Results 61 to 70 of about 4,285,560 (201)

Phase Unwrapping for Multiple Interferograms: An Airborne Experiment for TanDEM-X [PDF]

, 2008
This paper describes a joint phase unwrapping approach for multiple interferograms acquired on different trajectories. The work done here was carried out for purposes of TanDEM-X [1] simulations, using the experimental airborne Radar System (E-SAR) of ...
Andres, Christian, Scheiber, Rolf, Hueso-Gonzalez, Jaime, Bachmann, Markus, Krieger, Gerhard   +4 more
core  

Frequency Estimation by Phase Unwrapping [PDF]

, 2010
Single frequency estimation is a long-studied problem with application domains including radar, sonar, telecommunications, astronomy and medicine. One method of estimation, called phase unwrapping, attempts to estimate the frequency by performing linear ...
Clarkson, I. Vaughan L., Rairán Antolines, José Danilo, Quinn, Barry G., McKilliam, Robby G., Moran, Bill   +4 more
core   +1 more source

MR Susceptibility Separation for Quantifying Lesion Paramagnetic and Diamagnetic Evolution in Relapsing–Remitting Multiple Sclerosis

Journal of Magnetic Resonance Imaging, Volume 60, Issue 5, Page 1867-1879, November 2024.
Background Multiple sclerosis (MS) lesion evolution may involve changes in diamagnetic myelin and paramagnetic iron. Conventional quantitative susceptibility mapping (QSM) can provide net susceptibility distribution, but not the discrete paramagnetic and diamagnetic components.
Ziyan Zhu, Nashwan Naji, Javad Hamidi Esfahani, Jeff Snyder, Peter Seres, Derek J. Emery, Michelle Noga, Gregg Blevins, Penelope Smyth, Alan H. Wilman   +9 more
wiley   +1 more source

Itoh-Constrained Hybrid Graph Learning With Sparse Supervision for InSAR Phase Unwrapping

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Phase unwrapping (PU) is a fundamental step in synthetic aperture radar interferometry (InSAR), yet it remains an inherently ill-posed problem due to the $\text{2}\pi$ ambiguity of the interferometric phase.
Jialong Gong, Lifan Zhou, Hanwen Yu, Taoli Yang, Wei Liu, Li Cheng, Hao Liu, Xin Ye, Huanghao Feng, Vito Pascazio   +9 more
doaj   +1 more source

Measurement of the Dispersion of χ(3)$\chi ^{(3)}$ of SiO2${\rm SiO}_2$ and SiN Across the THz and Far‐Infrared Frequency Bands

Laser &Photonics Reviews, Volume 18, Issue 11, November 2024.
Terahertz (THz) radiation sources using two‐color femtosecond plasmas in air are advancing coherent spectroscopy and strong‐field physics. A novel method combining air‐biased coherent detection (ABCD) and solid‐state biased detection (SSBCD) is introduced to measure third‐order nonlinearity in fused silica and silicon nitride.
Binbin Zhou, Mattias Rasmussen, Soheil Zibod, Siqi Yan, Narwan Kabir Noori, Oliver Nagy, Yunhong Ding, Simon Jappe Lange, Ksenia Dolgaleva, Robert W. Boyd, Peter Uhd Jepsen   +10 more
wiley   +1 more source

Unwrapping phase contrast MRI by iterative graph cuts

Magnetic Resonance in Medicine, Volume 92, Issue 4, Page 1484-1495, October 2024.
Abstract Purpose To develop and evaluate a phase unwrapping method for cine phase contrast MRI based on graph cuts. Methods A proposed Iterative Graph Cuts method was evaluated in 10 cardiac patients with two‐dimensional flow quantification which was repeated at low venc settings to provoke wrapping.
Johan Berglund, Mio Liljeblad, Tomasz Baron   +2 more
wiley   +1 more source

PHASE UNWRAPPING CITRA InSAR MENGGUNAKAN PENDEKATAN MINIMISASI ENERGI LOKAL [PDF]

, 2010
Phase Unwrapping InSAR Image Using Local Energy Minimization Approach. Reconstruction process of phasedata from its cover is called Phase Unwrapping (PU).
Andriyan B. Suksmono; Sekolah Teknik Elektro dan Informatika, Institut Teknologi Bandung, Bandung 40132, Indonesia, Kusworo Adi; 1. Sekolah Teknik Elektro dan Informatika, Institut Teknologi Bandung, Bandung 40132, Indonesia. 2. Jurusan Fisika, FMIPA, Universitas Diponegoro, Tembalang, Semarang 50239, Indonesia, Tati L.R. Mengko; Sekolah Teknik Elektro dan Informatika, Institut Teknologi Bandung, Bandung 40132, Indonesia., H. Gunawan; Departemen Matematika, FMIPA, Institut Teknologi Bandung, Bandung 40132, Indonesia.   +3 more
core  

Fourier Decomposition-Based Phase Processing Technique: A Novel Approach for 1-D Phase Unwrapping

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
The performance of coherence analysis system (CAS) is critically dependent on phase accuracy. Most advanced phase unwrapping (PU) algorithms are designed for 2-D problem, but data from various interferometric systems are typically acquired as 1-D time ...
Chenghao Lu, Donglin Li, Hengyi Jia, Taoli Yang   +3 more
doaj   +1 more source

Combined MR quantitative susceptibility mapping and multi‐shell diffusion in Parkinson's disease

Journal of Neuroimaging, Volume 34, Issue 5, Page 603-611, September/October 2024.
Abstract Background and Purpose Quantitative susceptibility mapping (QSM), neurite orientation dispersion and density imaging (NODDI), and the g‐ratio have separately shown differences between Parkinson's disease (PD) and healthy controls. The g‐ratio has, however, not been studied in PD in the substantia nigra (SN) and the putamen.
Oscar Andersson Forsman, Henrik Sjöström, Per Svenningsson, Tobias Granberg   +3 more
wiley   +1 more source

Auxetic Biomedical Metamaterials for Orthopedic Surgery Applications: A Comprehensive Review

Orthopaedic Surgery, Volume 16, Issue 8, Page 1801-1815, August 2024.
Auxetic biomedical metamaterials for joint surgery, spinal surgery, trauma surgery, and sports medicine applications. Poisson's ratio in auxetic materials shifts from typically positive to negative, causing lateral expansion during axial tension. This scale‐independent characteristic, originating from tailored architectures, exhibits specific physical ...
Minghao Sun, Xin Hu, Leilei Tian, Xiao Yang, Li Min   +4 more
wiley   +1 more source