Results 71 to 80 of about 13,919 (263)
Φ-OTDR Based on Undersampling Heterodyne Detection
Applied SciencesWe demonstrate a distributed acoustic sensing (DAS) system based on phase-sensitive optical time-domain reflectometry (Φ-OTDR) that employs I/Q demodulation and heterodyne detection.
Jiaxiang Feng, Dandan Zhang, Yuan Mao
doaj +1 more source
Cartesian MPnRAGE for Efficient Simultaneous Multi‐Contrast and Quantitative Relaxometry Imaging
Magnetic Resonance in Medicine, EarlyView.ABSTRACT Purpose T1‐weighted images with different weighting and T1 quantification can be useful in the differentiation of both native and pathologic tissue; however, acquiring multiple images requires substantial time. A rapid and robust brain imaging sequence was developed to simultaneously provide quantitative T1 maps and multiple T1‐weighted images.
Carly A. Allen +5 more
wiley +1 more source
Magnetic Resonance in Medicine, EarlyView.ABSTRACT Purpose To present a novel, nonlinear subspace modeling and joint k–q‐space reconstruction technique for high‐resolution, multi‐band, multi‐shell diffusion‐weighted imaging (DWI). Methods High b‐value (> 1000 s/mm2), high resolution DWI has the drawback of generally low signal‐to‐noise ratios (SNRs).
Julius Glaser +4 more
wiley +1 more source
Dianxin kexueThe imbalanced classification problem is one of the common challenges in machine learning and widely exists in practical applications such as network traffic recognition.
HE Hongshun +4 more
doaj +2 more sources
Citation: 'undersampling' in the IUPAC Compendium of Chemical Terminology, 5th ed.; International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.08297 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms. Requests for
openaire +1 more source
Magnetic Resonance in Medicine, EarlyView.ABSTRACT Purpose Magnetic Resonance Fingerprinting (MRF) enables rapid quantitative imaging, but high‐resolution 3D reconstructions remain computationally expensive due to the NUFFTs required at every iteration, and the commonly used Locally Low Rank (LLR) regularization becomes ineffective at high acceleration.
Yonatan Urman +4 more
wiley +1 more source
Magnetic Resonance in Medicine, EarlyView.ABSTRACT Purpose To develop a balanced SSFP (bSSFP) sequence for pulmonary 129Xe dissolved‐phase imaging based on a previously described double‐echo sequence facilitating separation into red blood cell and membrane signals, to test its feasibility and compare its SNR performance and imaging results to an analogous FLASH sequence.
Agilo L. Kern +4 more
wiley +1 more source
Applied SciencesCrash data analysis is key to improving road safety, but imbalanced data challenges accurate predictions for severe crashes, often leading to biased outcomes. This study investigates crash severity among young drivers (aged 17–24) in England, using crash
Amirhossein Taheri +5 more
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The Influence of Radial Undersampling Schemes on Compressed Sensing in Cardiac DTI
Sensors, 2018 Diffusion tensor imaging (DTI) is known to suffer from long acquisition time, which greatly limits its practical and clinical use. Undersampling of k-space data provides an effective way to reduce the amount of data to acquire while maintaining image ...
Jianping Huang +3 more
doaj +1 more source
Magnetic Resonance in Medicine, EarlyView.ABSTRACT Purpose To develop and evaluate an automated clinical prototype for a 1‐min free‐breathing T1‐weighted 3D MRI and a 2.25‐min 4D MRI utilizing radial k‐space acquisition and deep learning (DL) auto‐navigation and reconstruction. Methods The clinical prototype was deployed on 3 T GE Healthcare scanners, using the GE DISCO‐Star (radial golden ...
Victor Murray +8 more
wiley +1 more source