Textural Feature Analysis of Optical Coherence Tomography Phantoms

Kulmaganbetov M. Bevan R.J. Anantrasirichai N. Achim A. Erchova I. White N. Albon J. Morgan J.E.
February-2 2022 MDPI

Electronics (Switzerland)
2022 #11 Issue 4

Optical coherence tomography (OCT) is an imaging technique based on interferometry of backscattered lights from materials and biological samples. For the quantitative evaluation of an OCT system, artificial optical samples or phantoms are commonly used. They mimic the structure of biological tissues and can provide a quality standard for comparison within and across devices. Phantoms contain medium matrix and scattering particles within the dimension range of target biological structures such as the retina. The aim was to determine if changes in speckle derived optical texture could be employed to classify the OCT phantoms based on their structural composition. Four groups of phantom types were prepared and imaged. These comprise different concentrations of a medium matrix (gelatin solution), different sized polystyrene beads (PBs), the volume of PBs and different refractive indices of scatterers (PBs and SiO₂). Texture analysis was applied to detect subtle optical differences in OCT image intensity, surface coarseness and brightness of regions of interest. A semi-automated classifier based on principal component analysis (PCA) and support vector machine (SVM) was applied to discriminate the various texture models. The classifier detected correctly different phantom textures from 82% to 100%, demonstrating that analysis of the texture of OCT images can be potentially used to discriminate biological structure based on subtle changes in light scattering.

Optical coherence tomography , Phantoms , Principal component analysis , Support vector machine , Texture analysis

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School of Optometry and Vision Sciences, Cardiff University, Cardiff, CF24 4HQ, United Kingdom
Kazakh Eye Research Institute, Almaty, A05H2A8, Kazakhstan
UK Dementia Research Institute, Cardiff University, Cardiff, CF24 4HQ, United Kingdom
Visual Information Laboratory, University of Bristol, Bristol, BS8 1TH, United Kingdom

School of Optometry and Vision Sciences
Kazakh Eye Research Institute
UK Dementia Research Institute
Visual Information Laboratory

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