark
Edward Z, Zhang
Paul C, Beard
Adrien E, Desjardins
Source :
Scientific Reports
Publication Year :
2016

Abstract

A miniature all-optical ultrasound imaging system is presented that generates three-dimensional images using a stationary, real acoustic source aperture. Discrete acoustic sources were sequentially addressed by scanning a focussed optical beam across the proximal end of a coherent fibre bundle; high-frequency ultrasound (156% fractional bandwidth centred around 13.5 MHz) was generated photoacoustically in the corresponding regions of an optically absorbing coating deposited at the distal end. Paired with a single fibre-optic ultrasound detector, the imaging probe (3.5 mm outer diameter) achieved high on-axis resolutions of 97 μm, 179 μm and 110 μm in the x, y and z directions, respectively. Furthermore, the optical scan pattern, and thus the acoustic source array geometry, was readily reconfigured. Implementing four different array geometries revealed a strong dependency of the image quality on the source location pattern. Thus, by employing optical technology, a miniature ultrasound probe was fabricated that allows for arbitrary source array geometries, which is suitable for three-dimensional endoscopic and laparoscopic imaging, as was demonstrated on ex vivo porcine cardiac tissue.

Details

ISSN :
20452322
Volume :
7
Issue :
1
Database :
OpenAIRE
Journal :
Scientific reports
Accession number :
edsair.pmid..........c7b153a69264c2e5542156d47dd283b8