20 papers · ranked by Valyu relevance
H. M. S. S. Herath, Nuwan Madusanka, Eun Seo Choi, Song Woosub + 6 more
This study introduces a framework for estimating the optical scattering properties of thin-film phantoms using a custom-built Spectral-Domain Dental Optical Coherence Tomography (DEN-OCT) system operating within the 780-900 nm spectral range. The purpose of this work was to assess the performance of this system. The…
Lionel D. Fiske, Maurice C. G. Aalders, Mitra Almasian, Ton G. van Leeuwen + 3 more
'Ton G. van Leeuwen' 'Aggelos K. Katsaggelos' 'Oliver Cossairt' 'Dirk J. Faber'] Optical coherence tomography (OCT) is an optical technique which allows for volumetric visualization of the internal structures of translucent materials. Additional information can be gained by measuring the rate of signal attenuation in…
Wu Yuan, Carmen Kut, Wenxuan Liang, Xingde Li
Cancer is known to alter the local optical properties of tissues. The detection of OCT-based optical attenuation provides a quantitative method to efficiently differentiate cancer from non-cancer tissues. In particular, the intraoperative use of quantitative OCT is able to provide a direct visual guidance in real time…
Juan Liu, Jiulin Shi, Yijun Tang, Kaixing Zhu + 4 more
'Xuegang Chen' 'Xingdao He' 'Dahe Liu'] The attenuation coefficient of 532 nm light in water under different atmospheric conditions was investigated. Measurements were made over a two-year period at the same location and show that the attenuation coefficient is significantly influenced by the atmospheric environment.…
Cheng-Yu Lee, Xingde Li
We present an effective approach to compensate for multiple scattering effects in Quantitative Optical Coherence Tomography (qOCT) imaging, with the goal of accurately extracting tissue attenuation coefficients, which is crucial for precise clinical diagnosis. In clinical practice, especially for intra-operative…
Lang Xia
Acoustic characterization of ultrasound contrast agents (UCAs, coated microbubbles) relies on the attenuation theory that assumes the UCAs oscillate linearly at sufficiently low excitation pressures. Effective shell parameters of the UCAs can be estimated by fitting a theoretical attenuation curve to experimentally…
Meng Wang, Yangguang Bu, Zhaojie Dai, Shengyang Zeng + 1 more
Grain size is an important parameter in evaluating the properties of microstructures in metals. In this paper, the attenuation coefficient of Rayleigh waves is introduced to characterize grain size in heat treated 316L stainless steel. Rayleigh wave attenuation is measured using an angle beam wedge transducer as the…
Vladimir F. Krapivin, C. Varotsos, S. V. Marechek
A layer of vegetation over the soil surface absorbs microwave radiation emitted from the soil and some objects located under the vegetation canopy. This paper investigates the microwave propagation process within the vegetation layer and evaluate the attenuation coefficients. For this purpose, laboratory experimental…
А. В. Латышев, A. A. Yushkanov
Earlier electron influence on sound absorption in metal on basis of the assumption of deformation of Fermi–surfaces under the influence of a sound wave was considered. In the present work other approach to this problem will be considered. Our approach based on the account of dynamic (kinetic) interaction of electronic…
Lin Fa, Lili Li, Hong Gong, Wenhui Chen + 7 more
'Jifeng Liang' 'Yandong Zhang' 'Meishan Zhao' 'David J. Collins' 'Fabio Di Pietrantonio'] The traditional acoustic attenuation coefficient is derived from an analogy of the attenuation of an electromagnetic wave propagating inside a non-ideal medium, featuring only the attenuation of wave propagation. Nonetheless, the…
Adrien Renaud, Bing Tié, Anne-Sophie Mouronval, Jean‐Hubert Schmitt
In this paper, the effect on the ultrasonic attenuation of the grain size heterogeneity in polycrystals is analyzed. First, new analytical developments allowing the extension of the unified theory of Stanke and Kino to general grain size distributions are presented. It is then shown that one can additively decompose…
Xiling Liu, Feng Xiong, Qin Xie, Xiukun Yang + 3 more
'Shaofeng Wang' 'Carmelo Majorana'] In order to study the frequency-dependent attenuation characteristics of high-frequency elastic waves in rock-like materials, we conducted high-frequency elastic wave attenuation experiments on marble, granite, and red sandstone rods, and investigated the frequency dependence of the…
Joseph A. Sebastian, Eric M. Strohm, Emmanuel Chérin, Bahram Mirani + 3 more
Acoustic properties of biomaterials and engineered tissues reflect their structure and cellularity. High-frequency ultrasound (US) can non-invasively characterize and monitor these properties with sub-millimetre resolution. We present an approach to estimate the acoustic properties of cell-laden hydrogels that accounts…
Grzegorz Szamel, Elijah Flenner
Sound attenuation in low temperature amorphous solids originates from their disordered structure. However, its detailed mechanism is still being debated. Here we analyze sound attenuation starting directly from the microscopic equations of motion. We derive an exact expression for the zero-temperature sound damping…
Roland Pohlmeyer, Sergiy V. Avilov, Wolf Heusermann, Dagmar Diekhoff + 1 more
A wide variety of protocols have been proposed for optical clearing of tissues, whole-mount organs, and other bulky specimens to enable their volumetric fluorescence imaging. However, quantitative comparisons of tissue clearing protocols that take into account the fluorescence of the final specimens remain rare. Here…
Emanuele Organelli, Giorgio Dall’Olmo, Robert J. W. Brewin, Glen A. Tarran + 2 more
Marine microscopic particles profoundly impact global biogeochemical cycles, but our understanding of their dynamics is hindered by lack of observations. To fill this gap, optical backscattering measured by satellite sensors and in-situ autonomous platforms can be exploited. Unfortunately, these observations remain…
Yuning Zhao, Gregory J. Czarnota, Trevor H. Park, Rita J. Miller + 1 more
The study aims to assess the capability of Quantitative Ul-trasound (QUS) based on the backscatter coefficient (BSC) for classifying disease states, such as breast cancer response to neoadjuvant chemotherapy and quantifying fatty liver disease. We evaluate the effectiveness of an in situ titanium (Ti) bead as a…
Manuel Spitschan, Rafael Lazar, Christian Cajochen
Optical filters and tints manipulating short-wavelength light (so-called “blue-blocking” or “blue-attenuating”) are used as a remedy for a range of ocular, retinal, neurological and psychiatric disorders. In many cases, the only available quantification of the optical effects of a given optical filter is the spectral…
Sarthak Patnaik
We know that the diffusion is defined as the movement of molecules under a potential gradient. It is characterized by the diffusion coefficient. Diffusion coefficient determination can be done via various techniques, but in this paper, we have had a broad look at interferometry based optical methods for diffusion…
Georg Ramer, Ufuk Yilmaz, Savda Sam, Bernhard Lendl
We demonstrate a novel approach for bottom-illuminated atomic force microscopy infrared spectroscopy (AFM-IR). This nearfield technique is suitable for AFM-IR measurements in liquids, taking advantage of an attenuated total reflection (ATR) setup where the developing evanescent wave is used for photothermal excitation…