Results 251 to 260 of about 2,170 (281)
Some of the next articles are maybe not open access.
Ghosts in the Consulting Room: Echoes of Trauma in Psychoanalysis
Transactional Analysis Journal, 2018“What is it, then, that determines whether the conflicted past of the parent will be repeated with his child?” (Fraiberg, Adelson, & Shapiro, 1975, p. 419).
openaire +1 more source
Ghost artifact on gradient-echo imaging: a potential pitfall in hepatic imaging.
American Journal of Roentgenology, 1990Standard evaluation of the liver with MR uses spin-echo imaging with Tiand T2-weighted pulse sequences [1]. A short inversion-time inversion recovery (STIR) sequence has been used as an adjunct to standard pulse sequences because it provides certain advantages, including fat suppression, additive effects of Ti and T2 relaxation on tissue brightening ...
P M, Silverman +3 more
openaire +2 more sources
ISMRM Annual Meeting, 2023
We propose a new correction scheme using a deep neural network with unsupervised learning to correct Nyquist ghosts and geometry distortions occurring in EPI. The proposed scheme includes NGAC-net and GDC-net. First, the NGAC-net estimates the phase error of k-space with the help of a ghost formulation operator and correlation loss.
Jeewon Kim +5 more
openaire +1 more source
We propose a new correction scheme using a deep neural network with unsupervised learning to correct Nyquist ghosts and geometry distortions occurring in EPI. The proposed scheme includes NGAC-net and GDC-net. First, the NGAC-net estimates the phase error of k-space with the help of a ghost formulation operator and correlation loss.
Jeewon Kim +5 more
openaire +1 more source
Reference-free Correction for the Nyquist Ghost in Echo-planar Imaging using Deep Learning
Proceedings of the 2019 6th International Conference on Biomedical and Bioinformatics Engineering, 2019Echo-planar imaging suffers from Nyquist ghost (i.e., N/2 ghost) because of the imperfection of the gradient system and gradient delays. The phase mismatch between even and odd echoes can be eliminated by an extra reference scan without the phase encoding.
Xudong Chen +3 more
openaire +1 more source
Reduction of phase error ghosting artifacts in thin slice fast spin‐echo imaging
Magnetic Resonance in Medicine, 1995AbstractFast spin‐echo (FSE) imaging techniques are very sensitive to the relative phase between the 90° (excitation) RF pulse and the 180° (refocusing) RF pulses. In this paper, it is demonstrated that a phase shift can be created between the excitation and refocusing pulses in such a manner that the received signal is divided into two components of ...
X, Wan +4 more
openaire +2 more sources
Acoustic Spectrum and Ghosting in EPI: Timing is Everything (and it is Not Just Echo Spacing)
ISMRM Annual MeetingMotivation: Gradient echo-trains in EPI cause mechanical vibration, loud sounds, ghosting artifacts, and even mechanical failure. A better understanding of the vibration modes can help mitigate ghosting and/or disturbing sounds. Goal(s): Modeling acoustic spectrum for a given gradient-waveform can predict the acoustic modes. Approach: A simple model of
Amir Seginer, Rita Schmidt
openaire +1 more source
Echo-planar spectroscopic imaging with flyback readout: ghost peaks and micro-imaging
ISMRM Annual MeetingMotivation: To assess echo-planar spectroscopic imaging (EPSI) with flyback readout gradients in preclinical MR system. Goal(s): To demonstrate spectral ghost artifacts produced by two, three, and four interleaved gradient echo trains and to measure water, fat, and water-fat shift artifacts free images.
Jan Weis +3 more
openaire +1 more source
Utilization of Ghost Reflections by Echo-deblending
78th EAGE Conference and Exhibition 2016, 2016A.J. Berkhout, G. Blacquiere
openaire +1 more source
Haunted by the Ghosts of Pickett’s Charge: Echoes of the Civil War in Two Novels by Vietnam Veterans
Southern Cultures, 2015[ILLUSTRATION OMITTED] In Vietnam and the Southern Imagination, Owen W. Gilman Jr. writes that "Southerners have an affinity for history, and thus Vietnam has been joined frequently to the long span of history cultivated in the South." One of the more vocal critics of the American war in Vietnam, Arkansas Senator J. William Fulbright, directly connects
openaire +1 more source
3D Dual-Polarity GRAPPA for Ghost Correction of Volumetric Echo-Planar Imaging Data
ISMRM Annual MeetingMotivation: 3D-EPI suffers from inherent sampling errors, similar to conventional 2D-EPI, which result in Nyquist ghosting and shading artifacts that arise from non-linear phase errors in the sampled data. Goal(s): To demonstrate that the Dual-Polarity GRAPPA (DPG) reconstruction method can be extended and applied effectively to 3D-EPI data.
W. Hoge +4 more
openaire +1 more source