Fiber-delivered Acoustic 3D Imaging System with Laser-induced Breakdown

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  • Yasumuro Yoshihiro
    Graduate School of Information Science, Nara Institute of Science and Technology
  • Sugiura Tadao
    Graduate School of Information Science, Nara Institute of Science and Technology
  • Oshiro Osamu
    Graduate School of Engineering Science, Osaka University
  • Chihara Kunihiro
    Graduate School of Information Science, Nara Institute of Science and Technology

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  • ３次元音響イメージングのための光ファイバによるレーザブレークダウン音源システム
  • 3ジゲン オンキョウ イメージング ノ タメノ ヒカリ ファイバ ニ ヨル レーザ ブレークダウン オンゲン システム

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Abstract

This paper describes a fabrication scheme for integrating an optical fiber-delivered catheter for ultrasound (US) imaging. In this catheter, pulsed laser is focused and guided into a tapered optical fiber. The laser passes through the fiber and is refocused to generate laser-induced breakdown (LIB), which emits spherical pulsed US wave. The reflected US waves are received with a hydrophone array to reconstruct 3D images with synthetic aperture method. We examined the probability of LIB generation relative to pulsed energy level for stably producing US pulses and clarified a suitable specification for a laser delivering fiber. Proto-type catheter demonstrated real-time 3D imaging, in which LIB is continuously generated on the tip of the catheter and frontal situation is captured in 3D images in realtime process.

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