Results 11 to 20 of about 83,931 (261)

Attenuation Correction of the X-Band Dual-Polarization Phased Array Radar Based on Observed Raindrop Size Distribution Characteristics

Atmosphere, 2023
X-band dual-polarization phased array radar (XPAR-D) possesses high resolution and plays a significant role in detecting meso- and micro-scale convective systems.
Jiabao Feng, Xiantong Liu, Feng Xia, Yu Zhang, Xiaona Rao   +4 more
doaj   +1 more source

X-Band Radar Attenuation Correction Method Based on LightGBM Algorithm

Remote Sensing, 2023
X-band weather radar can provide high spatial and temporal resolution data, which is essential to precipitation observation and prediction of mesoscale and microscale weather.
Qiang Yang, Yan Feng, Li Guan, Wenyu Wu, Sichen Wang, Qiangyu Li   +5 more
doaj   +1 more source

Correction for the Attenuation Due to Atmospheric Gas and Stratiform Clouds in Triple-Frequency Radar Observations of the Microphysical Properties of Snowfall

Remote Sensing, 2023
For triple-frequency radar, the attenuation attributed to atmospheric gases and stratiform clouds is diverse due to different snowfall microphysical properties, particularly in regions far from the radar.
Yue Chang, Hongbin Chen, Xiaosong Huang, Yongheng Bi, Shu Duan, Pucai Wang, Jie Liu   +6 more
doaj   +1 more source

Integrated Correction Algorithm for X Band Dual-Polarization Radar Reflectivity Based on CINRAD/SA Radar

Atmosphere, 2020
The values of ratio a of the linear relationship between specific attenuation and specific differential phase vary significantly in convective storms as a result of resonance scattering.
Chao Wang, Chong Wu, Liping Liu, Xi Liu, Chao Chen   +4 more
doaj   +1 more source

An artefact of PET attenuation correction caused by iron overload of the liver in clinical PET-MRI

European Journal of Hybrid Imaging, 2017
Background Attenuation correction is one of the most important steps in producing quantitative PET image data. In hybrid PET-MRI systems, this correction is far from trivial, as MRI data are not correlated to PET attenuation properties of the scanned ...
Florian Büther, Benjamin Noto, Katharina Auf der Springe, Thomas Allkemper, Lars Stegger   +4 more
doaj   +1 more source

Regional Attenuation Correction of Weather Radar Using a Distributed Microwave-Links Network

Advances in Meteorology, 2017
The complex temporal-spatial variation of raindrop size distribution will affect the precision of precipitation quantitative estimates (QPE) produced from radar data, making it difficult to correct echo attenuation.
Yang Xue, Xi-chuan Liu, Tai-chang Gao, Chang-ye Yang, Kun Song   +4 more
doaj   +1 more source

Magnetic Resonace–Based Attenuation Correction for Micro–Single-Photon Emission Computed Tomography

Molecular Imaging, 2012
Attenuation correction is necessary for quantification in micro–single-photon emission computed tomography (micro-SPECT). In general, this is done based on micro–computed tomographic (micro-CT) images.
Vincent Keereman, Yves Fierens, Christian Vanhove, Tony Lahoutte, Stefaan Vandenberghe   +4 more
doaj   +1 more source

Are Quantitative Errors Reduced with Time-of-Flight Reconstruction When Using Imperfect MR-Based Attenuation Maps for ¹⁸F-FDG PET/MR Neuroimaging?

Applied Sciences, 2022
We studied whether TOF reduces error propagation from attenuation correction to PET image reconstruction in PET/MR neuroimaging, by using imperfect attenuation maps in a clinical PET/MR system with 525 ps timing resolution. Ten subjects who had undergone
Jani Lindén, Jarmo Teuho, Riku Klén, Mika Teräs   +3 more
doaj   +1 more source

Benchmarking attenuation correction procedures for six years of single-polarized C-band weather radar observations in South-West Germany

Geomatics, Natural Hazards & Risk, 2016
Rainfall-induced attenuation is a major source of underestimation for radar-based precipitation estimation at C-band. Unconstrained gate-by-gate correction procedures are known to be inherently unstable and thus not suited for unsupervised attenuation ...
Stephan Jacobi, Maik Heistermann
doaj   +1 more source

Positron-based attenuation correction for Positron Emission Tomography data using MCNP6 code

Journal of Radiation Research and Applied Sciences, 2016
This paper presents the Monte Carlo simulation of the attenuation correction for Positron Emission Tomography (PET) data using MCNP6 code. Two attenuation correction maps have been generated, one for correcting the attenuation effect in a homogeneous ...
M. Saeed, T. El Khoukhi, Y. Boulaich, E. Chakir, M. Maged, H. Boukhal, T. El Bardouni   +6 more
doaj   +1 more source