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Klufts M, Jiménez AM, Lotz S, Bashir MA, Pfeiffer T, Mlynek A, Wieser W, Chamorovskiy A, Bradu A, Podoleanu A, Huber R. 828 kHz retinal imaging with an 840 nm Fourier domain mode locked laser. BIOMEDICAL OPTICS EXPRESS 2023; 14:6493-6508. [PMID: 38420314 PMCID: PMC10898573 DOI: 10.1364/boe.504302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 11/08/2023] [Accepted: 11/16/2023] [Indexed: 03/02/2024]
Abstract
This paper presents a Fourier domain mode locked (FDML) laser centered around 840 nm. It features a bidirectional sweep repetition rate of 828 kHz and a spectral bandwidth of 40 nm. An axial resolution of ∼9.9 µm in water and a 1.4 cm sensitivity roll-off are achieved. Utilizing a complex master-slave (CMS) recalibration method and due to a sufficiently high sensitivity of 84.6 dB, retinal layers of the human eye in-vivo can be resolved during optical coherence tomography (OCT) examination. The developed FDML laser enables acquisition rates of 3D-volumes with a size of 200 × 100 × 256 voxels in under 100 milliseconds. Detailed information on the FDML implementation, its challenging design tasks, and OCT images obtained with the laser are presented in this paper.
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Affiliation(s)
- Marie Klufts
- Institute of Biomedical Optics, University of Lübeck, Lübeck 23562, Germany
| | | | - Simon Lotz
- Institute of Biomedical Optics, University of Lübeck, Lübeck 23562, Germany
| | | | | | | | | | | | - Adrian Bradu
- School of Physical Sciences, University of Kent, Canterbury CT2 7NH, United Kingdom
| | - Adrian Podoleanu
- School of Physical Sciences, University of Kent, Canterbury CT2 7NH, United Kingdom
| | - Robert Huber
- Institute of Biomedical Optics, University of Lübeck, Lübeck 23562, Germany
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Xie R, Qiu B, Chhablani J, Zhang X. Evaluation of Choroidal Thickness Using Optical Coherent Tomography: A Review. Front Med (Lausanne) 2021; 8:783519. [PMID: 34926529 PMCID: PMC8677938 DOI: 10.3389/fmed.2021.783519] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Accepted: 10/18/2021] [Indexed: 12/21/2022] Open
Abstract
The choroid is the main source of blood and nourishment supply to the eye. The dysfunction of the choroid has been implicated in various retinal and choroidal diseases. The identification and in-depth understanding of pachychoroid spectrum disorders are based on the tremendous progress of optical coherence tomography (OCT) technology in recent years, although visibility of choroid is challenging in the era of the time or spectral domain OCT. The recent rapid revolution of OCTs, such as the enhanced depth imaging OCT and the swept-source OCT, has greatly contributed to the significant improvement in the analysis of the morphology and physiology of the choroid precisely, especially to the choroid-scleral boundary and vasculature. The present review highlights the recently available evidence on the measurement methodology and the clinical significance of choroidal thickness in retinal or choroidal disorders.
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Affiliation(s)
- Rui Xie
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Retinal and Choroidal Vascular Diseases Study Group, Beijing, China
| | - Bingjie Qiu
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Retinal and Choroidal Vascular Diseases Study Group, Beijing, China
| | - Jay Chhablani
- The University of Pittsburgh Medical Center Eye Center, University of Pittsburgh, Pittsburgh, PA, United States
| | - Xinyuan Zhang
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Retinal and Choroidal Vascular Diseases Study Group, Beijing, China
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McNabb RP, Polans J, Keller B, Jackson-Atogi M, James CL, Vann RR, Izatt JA, Kuo AN. Wide-field whole eye OCT system with demonstration of quantitative retinal curvature estimation. BIOMEDICAL OPTICS EXPRESS 2019; 10:338-355. [PMID: 30775104 PMCID: PMC6363197 DOI: 10.1364/boe.10.000338] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 12/07/2018] [Accepted: 12/08/2018] [Indexed: 05/06/2023]
Abstract
Current conventional clinical OCT systems image either only the anterior or the posterior eye during a single acquisition. This localized imaging limits conventional OCT's use for characterizing global ocular morphometry and biometry, which requires knowledge of spatial relationships across the entire eye. We developed a "whole eye" optical coherence tomography system that simultaneously acquires volumes with a wide field-of-view for both the anterior chamber (14 x 14 mm) and retina (55°) using a single source and detector. This system was used to measure retinal curvature in a pilot population and compared against curvature of the same eyes measured with magnetic resonance imaging.
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Affiliation(s)
- Ryan P. McNabb
- Department of Ophthalmology, Duke University Medical Center, 2351 Erwin Road, Durham, NC 27710, USA
| | - James Polans
- Department of Biomedical Engineering, Duke University, 101 Science Drive, Durham, NC, 27708, USA
| | - Brenton Keller
- Department of Biomedical Engineering, Duke University, 101 Science Drive, Durham, NC, 27708, USA
| | - Moseph Jackson-Atogi
- Department of Ophthalmology, Duke University Medical Center, 2351 Erwin Road, Durham, NC 27710, USA
| | - Charlene L. James
- Department of Ophthalmology, Duke University Medical Center, 2351 Erwin Road, Durham, NC 27710, USA
| | - Robin R. Vann
- Department of Ophthalmology, Duke University Medical Center, 2351 Erwin Road, Durham, NC 27710, USA
| | - Joseph A. Izatt
- Department of Ophthalmology, Duke University Medical Center, 2351 Erwin Road, Durham, NC 27710, USA
- Department of Biomedical Engineering, Duke University, 101 Science Drive, Durham, NC, 27708, USA
| | - Anthony N. Kuo
- Department of Ophthalmology, Duke University Medical Center, 2351 Erwin Road, Durham, NC 27710, USA
- Department of Biomedical Engineering, Duke University, 101 Science Drive, Durham, NC, 27708, USA
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Kawagoe H, Yamanaka M, Nishizawa N. Axial resolution and signal-to-noise ratio in deep-tissue imaging with 1.7-μm high-resolution optical coherence tomography with an ultrabroadband laser source. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:85002. [PMID: 28777837 DOI: 10.1117/1.jbo.22.8.085002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2017] [Accepted: 07/14/2017] [Indexed: 06/07/2023]
Abstract
We investigated the axial resolution and signal-to-noise ratio (SNR) characteristics in deep-tissue imaging by 1.7-μm optical coherence tomography (OCT) with the axial resolution of 4.3 μm in tissue. Because 1.7-μm OCT requires a light source with a spectral width of more than 300 nm full-width at half maximum to achieve such high resolution, the axial resolution in the tissue might be degraded by spectral distortion and chromatic dispersion mismatching between the sample and reference arms. In addition, degradation of the axial resolution would also lead to reduced SNR. Here, we quantitatively evaluated the degradation of the axial resolution and the resulting decrease in SNR by measuring interference signals through a lipid mixture serving as a turbid tissue phantom with large scattering and absorption coefficients. Although the axial resolution was reduced by a factor of ∼6 after passing through a 2-mm-thick tissue phantom, our result clearly showed that compensation of the dispersion mismatching allowed us to achieve an axial resolution of 4.3 μm in tissue and improve the SNR by ∼5 dB compared with the case where dispersion mismatching was not compensated. This improvement was also confirmed in the observation of a hamster’s cheek pouch in a buffer solution.
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Affiliation(s)
- Hiroyuki Kawagoe
- , Department of Quantum Engineering, Furo-cho, Chikusa-ku, Nagoya, Aichi
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Suzuki M, Ganeev RA, Yoneya S, Kuroda H. Generation of broadband noise-like pulse from Yb-doped fiber laser ring cavity. OPTICS LETTERS 2015; 40:804-807. [PMID: 25723437 DOI: 10.1364/ol.40.000804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We have demonstrated a generation of the noise-like pulse (NLP) with broadband spectrum in a nonlinear polarized evolution-based passive mode-locked Yb-doped fiber (YDF) ring laser. At the cavity dispersion of near zero, the NLP with spectrum bandwidth up to 131 nm (FWHM) was obtained at a central wavelength of 1070 nm with output power of 136 mW and 80 MHz repetition rate. To our best knowledge, this spectrum bandwidth of NLP is the broadest among the reported YDF lasers. The autocorrelation function of pulse contained the short (30 fs) and long (4.6 ps) components. This short coherence light source is well suited for the optical coherent tomography used for ophthalmology at a wavelength of ∼1000 nm.
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