title: Piezoelectric-transducer-based miniature catheter for ultrahigh-speed endoscopic optical coherence tomography.
abstract: We developed a piezoelectric-transducer- (PZT) based miniature catheter with an outer diameter of 3.5 mm for ultrahigh-speed endoscopic optical coherence tomography (OCT). A miniaturized PZT bender actuates a fiber and the beam is scanned through a GRIN lens and micro-prism to provide high-speed, side-viewing capability. The probe optics can be pulled back over a long distance to acquire three-dimensional (3D) data sets covering a large area. Imaging is performed with 11 μm axial resolution in air (8 μm in tissue) and 20 μm transverse resolution, at 960 frames per second with a Fourier domain mode-locked laser operating at 480 kHz axial scan rate. Using a high-speed data acquisition system, endoscopic OCT imaging of the rabbit esophagus and colon in vivo and human colon specimens ex vivo is demonstrated.
authors.forename: Tsung-Han
authors.initials: TH
authors.lastname: Tsai
authors.forename: Benjamin
authors.initials: B
authors.lastname: Potsaid
authors.forename: Martin F
authors.initials: MF
authors.lastname: Kraus
authors.forename: Chao
authors.initials: C
authors.lastname: Zhou
authors.forename: Yuankai K
authors.initials: YK
authors.lastname: Tao
authors.forename: Joachim
authors.initials: J
authors.lastname: Hornegger
authors.forename: James G
authors.initials: JG
authors.lastname: Fujimoto