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Proceedings Paper

Endoscopic optical coherence elastography using acoustic radiation force and bending vibration of optical Fiber
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Paper Abstract

We investigate endoscopic optical coherence elastography with micro-scale resolution using acoustic radiation force. The endoscopic optical scanner has vibration of an optical fiber for scanning the measurement light from an optical coherence tomography (OCT) system to sample tissue. The optical fiber with the length of mechanical resonance condition is vibrated in the bending mode using a cylindrical piezoelectric actuator driven by the phase-shifted voltages, and the output light from the optical fiber end is collimated by a small lens. The prototype of the scanner probe is 1 mm in diameter and 20 mm in length. Stress in the tissue is caused due to acoustic radiation force which is induced by the difference of acoustic energy density at the interface of the propagating media using a focused transducer. The deformation of the tissue sample is measured by the swept source OCT with the depth-scanning rate of 20 kHz and the depth resolution of 9 μm. The displacement and the strain are calculated with the cross-correlation detection using the images before and after applying the force. The strain is slowly relaxed after removal of the force, and the time-varying curve is theoretically modeled. We demonstrated the measurement and the imaging of strain distribution with frame rate of 50 fps.

Paper Details

Date Published: 17 May 2011
PDF: 4 pages
Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77534L (17 May 2011); doi: 10.1117/12.884746
Show Author Affiliations
Ryoichi Isago, Tokyo Institute of Technology (Japan)
Kentaro Nakamura, Tokyo Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 7753:
21st International Conference on Optical Fiber Sensors
Jacques Albert; Wojtek J. Bock, Editor(s)

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