Results 31 to 40 of about 18,687 (226)

Photoacoustic nanoprobe for β-galactosidase activity detection and imaging in vivo [PDF]

Journal of Innovative Optical Health Sciences, 2019
Detection and visualization of β-galactosidase (β-gal) is essential to reflect its physiological and pathological effects on human health and disease, but it is still challenging to precisely track β-gal in vivo owing to the limitation of current ...
Qin Zeng, Yunxia Wu, Tao Zhang
doaj   +1 more source

Nonlinear mechanisms in photoacoustics—Powerful tools in photoacoustic imaging

Photoacoustics, 2021
Many nonlinear effects have been discovered and developed in photoacoustic imaging. These nonlinear mechanisms have been explored for different utilizations, such as enhancing imaging contrast, measuring tissue temperature, achieving super-resolution imaging, enabling functional imaging, and extracting important physical parameters. This review aims to
Rongkang Gao, Zhiqiang Xu, Yaguang Ren, Liang Song, Chengbo Liu   +4 more
openaire   +4 more sources

Fiber endface photoacoustic generator for quantitative photoacoustic tomography

Optics Letters, 2021
We demonstrate a novel fiber endface photoacoustic (PA) generator using infrared (IR) 144 laser dye dispersed within an ultraviolet adhesive. The generator provides a wide acoustic bandwidth in the transducer frequency range of 2–7 MHz, high thermal conversion efficiency ( > 90 % ), good PA signal controllability (well ...
Guang Yang, Hengbo Huang, Hongbo Luo, Sitai Kou, Eghbal Amidi, Samuel Achilefu, Quing Zhu   +6 more
openaire   +3 more sources

Multimodal intravascular imaging technology for characterization of atherosclerosis [PDF]

Journal of Innovative Optical Health Sciences, 2020
Early detection of vulnerable plaques is the critical step in the prevention of acute coronary events. Morphology, composition, and mechanical property of a coronary artery have been demonstrated to be the key characteristics for the identification of ...
Yan Li, Jason Chen, Zhongping Chen
doaj   +1 more source

Neurovascular photoacoustic tomography [PDF]

Frontiers in Neuroenergetics, 2010
Neurovascular coupling refers to the relationship between neuronal activities and downstream hemodynamic responses. Photoacoustic tomography (PAT), enabling comprehensive label-free imaging of hemodynamic activities with highly scalable penetration and spatial resolution, has great potential in the study of neurovascular coupling.
Hu, Song, Wang, Lihong V.
openaire   +4 more sources

Anodically Bonded Photoacoustic Transducer: An Approach towards Wafer-Level Optical Gas Sensors

Sensors, 2022
We present a concept for a wafer-level manufactured photoacoustic transducer, suitable to be used in consumer-grade gas sensors. The transducer consists of an anodically bonded two-layer stack of a blank silicon wafer and an 11 µm membrane, which was wet-
Simon Gassner, Rainer Schaller, Matthias Eberl, Carsten von Koblinski, Simon Essing, Mohammadamir Ghaderi, Katrin Schmitt, Jürgen Wöllenstein   +7 more
doaj   +1 more source

Non‐Monotonic Changes in the Thermal Conductivity of Conjugated Polymer Films with Increasing Levels of Chemical Doping

Advanced Functional Materials, EarlyView.
Thermal conductivity changes non‐monotonically as regioregular (RR) and regiorandom (RRa) P3HT films are doped with F4TCNQ as a function of the extent to which P3HT is doped: an increase in thermal conductivity is observed upon lightly doping P3HT compared to the undoped film, followed by a decrease in the heavily doped regime. ABSTRACT The performance
Reid W. Wilson, Xinping Shi, Diego Garcia Vidales, Abigail Slimp, Zerina Mehmedović, Alexander F. Simafranca, Eric C. Wu, Sarah H. Tolbert, Richard B. Wilson, Benjamin J. Schwartz   +9 more
wiley   +1 more source

Cross-Medium Photoacoustic Communications: Challenges, and State of the Art

Sensors, 2022
The current era is notably characterized by the major advances in communication technologies. The increased connectivity has been transformative in terrestrial, space, and undersea applications. Nonetheless, the water medium imposes unique constraints on
Muntasir Mahmud, Md Shafiqul Islam, Akram Ahmed, Mohamed Younis, Fow-Sen Choa   +4 more
doaj   +1 more source

Nanoplatforms for Sentinel and Tumor‐Draining Lymph Node Mapping: From Visualization to Pathway‐Informed Staging

Advanced Healthcare Materials, EarlyView.
Lymphotropic nanoplatforms integrate multimodal imaging with therapeutic guidance to map sentinel and tumor‐draining lymph nodes, revealing functional drainage, metastatic involvement, and nodal accessibility, while providing mechanistic insight to support precision surgical and therapeutic interventions.
Xu Chen, Nina Li, Meiyan Zou, Zihao Zhou, Rongwei Xu, Weiyao Feng, Xinyuan Zhao, Li Cui   +7 more
wiley   +1 more source

Methodological Comparison between a Novel Automatic Sampling System for Gas Chromatography versus Photoacoustic Spectroscopy for Measuring Greenhouse Gas Emissions under Field Conditions

Sensors, 2016
Trace gases such as nitrous oxide (N2O), methane (CH4), and carbon dioxide (CO2) are climate-related gases, and their emissions from agricultural livestock barns are not negligible.
Alexander J. Schmithausen, Manfred Trimborn, Wolfgang Büscher   +2 more
doaj   +1 more source