Results 31 to 40 of about 26,357 (239)
Frontiers in Physics, 2022 Photoacoustic imaging can be used to extract functional information at the molecular level for imaging the whole body of small animals in vivo. However, the use of a mechanical scanner to image the whole body involves acquiring the data for a period of ...
Haeni Lee +6 more
doaj +1 more source
Comparison of photoacoustic spectroscopy and cavity ring-down spectroscopy for ambient methane monitoring at Hohenpeißenberg [PDF]
Atmospheric Measurement Techniques, 2023 With an atmospheric concentration of approximately 2000 parts per billion (ppbV, 10−9), methane (CH4) is the second most abundant greenhouse gas (GHG) in the atmosphere after carbon dioxide (CO2).
M. Müller +9 more
doaj +1 more source
Accelerated High-Resolution Photoacoustic Tomography via Compressed Sensing [PDF]
, 2016 Current 3D photoacoustic tomography (PAT) systems offer either high image quality or high frame rates but are not able to deliver high spatial and temporal resolution simultaneously, which limits their ability to image dynamic processes in living tissue.
Arridge, Simon +7 more
core +2 more sources
Scientific Reports, 2017 Photoacoustic sensing and imaging techniques have been studied widely to explore optical absorption contrast based on nanosecond laser illumination. In this paper, we report a long laser pulse induced dual photoacoustic (LDPA) nonlinear effect, which ...
Fei Gao +6 more
doaj +1 more source
Sensors, 2021 Multispectral photoacoustic imaging is a powerful noninvasive medical imaging technique that provides access to functional information. In this study, a set of methods is proposed and validated, with experimental multispectral photoacoustic images used ...
Aneline Dolet +6 more
doaj +1 more source
, 2017 The resolution of photoacoustic imaging deep inside scattering media is limited by the acoustic diffraction limit. In this work, taking inspiration from super-resolution imaging techniques developed to beat the optical diffraction limit, we demonstrate ...
Arnal, Bastien +2 more
core +3 more sources
Approximate k-space models and Deep Learning for fast photoacoustic reconstruction [PDF]
, 2018 We present a framework for accelerated iterative reconstructions using a fast and approximate forward model that is based on k-space methods for photoacoustic tomography. The approximate model introduces aliasing artefacts in the gradient information for
Arridge, Simon +6 more
core +2 more sources
Photoacoustic investigation of QCL modulation techniques
Journal of Physics: Conference Series, 2010 High detection sensitivity and spectral selectivity is important for gas analysers to identify the measured compound and to detect low concentrations. We investigated three different modulation methods – pulse gate modulation, pulse frequency modulation and chopper modulation – for a new pulsed quantum cascade laser based photoacoustic sensor.
M Germer, M Wolff
openaire +1 more source
In vivo super-resolution photoacoustic computed tomography by localization of single dyed droplets [PDF]
, 2020 The spatial resolution of photoacoustic (PA) computed tomography (PACT) is limited by acoustic diffraction. Here, we report in vivo superresolution PACT, which breaks the acoustic diffraction limit by localizing the centers of single dyed droplets.
Li, Lei, Wang, Lihong V., Zhang, Pengfei
core
A Multi-Grid Iterative Method for Photoacoustic Tomography [PDF]
, 2016 Inspired by the recent advances on minimizing nonsmooth or bound-constrained convex functions on models using varying degrees of fidelity, we propose a line search multigrid (MG) method for full-wave iterative image reconstruction in photoacoustic ...
Holman, Sean, Javaherian, Ashkan
core +3 more sources