Article
Optics
Seongjin Bak, Gyeong Hun Kim, Hansol Jang, Chang-Seok Kim
Summary: The optical Vernier sampling method using a dual-comb-swept laser allows for measuring absolute distances in a multi-layer target. By designing a new type of dual-comb-swept laser, the issue of optical aliasing is solved, enabling accurate measurements of absolute distances.
PHOTONICS RESEARCH
(2021)
Article
Clinical Neurology
Michael J. A. Girard, Satish Panda, Tin Aung Tun, Elisabeth A. Wibroe, Raymond P. Najjar, Tin Aung, Alexandre H. Thiery, Steffen Hamann, Clare Fraser, Dan Milea
Summary: This study developed a deep learning algorithm to automatically identify major structures of the optic nerve head (ONH) in 3D optical coherence tomography (OCT) scans and differentiate between optic disc drusen (ODD), papilledema, and healthy ONHs. The algorithm was able to accurately isolate tissues and regions associated with ODD and achieved high classification performance.
Article
Optics
Norman Lippok, Benjamin J. Vakoc
Summary: Circular-ranging optical coherence tomography (CR-OCT) systems using time-stepped frequency comb sources generate complex interference fringe signals. A mathematical framework is developed to relate the RF properties of these signals to the parameters of the frequency comb source, highlighting non-intuitive mechanisms affecting imaging performance. These findings provide a foundation for designing and optimizing time-stepped frequency comb sources and systems.
Article
Materials Science, Characterization & Testing
Wolfgang Haderer, Edgar Scherleitner, Jens Gseller, Bettina Heise, Thomas Mitter, Martin Ryzy, Bernhard Reitinger, Mike Hettich
Summary: We present an improved non-destructive and non-contact measurement technique using all-optical laser ultrasound to measure the hardness penetration depth of thermally hardened steel parts. The hardening of the near-surface region causes stratification with layers of different microstructural characteristics due to changes in grain size. By employing spatially resolved ultrasonic backscattering signals, we can visualize the subsurface axial and lateral hardness profile. We conducted experiments on three common steel grades with different microstructural characteristics and hardened layer thicknesses ranging from 3 to 10 mm.
NDT & E INTERNATIONAL
(2023)
Article
Multidisciplinary Sciences
Kunal M. Shelote, Miss Meera, Kumar Supravin, Supratic Gupta
Summary: The primary cause of concrete deterioration is water permeability through it. Different codes of practices are used to study this, but they have limitations such as long testing duration and undetectable penetration for high-strength concrete. Therefore, a new method called Modified water permeability is proposed in this article.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Ophthalmology
Weam Abdeen, Amanne F. Esmael, Ghada Gawdat, Dina El-Fayoumi
Summary: The study used HH AS-OCT to examine ACA structures and parameters in PCG and normal infant eyes, finding that PCG infants had larger ACA width, reduced IT, and lower identification rates of TM and SC. Abnormal structures, anterior iris insertion, and iridotrabeculodysgenesis were observed in PCG eyes.
Article
Geochemistry & Geophysics
Xiangxiang Zhang, Kai Gu, Chengyu Liu, Yangbing Cao, J. G. Wang, Feng Gao
Summary: This paper investigates the front motion of water, nitrogen, and CO2 in anisotropic shale reservoirs and establishes a numerical model to predict the front motion of different types of fluids. The results show that the fluid front motion increases with the increase of permeability and mobility, and the nitrogen front motion is the largest while the water front motion is the smallest.
Article
Pharmacology & Pharmacy
Raghu Raj Singh Thakur, Samer Adwan, Ismaiel Tekko, Karim Soliman, Ryan F. Donnelly
Summary: This study explored a non-invasive alternative to intraocular injections using laser irradiation of ocular tissues. The experiment demonstrated enhanced permeation of molecules through ocular tissues on laser irradiation, showing potential for enhancing intraocular delivery of both small and large molecule drugs.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2021)
Article
Acoustics
Andres Coila, Julien Rouyer, Omar Zenteno, Adam Luchies, Michael L. Oelze, Roberto Lavarello
Summary: In this study, a method using attenuation maps constructed using full angular spatial compounding (FASC) for attenuation compensation when imaging integrated backscatter coefficients (BSCs) was proposed. Experimental validation showed that reliable estimation of BSCs can be achieved when a self-consistent attenuation compensation stemming from prior estimation of an accurate attenuation coefficient slope (ACS) map is used.
Article
Medicine, General & Internal
Yoshiaki Takahashi, Takao Hirano, Marie Nakamura, Yoshiaki Chiku, Ken Hoshiyama, Satoko Akahane, Keita Akahane, Toshinori Murata
Summary: This study found that the use of SF6 gas during anterior chamber surgery may lead to decreased ACD and IOL position, especially in cases with a 6 mm diameter IOL, warning of potential complications. However, at 1 month postoperatively, there were no significant differences in ACD, IOL position, and RPE among different groups, regardless of IOL diameter or SF6 gas injection.
JOURNAL OF CLINICAL MEDICINE
(2022)
Article
Optics
Zoya Alam, Raju Poddar
Summary: Zebrafish, as a vertebrate model, is widely used in various fields. This study demonstrates the use of optical coherence tomography and optical coherence tomography angiography to image the developing zebrafish, allowing for detailed visualization of microstructures and microvasculature.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Construction & Building Technology
Phat Tan Huynh, Yuko Ogawa, Kenji Kawai, Phuong Trinh Bui
Summary: This study aims to evaluate the cementing efficiency factor of low-calcium fly ash for chloride-penetration resistance in concretes using chloride-penetration depth. Results show that the k-value of the fly ash based on the penetration depth was higher than 2 and increased with the degree of reaction. A correlation between the k-value for chloride-penetration resistance and concrete strength development was also identified.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Zou Yue, Wei Huajiang, Yang Hongqin, Xie Shusen, Wu Guoyong
Summary: The effect of different ultrasound intensities on the permeability and light penetration depth of glycerol solutions in human skin was investigated. Ultrasound was found to accelerate the penetration of glycerol solution and enhance light transmission through the skin. The optical clearing effect of the skin increased with increasing ultrasound intensity.
LASER & OPTOELECTRONICS PROGRESS
(2022)
Article
Optics
Xiupin Wu, Wanrong Gao, Zhiyuan Qiu, Jiayong Yan, Xiaoou Li
Summary: In this study, a time-frequency analysis method was proposed to compensate for depth-dependent dispersion in noninvasive imaging. The algorithm was validated through simulation and experimental results showed a significant improvement in image resolution.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Pharmacology & Pharmacy
Yaxin Hu, Weixiong Weng, Yuxi Zhang, Ying Zhu, Xinyu Zhang
Summary: This study utilized superficial ultrasound exposure and a drug-loaded hydrogel with long residence time to achieve transscleral drug delivery. By optimizing the hydrogel ratio and ultrasound parameters, drug release efficiency was enhanced. The method resulted in enhanced transscleral delivery in porcine and rabbit scleras, as well as increased drug penetration depth.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2023)