Results 21 to 30 of about 902,502 (236)

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

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

Accurate hybrid template–based and MR-based attenuation correction using UTE images for simultaneous PET/MR brain imaging applications

BMC Medical Imaging, 2018
Background Attenuation correction is one of the most crucial correction factors for accurate PET data quantitation in hybrid PET/MR scanners, and computing accurate attenuation coefficient maps from MR brain acquisitions is challenging.
Jakub Baran, Zhaolin Chen, Francesco Sforazzini, Nicholas Ferris, Sharna Jamadar, Ben Schmitt, David Faul, Nadim Jon Shah, Marian Cholewa, Gary F. Egan   +9 more
doaj   +1 more source

Attenuation of Melting Ice at $C$-Band Frequencies, Observed Using Dual-Radar Measurements During the RELAMPAGO Campaign

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2023
In this article, the melting ice attenuation in $C$-band radars is studied. Dual-$C$-band radar observations from the Remote Sensing of Electrification, Lightning, and Mesoscale/Microscale Processes With Adaptive Ground Observations (RELAMPAGO) campaign ...
Ivan Arias Hernandez, V. Chandrasekar
doaj   +1 more source

Direct attenuation correction for 99mTc-3PRGD2 chest SPECT lung cancer images using deep learning

Frontiers in Oncology, 2023
IntroductionThe attenuation correction technique of single photon emission computed tomography (SPECT) images is essential for early diagnosis, therapeutic evaluation, and pharmacokinetic studies of lung cancer.
Haiqun Xing, Tong Wang, Xiaona Jin, Jian Tian, Jiantao Ba, Hongli Jing, Fang Li   +6 more
doaj   +1 more source

Going beyond the borders : field-of-view extension in MR/PET hybrid imaging [PDF]

, 2012
The recent combination of Magnetic Resonance Imaging (MRI) and Positron Emission Tomography (PET) is of emerging interest in clinical routine. On the one hand, MRI is a widely-used diagnostic tool in medical practice.
Blumhagen, Jan Ole
core   +1 more source

Matching comparison between Satellite radar DPR and ground-based radar CR and preliminary study of systematic error

暴雨灾害, 2021
In this paper, the observation data measured by the dual-frequency precipitation radar DPR on board the GPM satellite and the ground-based Ka/Ku dual-band radar CR of the Guangdong Longmen Observatory from April to September 2019 are matched in time and ...
Zhenyu ZENG, Liping LIU, Jiafeng ZHENG, Minglong ZOU, Boyong LI   +4 more
doaj   +1 more source

A Study on the Gamma-ray Attenuation Parameters of Some Commercial Salt Samples

Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2020
The purpose of this study is to calculate self-attenuation correction factors, linear (LAC) /mass attenuation coefficients (MAC), half value layers (HVL) and tenth value layers (TVL) of different brands of commercial salt samples using gamma-ray ...
Canel Eke
doaj   +1 more source

Attenuation Correction of Weather Radar Reflectivity with Arbitrary Oriented Microwave Link

Advances in Meteorology, 2017
To compensate radar reflectivity for attenuation effect, a new method for attenuation correction of the radar reflectivity using arbitrary oriented microwave link (referred henceforth to as ACML) is developed and evaluated.
Peng Zhang, Xichuan Liu, Zhaoming Li, Zeming Zhou, Kun Song, Pinglv Yang   +5 more
doaj   +1 more source