Abstract

We report on a novel method to produce B-scan images in spectral domain optical coherence tomography (SD-OCT). The method proceeds in two steps. In the first step, using a mirror in the sample arm of the interferometer, channelled spectra are acquired for different values of the optical path difference (OPD) and stored as masks. In the second step, the mirror is replaced with an object and the captured channelled spectrum is correlated with each mask, providing the interference strength from the OPD value used to collect the respective mask. Such a procedure does not require data organized in equal frequency slots, and therefore there is no need for resampling as practiced in the conventional fast Fourier transform (FFT)-based SD-OCT technology. We show that the sensitivity drop-off versus OPD and the quality of B-scan images of the novel method are similar to those obtained in the conventional FFT-based SD-OCT, using spectral data linearly organized in frequency.

© 2014 Optical Society of America

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References

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    [CrossRef]

2013

2012

A. Gh. Podoleanu, J. Microsc. 247, 209 (2012).
[CrossRef]

2007

2005

2004

Akiba, M.

Bajraszewski, T.

Bouma, B.

Bradu, A.

Cense, B.

Chan, K.-P.

Chong, C.

de Boer, J.

Drexler, W.

Fercher, A.

Hermann, B.

Hu, Z.

Itoh, M.

Le, T.

Leitgeb, R.

Madjarova, V. D.

Makita, S.

Morosawa, A.

Mujat, M.

Park, B.

Pierce, M.

Podoleanu, A. Gh.

Rollins, A. M.

Sakai, T.

Stingl, A.

Tearney, G.

Unterhuber, A.

Yasuno, Y.

Yatagai, T.

Yun, S.

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Figures (4)

Fig. 1.
Fig. 1.

Schematic diagram of the Sp-OCT system, memory block, and processing block (Cp, p=1,P¯), showing the signal processing steps to deliver a point in the A-scan for a given mask. DC, directional coupler; L14, achromatic lenses; GX, galvo-scanner; M, flat mirror; TG, diffraction grating; CL, camera link cable; HPF, high-pass filter; IMAQ, image acquisition board; M (OPDp), CS when a mirror replaces the object and OPD=OPDp.

Fig. 2.
Fig. 2.

(a) SNR measured using the conventional FFT-based method and the MSI method, respectively, for different window sizes. (b) Sensitivity drop-off (linear scale) normalized for z=0.22mm for A-scans produced by conventional FFT-based method and by MSI respectively. For the MSI method, a window of size W=5 points was applied to the correlation signal.

Fig. 3.
Fig. 3.

MSI procedure of producing (a) B-scan OCT images made of A-scans and (b) B-scan OCT images made of T-scans. An A-scan Ah is obtained by correlating each CSh with P masks corresponding to different depths. A T-scan Tp is obtained by correlating all CS1H with a mask Mp corresponding to the depth p. The internal structure of C1Cp is shown in Fig. 1.

Fig. 4.
Fig. 4.

B-scan images of an IR card using (a) resampled data FFT-based method and (b) not resampled data-correlation-based MSI method using a window W=30 points.

Equations (2)

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Corrp=FFT1[Rp×FFT(CS)]=FFT1[Rp×U],
Ap(OPD)=k=(w1)k=+(w1)abs(Corrp(k)).

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