A high speed (47,000 A-scan/s), high resoluiton FD-OCT system, operating in the 1060nm wavelength range was used to acquire in-vivo 3D image of healthy and pathological rat retinas. The images were acquired with ~4.3µm axial and ~5µm lateral resolution in the rat eye and 102dB sensitivity at 1.3mW optical power of the imaging beam. The images of the healthy rat retinas show increased penetration into the choroid, clear visualization of all intra-retinal layers and the choroidal blood network, as well as part of the underlying sclera. The high imaging resolution of the OCT system is also sufficient for resolving tiny capillaries imbedded in the inner - and outer plexiform layers of the retina. The high data acquisition rate of the FD-OCT system combined with the high axial resolution is also suitable for probing light induced physiological processes in the retina simultaneously with the morphological imaging.
This paper introduces a speckle reduction technique for Optical Coherence Tomography (OCT) images based on soft thresholding the wavelet coefficients using interval type II fuzzy system. The proposed method is an extension of a recently published method for additive noise using type I fuzzy system. It has been shown that the new method outperforms the traditional Wiener and modified Lee algorithms in terms of image metrics. Unlike the type I, interval type II fuzzy based thresholding filter considers the uncertainty in the calculated threshold and the wavelet coefficient is adjusted based on this uncertainty. Application of this novel algorithm to an optical coherence tomography image acquired in-vivo from a human finger tip shows reduction in speckle noise with little edge blurring and image SNR improvement of ~10dB.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.