1. Articles from Hanhua Feng

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    1. Feature Of The Week 4/22/12: Novel MEMs-Driven OCT Endoscopic Imaging Probe Investigated by Singapore Researchers

      Feature Of The Week 4/22/12: Novel MEMs-Driven OCT Endoscopic Imaging Probe Investigated by Singapore Researchers

      Optical coherence tomography (OCT) has demonstrated its potential as a powerful imaging technology due to its cellular or even subcellular resolution (1-10 μm), which is considered suitable for early detection and diagnosis of cancer. For some clinic applications, for example, intravascular or gastrointestinal investigation, full circumferential scanning (FCS) is highly desired. Early research efforts on FCS such as spinning the entire catheter with build-in cables and fibers were capable of scanning at limited speeds with nonlinear motion due to the long cable rotation. Commercially-available micromotors have also been employed to spin mirrors or prisms to achieve FCS. In recent years ...

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    2. Compact MEMS-driven pyramidal polygon reflector for circumferential scanned endoscopic imaging probe

      Compact MEMS-driven pyramidal polygon reflector for circumferential scanned endoscopic imaging probe

      A novel prototype of an electrothermal chevron-beam actuator based micro-electromechanical systems (MEMS) platform has been successfully developed for circumferential scan. Microassembly technology is utilized to construct this platform, which consists of a MEMS chevron-beam type microactuator and a micro-reflector. The proposed electrothermal microactuators with a two-stage electrothermal cascaded chevron-beam driving mechanism provide displacement amplification, thus enabling a highly reflective micro-pyramidal polygon reflector to rotate a large angle for light beam scanning. This MEMS platform is ultra-compact, supports circumferential imaging capability and is suitable for endoscopic optical coherence tomography (EOCT) applications, for example, for intravascular cancer detection.

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    3. Microfabricated endoscopic probe integrated MEMS micromirror for optical coherence tomography bioimaging

      Microfabricated endoscopic probe integrated MEMS micromirror for optical coherence tomography bioimaging
      In this paper, we present a miniaturized endoscopic probe, consisted of MEMS micromirror, silicon optical bench (SiOB), grade index (GRIN) lens, single mode optical fiber (SMF) and transparent housing, for optical coherence tomography (OCT) bioimaging. Due to the use of the MEMS micromirror, the endoscopic OCT system is highly suitable for non-invasive imaging diagnosis of a wide variety of inner organs. The probe engineering and proof of concept were demonstrated by obtaining the two-dimensional OCT images with a cover slide and an onion used as standard samples and the axial resolution was around 10µm.
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    1-3 of 3
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    1. (2 articles) National University of Singapore
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