Results 221 to 230 of about 106,361 (281)

Low-Altitude Target Localization Method Based on Exogenous Radar with Multi-Base Station and 5G SSB Signals. [PDF]

Sensors (Basel)
Xu Y, Tu G, Zhang L, Zhou Y, Xiong M, Li Y.   +5 more
europepmc   +1 more source

Imaging Venous Transit Time and Blood–Brain Barrier Permeability of the Deep Brain

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Imaging of venous vessels with advanced pulse sequences allows the assessment of important hemodynamic parameters. Previous work has measured venous transit time (VTT) and blood–brain barrier (BBB) water permeability in cortical tissue.
Wen Shi, Jie Song, Jiani Wu, Yifan Gou, Zhiyi Hu, Vivek Yedavalli, Zixuan Lin, Hanzhang Lu   +7 more
wiley   +1 more source

Consistent Quadratic Phase Formation in 3D Fast Spin Echo Using Frequency‐Modulated RF Pulses

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Frequency‐modulated (FM) RF pulses achieve broadband excitation with low RF peak power, which is required in MRI with inhomogeneous magnetic fields. However, the quadratic phase generated with FM pulses makes it difficult to use them in fast spin echo (FSE), because even and odd refocused echoes have different spatial phase profiles ...
Naoharu Kobayashi, Michael Garwood
wiley   +1 more source

Investigating the Sensitivity of the Diffusion MRI Signal to Magnetization Transfer and Permeability via Monte‐Carlo Simulations

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Magnetization transfer (MT) and water exchange via permeability operate on a similar spatiotemporal scale to water diffusion. In this study, we use a simulation‐based approach to characterize how MT and permeability impact (1) diffusion‐weighted MRI (dMRI) measurements from cylindrical substrates and (2) parameter estimation using a ...
Zhiyu Zheng, Karla L. Miller, Benjamin C. Tendler, Michiel Cottaar   +3 more
wiley   +1 more source

Design of Differential Single‐Block and Multi‐Block Presaturated Ultrashort Echo Time Pulse Sequences for Fast and Flexible Short‐T2 Imaging

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Ultrashort echo time (UTE) techniques are essential for the magnetic resonance imaging of short‐T2 signals. Current UTE techniques are time‐consuming and often require the acquisition of an inflexible volume. In this work, we implement new UTE sequences—differential single‐block presaturated UTE (δSB‐UTE) and differential multi‐block ...
Jason A. Reich, Shannon L. Taylor, Kevin D. Harkins, Rachelle L. Crescenzi, Erin L. MacMillan, Rebecca E. Feldman   +5 more
wiley   +1 more source

The Impact and Reliability of Tissue Segmentation on In Vivo Magnetic Resonance Spectroscopy Metabolite Quantification

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Quantification of metabolite concentrations using MRS requires tissue‐dependent signal corrections. Accurate estimation of voxel tissue composition is therefore essential. Commonly used brain tissue segmentation tools differ in their algorithms and implementation, potentially introducing variability in MRS‐derived concentration ...
Jessica Archibald, Kay Chioma Igwe, Antonia Kaiser, Karl Landheer, Jaimie Lee, John L. K. Kramer, Aaron T. Gudmundson, Helge J. Zöllner, Georg Oeltzschner, Candace C. Fleischer, Niklaus Zölch, Jamie Near, Mark Mikkelsen   +12 more
wiley   +1 more source

Systematic rise in flight cancellations during space weather events. [PDF]

Sci Rep
Luo RD, Wang Y, Wei FS, Feng XS, Bo MH, Tang HW, Wang DS, Bian L, Wang BY, Li Z, Zuo PB, Jiang CW, Xu XJ, Zhou ZL, Tong YX, Gao D, Cao YX, Chen WQ.   +17 more
europepmc   +1 more source

MR Spectroscopy Without Water Suppression Using the Gradient Impulse Response Function

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Non‐water‐suppressed proton spectroscopy, 1H‐MRS, is desirable, as retaining the strong water resonance can facilitate automated online data corrections, internal concentration referencing, and monitoring of line narrowing effects in functional MRS.
James B. Bacon, Peter Jezzard, William T. Clarke   +2 more
wiley   +1 more source

Unified Space-Time-Message Interference Alignment: An End-to-End Learning Approach. [PDF]

Entropy (Basel)
Sadeghabadi E, Blostein S.
europepmc   +1 more source

Polar Coding and Early SIC Decoding for Uplink Heterogeneous NOMA. [PDF]

Entropy (Basel)
Wu CJ, Lin CY, Huang YC.
europepmc   +1 more source