Results 61 to 70 of about 1,259,174 (207)

Toward Optimized Intravoxel Incoherent Motion (IVIM) and Compartmental T2 Mapping in Abdominal Organs

Magnetic Resonance in Medicine, Volume 95, Issue 6, Page 3161-3175, June 2026.
ABSTRACT Purpose To quantitatively assess the bias in the intravoxel incoherent motions (IVIM)–derived pseudo‐diffusion volume fraction (f) caused by the differences in relaxation times between the tissue and fluid compartments, and to develop a two‐dimensional (b‐value‐TE) fitting approach for simultaneous T2 and IVIM parameter estimation along with ...
Julia Stabinska, Thomas A. Thiel, Hans‐Jörg Wittsack, Alexandra Ljimani, Helge J. Zöllner   +4 more
wiley   +1 more source

Serial Acquisition of DS-CDMA Signals in Multipath Fading Mobile Channels

, 2001
This paper compares the mean acquisition time (MAT) performance of two serial search acquisition schemes over frequency-selective multipath Rayleigh fading channels.
Yang, L-L., Hanzo, L.
core   +1 more source

Hierarchical Bayesian Modelling Improves Microstructural Parameter Mapping in Diffusion and Exchange MRI Data

NMR in Biomedicine, Volume 39, Issue 6, June 2026.
Our hierarchical Bayesian modelling (HBM) technique is demonstrated in two neuroimaging diffusion MRI models. When compared with least‐squares (LSQ) minimisation, HBM increased the accuracy, precision, contrast‐to‐noise ratio and parameter map quality in simulated and human data. HBM also resolved local parameter variations associated with white matter
Elizabeth Powell, Mark Maskery, Hedley C. A. Emsley, Laura M. Parkes, Geoff J. M. Parker, Paddy J. Slator   +5 more
wiley   +1 more source

Channel Estimation for Stacked Intelligent Metasurfaces in Rician Fading Channels

IEEE Wireless Communications Letters
accepted in IEEE ...
Anastasios K. Papazafeiropoulos, Pandelis Kourtessis, Dimitra I. Kaklamani, Iakovos S. Venieris   +3 more
openaire   +3 more sources

Exact BER of Rectangular-Constellation QAM Subjected to Asynchronous Co-Channel Interference and Nakagami-m Fading [PDF]

, 2006
The exact average bit error ratio (BER) of the rectangular quadrature amplitude modulation (QAM) constellation is studied in the context of asynchronous co-channel interference (CCI) and Nakagami-m fading.
Liu, X., Hanzo, L., Lajos Hanzo, Xiang Liu   +3 more
core   +1 more source

Data‐Driven Characterization of Knee Structures Using Non‐Negative Matrix Factorization of 3D Multi‐Echo UTE MRI

NMR in Biomedicine, Volume 39, Issue 6, June 2026.
Non‐negative matrix factorization (NMF) can derive tissue features in a data‐driven manner without relying on biophysical model assumptions. First‐time application of NMF to 3D multi‐echo UTE knee MRI revealed four reproducible components associated with tissues of fast and slow transverse relaxation, water–fat mixture (chemical shift), and fat tissue.
Céline Smekens, Pieter Van Dyck, Patrick S. Fuchs, Jan Sijbers, Thomas Janssens, Ben Jeurissen   +5 more
wiley   +1 more source

Hybrid deep learning for robust spectrum sensing over AWGN and fading channels

EURASIP Journal on Advances in Signal Processing
Accurate and reliable spectrum sensing (SS) is crucial for optimal spectrum usage in cognitive radio (CR) networks under challenging low signal-to-noise ratio (SNR) and fading channel conditions. The Bi-CLNetwork, a hybrid deep learning (DL) architecture,
Sarah Yahya Salih Al-Hajm, Ibrahim Develi, Kenan Kockaya   +2 more
doaj   +1 more source

Capture Effect in the FSA-Based Networks under Rayleigh, Rician and Nakagami-m Fading Channels

Applied Sciences, 2018
Framed slotted aloha (FSA) is a multiple access protocol widely used in wireless communication for its simplicity and effectivity. The theoretical maximum channel utilization of FSA is approximately equal to 0.37 irrespective of the capture effect.
Yang Wang, Jianghong Shi, Lingyu Chen
doaj   +1 more source

Mapping Intracellular Volume Fraction With Susceptibility Source Decomposition as a Marker for Tissue Cellularity

Journal of Magnetic Resonance Imaging, Volume 63, Issue 4, Page 1092-1105, April 2026.
ABSTRACT Background Pathophysiological changes affect tissue cell composition and density. For example, neurodegenerative disorders and brain tumors are associated with cell loss and abnormal accumulation, respectively. In these scenarios, if monitored and tracked, tissue cellularity might be used to inform clinical diagnosis and management. Purpose To
Giulia Debiasi, Oliver C. Kiersnowski, Giovanni Librizzi, Luca Roccatagliata, Renzo Manara, Mauro Costagli, Alessandra Bertoldo, Chunlei Liu   +7 more
wiley   +1 more source