1 / 10

Frequency Domain Optical Coherence Tomography (FDOCT)

Frequency Domain Optical Coherence Tomography (FDOCT). Joon S Kim IMSURE Summer Research Fellow At Beckman Laser Institute University of California at Irvine Irvine, CA 92612 Email: jkim627@mail.umd.edu. OCT. Optical Coherence Tomography

rfujiwara
Download Presentation

Frequency Domain Optical Coherence Tomography (FDOCT)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Frequency Domain Optical Coherence Tomography (FDOCT) Joon S Kim IMSURE Summer Research Fellow At Beckman Laser Institute University of California at Irvine Irvine, CA 92612 Email: jkim627@mail.umd.edu

  2. OCT • Optical Coherence Tomography • New field of imaging technology that can complement conventional imaging techniques • Based on interference of EM wave • Provide high spatial resolution cross-sectional view of tissues without excision • Endless potential biomedical applications • Non-invasive Diagnostics

  3. Resolution (log) 1 mm Ultrasound 100 mm 10 mm Confocalmicroscopy 1 mm Penetration depth (log) 1 mm 1 cm 10 cm OCT vs. Conventional Imag. Tech Standardclinical Highfrequency OCT

  4. Two kinds of OCT • TDOCT • Time Domain OCT • Use of Scanning Mirror • FDOCT • Fourier (Frequency) Domain OCT • Use of laser source over band of optical frequency • Advantages over TDOCT

  5. My research experience with FDOCT are in 2 phases… • First phase: • Understanding and Replicating FDOCT experimental setting from scratch • Second phase: • Learning the physical and mathematical reasoning behind the magical DSP algorithm which extract images out of OCT data!

  6. Part 1 Swept source Mirror • FDOCT experiment set up Grating Collimator 2 x 2 Coupler Phase Modulator Attenuator Fiber Fabry-Perot interferometer Probe Detector1 Sample Detector2

  7. Current FDOCT System • No human intervention required • Everything controlled from execution module in host computer • Host computer • houses NI-6112: A2D Conversion of OCT data • performs digital signal processing • controls peripherals

  8. Scanning sample • Surface of sample is divided into imaginary grid. • Each block in grid: Pixel • Scanning in X direction • Lateral scan • Scanning in Z direction • A scan Z Y X

  9. Scanning sample (cont.) • 1600 samples / A-scan (pixel) • 400 A-scan / Lateral scan • Lateral scanning Frequency: 2 KHz • A-scanning Frequency: 10 MHz • Limited by A2D converter (NI-6112) • Pixel size: 10 micron • Slow process => not applicable in Vivo

  10. With NI-5122 • Max. Sampling Frequency: 100 MS/sec • A-scanning Frequency: 100 MHz • More time for DSP • Boost lateral scanning frequency to 20 KHz • One step closer to in Vivo application of FDOCT

More Related