title: Compact piezoelectric transducer fiber scanning probe for optical coherence tomography.
abstract: We developed a compact, optical fiber scanning piezoelectric transducer (PZT) probe for endoscopic and minimally invasive optical coherence tomography (OCT). Compared with previous forward-mount fiber designs, we present a reverse-mount design that achieves a shorter rigid length. The fiber was mounted at the proximal end of a quadruple PZT tube and scanned inside the hollow PZT tube to reduce the probe length. The fiber resonant frequency was 338 Hz using a 17-mm-long fiber. A 0.9 mm fiber deflection was achieved with a driving amplitude of 35 V. Using a GRIN lens-based optical design with a 1.3× magnification, a ∼6 μm spot was scanned over a 1.2 mm diameter field. The probe was encased in a metal hypodermic tube with a ∼25 mm rigid length and covered with a 3.2 mm outer diameter (OD) plastic sheath. Imaging was performed with a swept source OCT system based on a Fourier domain modelocked laser (FDML) light source at a 240 kHz axial scan rate and 8 μm axial resolution (in air). En face OCT imaging of skin in vivo and human colon ex vivo was demonstrated.
authors.forename: Ning
authors.initials: N
authors.lastname: Zhang
authors.forename: Tsung-Han
authors.initials: TH
authors.lastname: Tsai
authors.forename: Osman O
authors.initials: OO
authors.lastname: Ahsen
authors.forename: Kaicheng
authors.initials: K
authors.lastname: Liang
authors.forename: Hsiang-Chieh
authors.initials: HC
authors.lastname: Lee
authors.forename: Ping
authors.initials: P
authors.lastname: Xue
authors.forename: Xingde
authors.initials: X
authors.lastname: Li
authors.forename: James G
authors.initials: JG
authors.lastname: Fujimoto
mesh_terms: D003106:Colon; D004867:Equipment Design; D006801:Humans; D055100:Optical Fibers; D041623:Tomography, Optical Coherence / Q000295:instrumentation*; D014159:Transducers