Speckle Noise Reduction in Fourier Domain Polarization-Sensitive Coherence Tomography by Split-Spectrum

Yan Chen; Zhongliang Li; Nan Nan; Yang Bu; Xuan Wang; Liuhua Pan; Xiangzhao Wang

doi:10.3788/AOS201838.0811004

Acta Optica Sinica, Volume. 38, Issue 8, 0811004(2018)

Speckle Noise Reduction in Fourier Domain Polarization-Sensitive Coherence Tomography by Split-Spectrum

Yan Chen^1,2、*, Zhongliang Li^1,2, Nan Nan¹, Yang Bu^1,2, Xuan Wang^1,2, Liuhua Pan^1,2, and Xiangzhao Wang^1,2、*

¹ Laboratory of Information Optics and Opto-Electronic Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

² University of Chinese Academy of Sciences, Beijing 100049, China

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Figures & Tables(12)

Fig. 1. Diagram of split-spectrum method for speckle noise reduction

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Fig. 2. Power spectrum of light source

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Fig. 3. Simulation results of intensity images. (a) Before split-spectrum; (b) method 1; (c) method 2

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Fig. 4. Simulation results of the polarization images. Retardation images, (a) before split-spectrum, (c) method 1, (e) method 2; fast axis orientation images, (b) before split-spectrum, (d) method 1, (f) method 2

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Fig. 5. Comparison of A-line signals before and after using the split-spectrum method. (a) Whole result; (b) enlarged view of dashed box in Fig.(a)

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Fig. 6. Schematic of FD-PS-OCT system

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Fig. 7. PS-OCT images of chicken breast muscle. (a)(b) Intensity images before and after using the split-spectrum method; (c)(d) retardation images before and after using the split-spectrum method; (e)(f) fast axis orientation images before and after using the split-spectrum method

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Table 1. Comparison of speckle reduction of 2 methods in intensity images
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Table 1. Comparison of speckle reduction of 2 methods in intensity images
Method Region 1(mean±SD) Region 2(mean±SD)
Beforesplit-spectrum 0.9871±7.2263 1.0296±7.1374
Method1 0.0569±1.1369 0.0333±0.7567
Method2 0.0264±0.5202 0.0104±0.3480

Table 2. Comparison of speckle reduction of two methods in retardation images
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Table 2. Comparison of speckle reduction of two methods in retardation images
Method Region 1 (mean±SD) /rad Region 2 (mean±SD) /rad
Before split-spectrum 0.0191±0.1287 0.0226±0.1457
Method 1 0.0031±0.0535 0.0021±0.0466
Method 2 0.0032±0.0525 0.0011±0.0305

Table 3. Comparison of speckle reduction of two methods in fast axis orientation images
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Table 3. Comparison of speckle reduction of two methods in fast axis orientation images
Method Region 1 (mean±SD) /rad Region 2 (mean±SD) /rad
Before split-spectrum 0.0209±0.1518 0.0225±0.1486
Method 1 0.0015±0.0320 0.0023±0.0453
Method 2 0.0032±0.0535 0.0008±0.0222

Table 4. Comparison of speckle reduction in PS-OCT images before and after split-spectrum method

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Table 4. Comparison of speckle reduction in PS-OCT images before and after split-spectrum method

Method	Intensity (mean±SD)	Retardation(mean±SD) /rad	Fast axis orientation(mean±SD) /rad
Before split-spectrum	129.5587±64.8879	0.4002±0.3156	0.6450±0.5139
Method 2	148.4446±33.4884	0.6437±0.2045	0.7774±0.2732

Table 5. SNR, CNR and ENL for PS-OCT images before and after using split-spectrum method

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Table 5. SNR, CNR and ENL for PS-OCT images before and after using split-spectrum method

Item	Method	SNR /dB	CNR	ENL
R	Before split-spectrum	26.1651	1.0020	2.1539
	Method 2	27.6180	1.7557	7.5866
	Improvement	1.4529	1.7522	3.5223
δ	Before split-spectrum	18.2318	0.7664	1.4162
	Method 2	20.8118	1.4651	5.5352
	Improvement	2.5800	1.9117	3.9085
θ	Before split-spectrum	18.0250	0.7033	1.0144
	Method 2	20.8123	1.3065	3.9362
	Improvement	2.7873	1.8577	3.8803

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Yan Chen, Zhongliang Li, Nan Nan, Yang Bu, Xuan Wang, Liuhua Pan, Xiangzhao Wang. Speckle Noise Reduction in Fourier Domain Polarization-Sensitive Coherence Tomography by Split-Spectrum[J]. Acta Optica Sinica, 2018, 38(8): 0811004

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Paper Information

Category: Imaging Systems

Received: Jan. 25, 2018

Accepted: Apr. 9, 2018

Published Online: Sep. 6, 2018

The Author Email:

DOI:10.3788/AOS201838.0811004

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Comparison of speckle reduction of 2 methods in intensity images

Table 1. Comparison of speckle reduction of 2 methods in intensity images

Table 2. Comparison of speckle reduction of two methods in retardation images

Table 2. Comparison of speckle reduction of two methods in retardation images

Table 3. Comparison of speckle reduction of two methods in fast axis orientation images

Table 3. Comparison of speckle reduction of two methods in fast axis orientation images

Table 4. Comparison of speckle reduction in PS-OCT images before and after split-spectrum method

Table 4. Comparison of speckle reduction in PS-OCT images before and after split-spectrum method

Table 5. SNR, CNR and ENL for PS-OCT images before and after using split-spectrum method

Table 5. SNR, CNR and ENL for PS-OCT images before and after using split-spectrum method