Article
Multidisciplinary Sciences
Sylwia M. Kolenderska, Maciej Szkulmowski
Summary: Quantum Optical Coherence Tomography (Q-OCT) offers high resolution and immunity to dispersion, but suffers from artifacts. Two algorithms are proposed to address artifacts in Fd-Q-OCT, despite effective methods already existing in Time-domain Q-OCT.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Electrical & Electronic
Dongmei Huang, Feng Li, Zihao Cheng, Xinhuan Feng, P. K. A. Wai
Summary: The article introduces a novel discrete FDML laser with intracavity optical intensity modulation, which can generate swept signals with comb lines uniformly distributed in the frequency domain and achieve generating discrete k-space uniform swept signals with different FSRs and pulse durations.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Medicine, General & Internal
Lisa Toto, Maria Ludovica Ruggeri, Federica Evangelista, Chiara Trivigno, Rossella D'Aloisio, Chiara De Nicola, Pasquale Viggiano, Emanuele Doronzo, Marta Di Nicola, Annamaria Porreca, Rodolfo Mastropasqua
Summary: This study investigates the parameters of optical coherence tomography (OCT) and OCT angiography (OCTA) in patients with neovascular age-related macular degeneration (nAMD) and macular neovascularization (MNV) types 1, 2, and 3. The results showed significant differences in CVI, CMT, and ORCCFA between MNV 1 and the other two groups. CVI was significantly different between MNV 1 and healthy controls and between MNV 1 and MNV 2. ORCCFA and CMT were significantly different between MNV 1 and MNV 2. There was no statistically significant difference in subfoveal choroidal thickness (SFCT) among the three groups.
JOURNAL OF CLINICAL MEDICINE
(2023)
Article
Optics
Danielis Rutkauskas, Egidijus Auksorius
Summary: Full-field optical coherence tomography (FF-OCT) is a camera-based interferometric microscopy technique that can image deep in tissue with high spatial resolution. In this study, digital confocal line scanning is implemented in time-domain FF-OCT using a rolling-shutter camera and digital micromirror device (DMD). The improvement in signal-to-noise ratio by an order of magnitude is demonstrated on a sample.
Article
Optics
Bo Wang, Xiaoling Qin, Wenping Li, Zeren Li, Liguo Zhu
Summary: A terahertz sparse deconvolution method based on a learned iterative shrinkage and thresholding algorithm (LISTA) is proposed in this paper. The method achieves more accurate estimation of echoes and has faster processing speed compared to other deconvolution algorithms. Experimental results demonstrate significant improvements in detecting defects of different sizes and depths, making the technique suitable for nondestructive testing of thick samples.
Article
Ophthalmology
Min-woo Lee, Min-su Kim, Hwa-young Yu, Kee-sup Park, Young-hoon Lee, Jung-yeul Kim
Summary: The study aims to identify the impact of the Weiss ring on the measurement of mean and sectoral peripapillary retinal nerve fiber layer (pRNFL) thicknesses. It found that eyes with a Weiss ring showed thinner pRNFL thicknesses compared to normal eyes, especially in the inferior sector. This could be a significant confounding factor in the analysis of pRNFL changes, particularly in patients with glaucoma.
AMERICAN JOURNAL OF OPHTHALMOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Daewoon Seong, Deokmin Jeon, Ruchire Eranga Wijesinghe, Kibeom Park, Hyeree Kim, Euimin Lee, Mansik Jeon, Jeehyun Kim
Summary: Researchers developed an ultrahigh-speed SD-OCT system with a 1 MHz A-scan rate using the STDM method, and successfully integrated it with GPU parallel processing to achieve a volume rate of 8 vol/s.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Ophthalmology
Ko Eun Kim, Seong Joon Ahn, Se Joon Woo, Kyu Hyung Park, Byung Ro Lee, Yeon-Kyung Lee, Yoon-Kyoung Sung
Summary: This study investigated the use of a retinal thickness deviation map for screening hydroxychloroquine retinopathy, showing that this method can enhance diagnostic performance when used in conjunction with traditional screening methods. The map identified different abnormal patterns of retinopathy and had high sensitivity and specificity in diagnosing the condition.
Article
Optics
Yusi Miao, Jun Song, Myeong Jin Ju
Summary: A fast and practical computational cross-calibration method for multiple spectrometers is described, which constructs a signal correlation matrix and can be used for physical alignment or numerical matching of spectra. The performance is comparable to the previously reported optimization approach.
Article
Optics
Daewoon Seong, Won Ki, Pilun Kim, Jaeyul Lee, Sangyeob Han, Soojin Yi, Hong Kyun Kim, Mansik Jeon, Jeehyun Kim
Summary: This study developed a virtual intraoperative OCT angiography integrated surgical microscope, which can simultaneously visualize the morphological tissue structure and microvasculature data of the surgical region, demonstrating its potential application in in vivo imaging and simulated surgeries of small animals.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Optics
Yusi Miao, Mahsa Siadati, Jun Song, Da Ma, Yifan Jian, Mirza Faisal Beg, Marinko Sarunic, Myeong Jin Ju
Summary: The article presents a coherent buffer averaging technique for megahertz-rate retinal imaging to improve OCTA contrast, demonstrating a 10-fold increase in phase alignment among buffers. This method provides better OCTA contrast than conventional approaches with a faster acquisition time.
Article
Optics
Tanbin Shao, Kecheng Yang, Min Xia, Wenping Guo
Summary: In this study, an enhanced dispersion-encoded full-range spectral interferometry technique is proposed and validated for improving measurement accuracy in samples with significant depth, inclination, and roughness. By removing the direct current and preserving data with good phase continuity, the accuracy of phase compensation is improved. The proposed technique extends the depth measurement range and achieves high axial measurement precision.
Article
Optics
Jianan Fang, Kun Huang, E. Wu, Ming Yan, Heping Zeng
Summary: This article introduces an infrared 3D imaging system capable of detecting three-dimensional structure and reflectivity information. The system operates at single-photon sensitivity and femtosecond timing resolution, enabling imaging under low-light conditions. By nonlinear frequency upconversion and recording with a silicon camera, the presented system achieves high lateral and depth resolutions for 3D reconstruction. Additionally, a numerical denoiser based on spatiotemporal correlation allows the retrieval of object profile and reflectivity even with a detected flux below 0.05 photons/pixel/second. This infrared 3D imager features high detection sensitivity, precise timing resolution, and wide-field operation, offering new possibilities in life and material sciences.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Optics
Nan Ge, Yixi Liu, Xiang Xu, Xuedian Zhang, Minshan Jiang
Summary: This study proposes a fast generative adversarial network (GAN) for generating high-fidelity optical coherence tomography (OCT) images. By redesigning the network architecture, the image quality of the synthetic images is improved, and high-resolution images can be generated in a short time with limited computing resources.
Article
Optics
Xiangsen Guo, Guangyuan Ren, Jianbo Tang
Summary: In this study, an autocorrelation analysis-based optical coherence tomography (OCT) method was introduced for accurate measurement of blood flow velocity in the capillary network. The axial blood flow velocity was obtained from the phase change in the decorrelation period of the first-order field autocorrelation function (g1) of the OCT field data. The proposed method showed accurate measurement of axial speed in the range of 0.5-15 mm/s in phantom experiments, and it achieved robust axial velocity measurements with more than five times shorter acquisition time compared to phase-resolved Doppler optical coherence tomography (pr-DOCT) in living animals.
