The paper
Tsung-Han Tsai, Benjamin Potsaid, Martin F. Kraus, Chao Zhou, Yuankai K. Tao, Joachim Hornegger, and James G. Fujimoto
Piezoelectric-transducer-based miniature catheter for ultrahigh-speed endoscopic optical coherence tomography
Biomedical Optics Express 2, 2438-2448 (2011)
has a p...