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Journal of Biomedical Optics

Speckle reduction in optical coherence tomography images based on wave atoms
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Paper Abstract

Optical coherence tomography (OCT) is an emerging noninvasive imaging technique, which is based on low-coherence interferometry. OCT images suffer from speckle noise, which reduces image contrast. A shrinkage filter based on wave atoms transform is proposed for speckle reduction in OCT images. Wave atoms transform is a new multiscale geometric analysis tool that offers sparser expansion and better representation for images containing oscillatory patterns and textures than other traditional transforms, such as wavelet and curvelet transforms. Cycle spinning-based technology is introduced to avoid visual artifacts, such as Gibbs-like phenomenon, and to develop a translation invariant wave atoms denoising scheme. The speckle suppression degree in the denoised images is controlled by an adjustable parameter that determines the threshold in the wave atoms domain. The experimental results show that the proposed method can effectively remove the speckle noise and improve the OCT image quality. The signal-to-noise ratio, contrast-to-noise ratio, average equivalent number of looks, and cross-correlation (XCOR) values are obtained, and the results are also compared with the wavelet and curvelet thresholding techniques.

Paper Details

Date Published: 13 May 2014
PDF: 7 pages
J. Biomed. Opt. 19(5) 056009 doi: 10.1117/1.JBO.19.5.056009
Published in: Journal of Biomedical Optics Volume 19, Issue 5
Show Author Affiliations
Yongzhao Du, Beckman Laser Institute and Medical Clinic (United States)
Sichuan Univ. (China)
Gangjun Liu, Beckman Laser Institute and Medical Clinic (United States)
Univ. of California, Irvine (United States)
Guoying Feng, Sichuan Univ. (China)
Zhongping Chen, Beckman Laser Institute and Medical Clinic (United States)
Univ. of California, Irvine (United States)


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