New model for space encoded Fourier domain optical Doppler tomography

Edmund Koch; Julia Walther; Maximiliano Cuevas

doi:10.1117/12.809120

20 February 2009 New model for space encoded Fourier domain optical Doppler tomography

Edmund Koch, Julia Walther, Maximiliano Cuevas

Proceedings Volume 7168, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XIII; 71681Q (2009) https://doi.org/10.1117/12.809120
Event: SPIE BiOS, 2009, San Jose, California, United States

Abstract

Spectrometer-based or space encoded Fourier domain OCT is preferred because of its relatively simple design, fast measurement speed and good signal-to-noise ratio. Besides delivering structural information, it is often used to measure blood flow velocities. Commonly, the axial component of the velocity is calculated from the phase difference of consecutive A-Scans. While this result holds true for pure axial movement, a transversal component of the displacement will alter this simple relationship. We present a new model accounting for the changing intensity of the illuminating beam on the moving particles and explaining why the phase difference does not increase linearly with the velocity. Movements as small as 20 % of the beam diameter during the integration time of the line detector will alter the observed phase shifts noticeably. For small angles between transversal direction and direction of movement, the discrepancy between classically calculated and measured phase shift may be huge. At certain velocities and angles no correlation of the phase exists even so there is an OCT-signal. High velocities at small angles will result in a limit for the phase shift smaller than π. A safe region, where the deviations to the linear relationship between axial velocity and phase shift are small, is specified.

Citation Download Citation

Edmund Koch, Julia Walther, and Maximiliano Cuevas "New model for space encoded Fourier domain optical Doppler tomography", Proc. SPIE 7168, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XIII, 71681Q (20 February 2009); https://doi.org/10.1117/12.809120

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
11 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Phase shifts

Optical coherence tomography

Sensors

Capillaries

Spectroscopy

Doppler tomography

Phase measurement

Show All Keywords

Keywords/Phrases

Search In:

Publication Years