The role of a detector dead time in phase-resolved Doppler analysis using spectral domain optical coherence tomography

Julia Walther; Peter Cimalla; Edmund Koch

doi:10.1117/12.839467

19 February 2010 The role of a detector dead time in phase-resolved Doppler analysis using spectral domain optical coherence tomography

Julia Walther, Peter Cimalla, Edmund Koch

Author Affiliations +

Proceedings Volume 7554, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XIV; 75542B (2010) https://doi.org/10.1117/12.839467
Event: SPIE BiOS, 2010, San Francisco, California, United States

Abstract

We have recently shown that for any oblique sample movement containing a transverse velocity component, the prevalent classic Doppler model assuming that the phase shift is proportional to the axial velocity component is erroneous for spectrometer-based FD OCT. While the previous derivation assumed a continuous integration of the photocurrent, we extend the new Doppler model for detectors with a shutter control by taking the detector dead time into account. Because an analytical solution for the new relation between phase shift and oblique sample displacement can not be given, numerically calculated universal contour plots, which are valid for any center wavelength and beam size, are presented for detector dead times ranging from 5 % to 90 %. Compared to systems with a duty cycle of 100 %, the average phase shift does not approach a constant value for large transverse displacements and high sample velocities. In contrast, at large detector dead times and with this small integration times, the numerically simulated phase shift corresponds almost to the assumed one according to the classic Doppler model for the investigated velocity range. The theoretical results were verified by using a flow phantom model.

Citation Download Citation

Julia Walther, Peter Cimalla, and Edmund Koch "The role of a detector dead time in phase-resolved Doppler analysis using spectral domain optical coherence tomography", Proc. SPIE 7554, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XIV, 75542B (19 February 2010); https://doi.org/10.1117/12.839467

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
6 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Sensors

Phase shifts

Optical coherence tomography

Doppler tomography

Doppler effect

Statistical modeling

Capillaries

Show All Keywords

Keywords/Phrases

Search In:

Publication Years