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Tracking the effects of crusher gradients on …
Abstract A unique method to map the effect of crusher gradients in space and time on the gradient echo blood oxygen level dependent (BOLD) signal is introduced. Using the Radial Correlation Contras...
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Orthogonalizing crusher and diffusion‐encoding gradients . Feb 01, 2014 · Read "Orthogonalizing crusher and diffusion‐encoding gradients to suppress undesired echo pathways in the twice‐refocused spin echo diffusion sequence, Magnetic Resonance in Medicine" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your ...
Orthogonalizing crusher and diffusion‐encoding …
Static crusher gradients were implemented on all three axes and set to provide 8π and 4π phase dispersion around the first and second refocusing RF pulses, respectively. The orthogonal crushers were implemented as described in the THEORY section and provided …
Tracking the effects of crusher gradients on …
A unique method to map the effect of crusher gradients in space and time on the gradient echo BOLD signal is introduced. Using the Radial Correlation Contrast (RCC) analysis method, amplitude-RCC maps at different time segments and different gradient strengths were obtained. The ratio of amplitude-RCC cluster volumes, with and without crusher gradients, showed a temporal dependency with ...
Crusher Gradient Reversal to Eliminate Stimulated Echo ...
Crusher Gradient Reversal to Eliminate Stimulated Echo Artifacts in Dual Spin Echo Diffusion MRI G. Wu1, S. Lee1, X. Zhao1, and Z. Li1 1GE Healthcare, Waukesha, WI, United States Introduction The dual spin echo (DSE) technique is to reduce eddy-curre nt-induced distortion in diffusion MRI by applying two refocusing RF pulses after the excitation RF pulse
Correction Gradients - 81Bones.net
Crusher Gradients • 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 …
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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
RARE - warwick.ac.uk
RARE-type sequences begin in the same way as the well known spin-echo sequence, with a π pulse used to refocus dephasing spins into an echo. In RARE multiple π pulses are used to create many echoes. By applying a different phase encoding gradient to each echo multiple k-space lines can be collected in one go.
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These are dehydrator, filling machine, pulper, crusher, and boiler. stone crusher sanbo 250 400, 1H Magnetic Resonance Spectroscopy of γ-Aminobutyric Acid - ORCA. Apr 22, 2016 . the water resonance, each of which are followed by a crusher gradient to dephase all .. 2014; Rodriguez et al., 2015; Stone et al., 2012; Valentine et al., 2011). Read ...
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american resonance crusher . resonance crusher road machine Bearing (mechanical) - Wikipedia. A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts.The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation .
JP2005512648A - Diffusion-weighted multiple …
For example, magnetic resonance imaging using a pulse sequence to generate a magnetic resonance signal applying diffusion weighting with a set of gradient pulses separated by 180 ° refocusing RF pulses. The magnetic resonance signal is generated as a spin echo by the refocusing pulse. The refocusing pulse is next to the correction gradient pulse, and the gradient intensity of the correction ...
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US20050001616A1 - Diffusion weighted multiple …
A magnetic resonance imaging method which involves a pulse sequence for generating magnetic resonance signals and in which diffusion weighting is applied, for example, by way of a pair of gradient pulses which are separated by a 180° refocusing RF pulse. The magnetic resonance signals are generated as spin echo signals due to refocusing pulses.
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Spoiling - Questions and Answers in MRI
Gradient spoiling. In this method spoiling is performed by applying the slice-select (and sometimes readout) gradients with variable amplitudes at the end of each cycle just before the next RF pulse. The strength of the spoiler gradient is varied linearly or semi-randomly from view to view.