Wavelet analysis on time-frequency plane of optical coherence tomography: simultaneous signal quality improvement in structural and velocity images

Saroch Leedumrongwatthanakun; Panote Thavarungkul; Proespichaya Kanatharana; Chittanon Buranachai

doi:10.1364/OL.43.003730

Optics Letters
Vol. 43,
Issue 15,
pp. 3730-3733
(2018)
•https://doi.org/10.1364/OL.43.003730

Wavelet analysis on time-frequency plane of optical coherence tomography: simultaneous signal quality improvement in structural and velocity images

Saroch Leedumrongwatthanakun, Panote Thavarungkul, Proespichaya Kanatharana, and Chittanon Buranachai

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Saroch Leedumrongwatthanakun, Panote Thavarungkul, Proespichaya Kanatharana, and Chittanon Buranachai, "Wavelet analysis on time-frequency plane of optical coherence tomography: simultaneous signal quality improvement in structural and velocity images," Opt. Lett. 43, 3730-3733 (2018)

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Abstract

In this Letter, we utilize one-dimensional wavelet analysis to improve the quality of morphology images and velocity profiles of optical coherence tomography simultaneously, by performing analysis on the complex time-frequency plane of raw interferograms, prior to image construction. The results indicate a robust signal improvement that also preserves accuracy for both morphology and velocity information and has been demonstrated on a variety of samples with diverse flow speeds and morphologies.

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Image	SNR (dB)	CNR (dB)	$β$	ENL
Original	45.87	5.99	N/A	$2830 \pm 488$
Improved	Inf	14.44	0.3371	$148.8 \pm 139.2$

Image	$\bar{v}$ (mm/s)	$d$ (mm)	$R_{16 mm / s}^{2}$	$R_{fit}^{2}$
Original	9.21	0.984	−2.52	0.78
Improved	14.23	1.035	0.81	0.90

Image	SNR (dB)	CNR (dB)	$β$	ENL
Original	45.87	5.99	N/A	$2830 \pm 488$
Improved	Inf	14.44	0.3371	$148.8 \pm 139.2$

Image	$\bar{v}$ (mm/s)	$d$ (mm)	$R_{16 mm / s}^{2}$	$R_{fit}^{2}$
Original	9.21	0.984	−2.52	0.78
Improved	14.23	1.035	0.81	0.90

Saroch Leedumrongwatthanakun	https://orcid.org/0000-0002-9915-4207
Panote Thavarungkul	https://orcid.org/0000-0002-6096-6371
Proespichaya Kanatharana	https://orcid.org/0000-0003-2501-0216
Chittanon Buranachai	https://orcid.org/0000-0001-7077-0260

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Optics Letters