Results 71 to 80 of about 90,945 (202)

Quantitative Diffusion and T2 Mapping Using RF‐Modulated Phase‐Based Gradient Echo Imaging

Magnetic Resonance in Medicine, Volume 96, Issue 1, Page 49-65, July 2026.
ABSTRACT Purpose To introduce and evaluate the feasibility of a novel RF‐phase modulated gradient echo (GRE) method for quantitative diffusion MRI, aimed at mitigating geometric distortion and enabling high‐resolution 3D quantitative diffusion/T2 mapping as a complementary alternative to conventional DWI.
Daiki Tamada, Ali Pirasteh, David F. Jarrard, Diego Hernando, Scott B. Reeder   +4 more
wiley   +1 more source

Reverse-Link Performance of Synchronous DS-CDMA Systems in Dispersive Rician Multipath Fading Channels

, 2003
The reverse-link performance of synchronous DS-CDMA is investigated in Rician multipath fading environments. The numerical results show that the performance benefits of synchronous transmission depend on the specular path’s power as well as on the ...
Hwang, S.H., Hanzo, L.
core   +1 more source

Simulation‐Informed Evaluation of Microvascular Parameter Mapping for Diffusion MR Imaging of Solid Tumours

Magnetic Resonance in Medicine, Volume 96, Issue 1, Page 387-402, July 2026.
ABSTRACT Purpose We aim to inform the design of new diffusion MRI (dMRI) approaches for microvasculature quantification that enhance the biological specificity of imaging towards cancer. Methods We adopted simulation‐informed modelling of the vascular dMRI signal. We synthesised signals from 1500 synthetic vascular networks, for a variety of protocols (
Anna Kira Voronova, Olivia Prior, Athanasios Grigoriou, Francesc Salvà, Elena Elez, Luz M. Atlagich, Roser Sala‐Llonch, Marco Palombo, Els Fieremans, Dmitry S. Novikov, Raquel Perez‐Lopez, Francesco Grussu   +11 more
wiley   +1 more source

PERFORMANCE OF TURBO CODED SIGNALS OVER FADING CHANNELS

Electrica, 2019
In this paper, the performance of turbo coded signals are investigated for different frame numbers and encoder structures over Rician fading channels. The numerical results demonstrate the error performance degradation due to fading channel frame numbers
Oguz BAYAT, Hissam ALNAJJAR, Osman N. UCAN, Onur OSMAN   +3 more
doaj   +2 more sources

The Role of Dendritic Spines in Water Exchange Measurements With Diffusion MRI: Double Diffusion Encoding and Free‐Waveform MRI

NMR in Biomedicine, Volume 39, Issue 7, July 2026.
Geometric water exchange in dendritic spines imparts a similar signature on diffusion‐MRI signals as permeative, transmembrane water exchange. Current diffusion MRI methods are non‐specific to geometric and permeative exchange. This work proposes a method to disentangle these two modes of exchange, yielding both more accurate estimates of permeative ...
Arthur Chakwizira, Kadir Şimşek, Filip Szczepankiewicz, Marco Palombo, Markus Nilsson   +4 more
wiley   +1 more source

Upconverting Nanoparticles for Bimodal Luminescence and Magnetic Resonance Imaging of Langerhans Islets

Small Science, Volume 6, Issue 7, July 2026.
Monodisperse dumbbell‐shaped core–shell upconversion nanoparticles (CS‐UCNPs) codoped with Fe, Yb, Er ions and coated with NaGdF4:Nd, Yb, Tb shell provide efficient T1/T2*‐weighted magnetic resonance imaging (MRI) contrast and bright red emission under near‐infrared excitation. Colloidally stable poly(methyl vinyl ether‐alt‐maleic acid) (PMVEMA)‐coated
Oleksandr Shapoval, Daniel Jirák, Zuzana Berková, Miroslav Šlouf, Olga Kočková, Hana Engstová, Aminadav Halili, David Červený, Petr Ježek, Daniel Horák   +9 more
wiley   +1 more source

Genetic algorithm-based PTS with CNN for PAPR and BER reduction in FBMC systems under fading channels

Ain Shams Engineering Journal
The Filter Bank Multicarrier (FBMC) is a promising candidate for next-generation wireless systems because of its superior spectral efficiency and resilience to synchronization errors.
Arun Kumar, Aziz Nanthaamornphong
doaj   +1 more source

Simple Expression of Ergodic Capacity for Rician Fading Channel

IEICE Transactions on Communications, 2010
In this letter, a new exact expression of the ergodic channel capacity for a Rician fading channel is provided that is written in terms of exponential integral and incomplete gamma function. Also, a good approximation of the Rician fading channel capacity is derived from the exact expression and its accuracy is numerically verified.
KOH, Il-Suek, HWANG, Taewon
openaire   +2 more sources

ANALISIS BEAMFORMING ADAPTIF PADA SMART ANTENNA MENGGUNAKAN ALGORITMA ROBUST KALMAN FILTER PADA KONDISI RICIAN FADING NONSTASIONER

Teknologi dan Kejuruan, 2016
Tujuan penelitian untuk menerapkan algoritma filter Kalman robust pada kondisi rician fading non stasioner berdasarkan analisis perbandingan jumlah nulling, nilai output HPBW dan kecepatan konvergensi untuk mencapai bobot minimum.
Andriana Kusuma Dewi, Sholeh Hadi Pramono, Onny Setyawati   +2 more
doaj   +1 more source

Reverse-Link Performance of Synchronous Cellular DS-CDMA Networks in Dispersive Rician Multipath Fading Channels

, 2004
In this paper, the reverse-link performance of synchronous DS-CDMA cellular networks is investigated in Rician multipath fading environments. The system’s performance is evaluated in terms of the achievable average bit error rate (BER) and the user ...
Hwang, S-H., Hanzo, L.
core   +1 more source