Crusher Gradient Reversal to Eliminate Stimulated Echo ...
The crusher gradient reversal method allows the diffusion gradients and the crusher gradients to be added up, and kills the stimulated echo signal universally and not specific to some certain b-values.
Tracking the effects of crusher gradients on gradient-echo ...
A unique method to map the effect of crusher gradients in space and time on the gradient echo BOLD signal is introduced. Using the R adial C orrelation C ontrast ( RCC ) analysis method, amplitude-RCC maps at different time segments and different gradient strengths were obtained.
Correction Gradients - 81Bones.net
• Crusher Gradients: is a correction gradient that preserves the desired signal pathways while eliminating unwanted ones by manipulating the phase of the signals. • Consists of two lobes with the same polarity immediately before and after the refocusing RF pulse with the same or different areas. • The crusher gradients are used to manipulate the phase
Simultaneous optimization of crusher and phase cycling ...
1. Magn Reson Med. 2020 Feb;83(2):391-402. doi: 10.1002/mrm.27952. Epub 2019 Sep 17. Simultaneous optimization of crusher and phase cycling schemes for magnetic resonance spectroscopy: an extension of dephasing optimization through coherence order pathway selection.
Dephasing - an overview | ScienceDirect Topics
Crusher gradients eliminate the unwanted signals by introducing intravoxel dephasing. For a given crusher gradient area, the extent of signal dephasing is directly proportional to the voxel size along the crusher gradient direction, as implied by Eqs. (10.24) and (10.25). Although crusher gradients can be applied along any direction, in practice they are most commonly employed on the slice-selection axis, …
usa resonance crusher - apemonaco.org
portable rock crushers and grinders,coal crusher vibration isolator,grinders must as the random frequencies generated by crushing can cause resonance in 5 NOISE SOURCES operations and equipment including crushing, riveting, blasting (quarries and mines), (EPA)/USA report in 1981, there are more than nine million Americans exposed . at resonance frequencies and/or blocking the …
crusher-plant-resonance
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Pulsed field gradient - Wikipedia
A pulsed field gradient is a short, timed pulse with spatial-dependent field intensity. Any gradient is identified by four characteristics: axis, strength, shape and duration. Pulsed field gradient (PFG) techniques are key to magnetic resonance imaging, spatially selective spectroscopy and studies of diffusion via diffusion ordered nuclear magnetic resonance spectroscopy (DOSY).
Correction for vascular artifacts in cerebral blood flow ...
crusher gradient was set to zero, and a “fat saturation” pulse, consisting of a 16-ms nonselective sinc pulse fol- lowed by gradient spoiler pulses, was added to the se- quence. The z gradient was not turned on during the irradia- tion. In the absence of a z gradient, the off-resonance RF
Optimal control of the signal-to-noise ratio per unit time ...
We focus on two specific issues relevant in nuclear magnetic resonance, the crusher gradient and the radiation damping cases. Optimal control techniques are used to solve this non-standard control problem. We discuss the optimality of the Ernst angle solution, which is commonly applied in spectroscopic and medical imaging applications.
Slice profile optimization in arterial spin labeling using ...
presat crusher gradient area from 30 to 55 mT/md ms. The second presat pulse had a fixed crusher gradient area of 41.41 mT/md ms, while the inversion crusher area was 82.82 mT/md ms.
Reducing localized signal fluctuation in fMRI using ...
Apr 24, 2012 · A crusher gradient is then applied to spatially disperse the phase of the rotated fat spins, making their net transverse magnetization in a given imaging voxel vanish.
4239 - Mira Smart Conferencing
A critical portion of an in vivo magnetic resonance spectroscopic (MRS) ... PRESS 5 and STEAM 6 (which included RF pulses, slice-select gradients, crusher gradients and timings identical to nominal experimental parameters), with echo times (TE) of 30 and 20 ms, respectively, for the metabolite gamma-aminobutyric acid (GABA).
1288 - Mira Smart Conferencing
In a magnetic resonance spectroscopy (MRS) pulse sequence a scheme of pulsed magnetic field gradient "crushers" are played out during times in-between radiofrequency (RF) pulses to dephase unwanted coherence pathways which are incidentally perturbed by the RF pulses.
An analysis of the intrinsic resonance offset dependence ...
It is demonstrated that the basic radiofrequency pulse train used to generate stimulated echoes (90 x-τ TE-90 x-τ TM-90 x-τ TE-Acq.) is in general characterized by strong amplitude and phase modulations of the transverse magnetization as a function of the resonance offset.Two dephasing techniques which eliminate the modulations are investigated both theoretically and experimentally, and a ...
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US Patent for Method and magnetic resonance apparatus ...
In a method and apparatus for acquiring magnetic resonance (MR) data from multiple slices of a subject, a spin echo sequence is executed wherein a radio frequency (RF) excitation pulse, a refocusing pulse, and a further RF pulse are radiated, together with the application of a number of gradients, in order to acquire MR data from an intersection volume of a selected slice with a further slice.
resonant pavement crusher
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Ultrafast diffusion exchange nuclear magnetic resonance ...
Jun 26, 2020 · Nuclear magnetic resonance ... frequency selective pulses along with gradients have been exploited in the ... C, SD, DD, and RD of G stand for diffusion, crusher…