Download or read book Wavefront Sensorless Adaptive Optics Swept Source Optical Coherence Tomography at 1060nm written by Sujin Tom Lee and published by . This book was released on 2015 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical Coherence Tomography (OCT) has revolutionized modern ophthalmology, providing depth resolved images of the retinal layers in a system that is suited to a clinical environment. A limitation on the performance and utilization of the OCT systems has been the lateral resolution; whereas the axial resolution is a function of the light source, the lateral resolution is dependent on the delivery optics. In this thesis, a compact lens based OCT system is presented that is capable of imaging the different retinal layers at a cellular lateral resolution with the combination of wavefront sensorless adaptive optics with dual variable optical elements. The central operating imaging wavelength of the wavelength swept OCT engine was 1060nm, close to the dispersion minimum of water (and the vitreous humor in the eye). A commercially available variable focal length lens is utilized to correct for a wide range of defocus commonly found in patient's eyes, and a multi-actuator deformable lens for aberration correction to obtain near diffraction limited imaging at the retina. A parallel processing computational platform permitted real-time image acquisition and display. Cross-sectional images of the retinal layers and en face images of the cone photoreceptor mosaic acquired in vivo from research subjects are presented.
Download or read book Handbook of Adaptive Optics written by Enrique Josua Fernandez and published by CRC Press. This book was released on 2024-09-02 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adaptive Optics (AO) is a technique allowing the manipulation of the wavefront of the light benefitting multiple fields like Microscopy, Optical Coherence Tomography, Visual Testing, Optical Communications, and Astronomical Optics, just to mention some examples. Handbook of Adaptive Optics contains a complete picture of the technique from the foundations to the most promising applications of AO in a variety of fields. Within this book, the reader will find different sections, including: a complete and rigorous introduction to the foundation of the technique from a general perspective, providing the reader a solid basis in AO with particular emphasis on wavefront sensing methods and aberration correctors. It also discusses state-of-the-art applications and industrial usages with their particular constraints and methods to incorporate AO, like in some imaging techniques of importance for Biomedical Optics, in Astronomy and for Visual Optics. Furthermore, it explores discussions of the future of AO together with some of the most exciting emerging applications, including quantum technologies, scattering correction, space telescopes, and discrete AO, among others. This timely handbook will be an important companion to those starting in the field, but it will also serve as a comprehensive resource for researchers and experts who are already working with AO.
Download or read book Full Range Swept Source Optical Coherence Tomography with Ultra Small Fiber Probes for Biomedical Imaging written by Youxin Mao and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Full Range Swept-Source Optical Coherence Tomography with Ultra Small Fiber Probes for Biomedical Imaging.
Download or read book Development of Phase Stabilized Swept Source Optical Coherence Tomography for Biomedical Imaging and Sensing written by Ravi Kiran Manapuram and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wavefront Sensorless Adaptive Optics in Temporal Focusing Multiphoton Microscopy and Real time FPGA Adaptive Optics System written by and published by . This book was released on 2014 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Swept Source Optical Coherence Tomography System Development for Bioimaging Applications written by Luoqin Yu and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Full Field Swept Source Optical Coherence Tomography written by James Fergusson and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical Coherence Tomography (OCT) is a non-invasive volumetric imaging technique that offers micron scale resolution over several millimetres of depth penetration in tissue. The aim of the project was to develop Full Field Swept Source OCT (FFSSOCT), charting the specifications of the system throughout and drawing comparisons with available Fourier domain OCT (FDOCT) systems. A super luminescent diode (SLD) light source was tuned to different optical frequencies using an acousto-optical tunable filter. The successive optical frequencies were distributed across the sample in parallel and the sequential interference spectra were recorded with a high speed digital camera. Using a 5mW optical source at 850nm, 70dB sensitivity was ultimately achieved in a single five second acquisition, improving the original performance by 5dB and increasing acquisition and processing time significantly. Ex vivo retinal images of rat and tree shrew were recorded with multiple layers visible. All software was custom written in Labview, improving the user interface and processing time over the existing Matlab code. To enhance the performance of the system, the camera was subsequently upgraded from 15 to 45% quantum efficiency and from 250k to 1.3M pixels. The light source was also upgraded to 20mW. The software was improved with spectral processing and dispersion compensation. 85dB sensitivity was ultimately achieved. Further ex vivo retinal images were taken, showing comparative image quality to those of the same retinal samples recorded with FDOCT. Further attempts to increase the system performance were limited by internal reflections and interfering surfaces within the FFSSOCT design leading to saturation of the digital camera. In vivo imaging was attempted using software based phase jitter compensation. Improvement could be seen with simple reflecting structures.
Download or read book Dynamic Range Enhancement in Swept Source Optical Coherence Tomography written by Jun Zhang and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The imaging penetration depth of an optical coherence tomography (OCT) system is limited by the dynamic range of the system. In a common case that signals exceed the dynamic range of a Fourier domain OCT (FDOCT) system, saturation artifacts degrade the image quality. In this chapter, we demonstrate some new cost-effective techniques to improve the dynamic range of a swept-source OCT (SSOCT) system. For example, one method is based on a dual-channel detection technique to enhance the dynamic range by reconstructing the saturated signals due to strong reflection of the sample surface. Another method utilizes a tunable high-pass filter to compensate the attenuation of light signal in deep tissue. It was demonstrated that these techniques can improve the dynamic range of an SSOCT system by more than 10 dB with a low bit-depth analog-to-digital converter.
Download or read book High speed Phase stable Swept Source Optical Coherence Tomography written by Yuye Ling and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We thus came up with an idea of applying the compressive sensing (CS) to reduce the data size. Currently, we have demonstrated some preliminary results with using CS on reference k-clock channel compression. In the future, we will apply the same theory to compress the sample channel data, especially or time lapse OCT imaging.
Download or read book A Study of the Application of Adaptive Optics AO in Optical Coherence Tomography OCT and Confocal Microscopy for the Purpose of High Resolution Imaging written by Christopher Costa and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Swept Source Optical Coherence Tomography System Development for Bioimaging Applications written by 俞罗琴 and published by . This book was released on 2015 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Optical Coherence Tomography for Polarization sensitive Imaging Aberration Correction and Wavefront Measurement written by Fredrick A. South and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chip Based Common path Swept source Optical Coherence Tomography Device written by Lantian Chang and published by . This book was released on 2016 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photon Migration Diffuse Spectroscopy and Optical Coherence Tomography written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine X written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical coherence tomography written by Wolfgang Drexler and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
