Speckle Reduction in 3D Optical Coherence Tomography of Retina by A-Scan Reconstruction

Jun Cheng, Dacheng Tao, Ying Quan, Damon Wing Kee Wong, Gemmy Chui Ming Cheung, Masahiro Akiba, Jiang Liu

Research output: Journal PublicationArticlepeer-review

48 Citations (Scopus)

Abstract

Optical coherence tomography (OCT) is a micrometer-scale, cross-sectional imaging modality for biological tissue. It has been widely used for retinal imaging in ophthalmology. Speckle noise is problematic in OCT. A raw OCT image/volume usually has very poor image quality due to speckle noise, which often obscures the retinal structures. Overlapping scan is often used for speckle reduction in a 2D line-scan. However, it leads to an increase of the data acquisition time. Therefore, it is unpractical in 3D scan as it requires a much longer data acquisition time. In this paper, we propose a new method for speckle reduction in 3D OCT. The proposed method models each A-scan as the sum of underlying clean A-scan and noise. Based on the assumption that neighboring A-scans are highly similar in the retina, the method reconstructs each A-scan from its neighboring scans. In the method, the neighboring A-scans are aligned/registered to the A-scan to be reconstructed and form a matrix together. Then low rank matrix completion using bilateral random projection is utilized to iteratively estimate the noise and recover the underlying clean A-scan. The proposed method is evaluated through the mean square error, peak signal to noise ratio and the mean structure similarity index using high quality line-scan images as reference. Experimental results show that the proposed method performs better than other methods. In addition, the subsequent retinal layer segmentation also shows that the proposed method makes the automatic retinal layer segmentation more accurate. The technology can be embedded into current OCT machines to enhance the image quality for visualization and subsequent analysis such as retinal layer segmentation.

Original languageEnglish
Article number7457249
Pages (from-to)2270-2279
Number of pages10
JournalIEEE Transactions on Medical Imaging
Volume35
Issue number10
DOIs
Publication statusPublished - Oct 2016
Externally publishedYes

Keywords

  • Matrix completion
  • optical coherence tomography
  • speckle reduction

ASJC Scopus subject areas

  • Software
  • Radiological and Ultrasound Technology
  • Computer Science Applications
  • Electrical and Electronic Engineering

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