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Ghost peaks simulation and reduction in high-resolution echo-planar spectroscopic imaging with flyback readout [PDF]

Scientific Reports
The undesirable aspect of echo-planar spectroscopic imaging (EPSI) is the occurrence of Nyquist ghost spectral lines. This phenomenon reduces the intensity of each true spectral line due to energy transfer into one or more ghost peaks.
Jan Weis, Magor Babos, Ram Kumar Selvaraju   +2 more
doaj   +3 more sources

Assessment of spectral ghost artifacts in echo-planar spectroscopic micro-imaging with flyback readout [PDF]

Scientific Reports
In this work, echo-planar spectroscopic imaging (EPSI) with flyback readout gradient-echo train was implemented in a preclinical MR scanner. The aim of this study is to visualize and quantify the ghost spectral lines produced by two, three and four ...
Jan Weis, Magor Babos, Sergio Estrada, Ram Kumar Selvaraju   +3 more
doaj   +5 more sources

Enhancement of ice-phase precipitation caused by thermal forcing produces ghost echoes over the Tibetan Plateau [PDF]

npj Climate and Atmospheric Science, 2021
Whether tall storms produce heavy precipitation is currently a controversial topic. Here, we used seven years of observations from the dual-frequency precipitation radar and found that there is a rare but unique vertical precipitation structure over the ...
Yilun Chen, Aoqi Zhang, Shumin Chen, Chaoyong Tu, Weibiao Li, Yunfei Fu   +5 more
doaj   +2 more sources

Analysis of 70° Ghost Echo of Bolt Hole in High-speed Rail Flaw Detection Ultrasonic Examination

机车电传动, 2021
In the detection process of high-speed rail flaw by ultrasonic flaw, there are some abnormal echoes in rail head near the bolt holes in B scan sometimes, however, they are not echoes from defects but ghost echoes actually.
Pin WANG, Jingwei CAO, Hongliang LI, Lang XIA   +3 more
doaj   +1 more source

A robust self-referenced 2D nyquist ghost correction for different MRI-biomarker measurements based on multi-band interleaved EPI

Frontiers in Physics, 2023
Purpose: To enable 2D Nyquist ghost correction for multi-band interleaved echo-planar imaging (EPI) without reference scan.Methods: 2D phase errors between positive and negative echo were directly measured from the multi-band interleaved EPI data ...
Xiaoxi Liu, Xiaoxi Liu, Shihui Chen, Di Cui, Edward S. Hui, Edward S. Hui, Edward S. Hui, Queenie Chan, Nan-Kuei Chen, Nan-Kuei Chen, Hing-Chiu Chang, Hing-Chiu Chang   +11 more
doaj   +1 more source

Estimation of High-Frequency Vibration Parameters for Airborne Terahertz SAR Using Chirplet Decomposition and LS Sequential Estimators

Remote Sensing, 2022
Due to the short wavelength of the terahertz wave, airborne terahertz synthetic aperture radar (THz-SAR) suffers from echo phase errors caused by the high-frequency vibration of the platform.
Zhaoxin Hao, Jinping Sun, Qing Li, Tao Shan   +3 more
doaj   +1 more source

Single‐shot echo‐planar imaging with Nyquist ghost compensation: Interleaved dual echo with acceleration (IDEA) echo‐planar imaging (EPI) [PDF]

Magnetic Resonance in Medicine, 2012
AbstractEcho planar imaging (EPI) is most commonly used for blood oxygen level‐dependent fMRI, owing to its sensitivity and acquisition speed. A major problem with EPI is Nyquist (N/2) ghosting, most notably at high field. EPI data are acquired under an oscillating readout gradient and hence vulnerable to gradient imperfections such as eddy current ...
Poser B.A., Barth M., Goa P.-E., Deng W., Stenger V.A.   +4 more
openaire   +3 more sources

Improved Row-Column-Addressed Array Imaging by Leveraging Ghost Echoes

2023 IEEE International Ultrasonics Symposium (IUS), 2023
Among various choices of 2-D ultrasound transducer arrays, the row-column-addressed (RCA) 2-D array has shown its promise for 3-D imaging. However, RCA suffers from notable edge effects and thus receives ghost echoes, which result in ghost artifacts showing in the volumetric image.
Mei, Chung-Shiang, Li, Meng-Lin
openaire   +2 more sources

Interpretation Peculiarities of the Sleeping Beauty Motif in D.H. Lawrence`s Short Story “Princess” [PDF]

Вісник університету ім. А. Нобеля. Серія Філологічні науки, 2021
The reception of D.H. Lawrence`s works in Western and Ukrainian literary criticism is reflected in detail in Natalia Styrnik`s thesis. She concluded that Lawrence`s short stories remain underexplored in modern Ukrainian literary criticism.
Lyudmyla M. Kulakevych
doaj   +1 more source

THE POSTMODERN CITY TEXT IN SERHIY ZHADAN’S POETICS [PDF]

Вісник університету ім. А. Нобеля. Серія Філологічні науки, 2023
The article explores the display mechanisms of the postmodern city as a text in Serhiy Zhadan’s works during the period between 2008 up to 2022. We’ve investigated the city representation tools portrayed in the diachronic aspect.
Tetiana M. Starostenko. , Ianina V. Gurtova   +1 more
doaj   +1 more source