The joint action of two feedback fields in solution magnetic resonance mr, radiation damping and the distant dipolar field, are known to give rise to nonlinear evolution of the magnetization at high fields.The different stages of the resulting complex dynamics are explored here, and standard tools and terminology adopted from the theory of nonlinear dynamics are introduced to analyze the.
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Water t 1 measurements were performed by the saturation recovery method to avoid radiation-damping problems.Three 90-crusher gradient pairs were used before the readout 90 pulse to remove transverse bulk magnetization.The three crusher gradients of 1-ms duration were performed with 0.
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Optimal control of the signal-to-noise ratio per unit time of a spin 12 particle the crusher gradient and the radiation damping cases m.Sugny, journal j.- n 142 - 2015 - 044202.
Gradient ascent pulse engineering for rapid exchange saturation transfer 201 g.Optimal control of the signal-to-noise ratio per unit time of a spin 12 particle the crusher gradient and the radiation damping cases 200 m.
2015 optimal control of the signal-to-noise ratio per unit time of a spin 12 particle the crusher gradient and the radiation damping cases.The journal of chemical physics 1424, 044202.2014 the round-trip contrast problem.53rd ieee conference on decision and control, 5788-5793.
A strong crusher gradient was applied after the t fb period to eliminate any residual net transverse magnetization.After this fixed 50ms saturation preparation period, the longitudinal magnetization was read out using a 30 slice-selective pulse and gradient echo readout.After 3 s, the sequence was repeated to obtain a 64 64 image.
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The accelerated radiation damping for increased spin equilibrium arise method uses an external feedback circuit to strengthen the radiation damping rd field.The enhanced rd field rotates the magnetization back to the zaxis at a rate faster than t 1 relaxation.The method is characterized in gre phantom imaging at 3t as a function of.
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A method and system to enhance mri contrast based on nonlinear feedback fields induced by the spin of the imaged molecules are provided.It is shown that while contrast in magnetic resonance imaging mri is often limited by the dependence of the magnetization on mr parameters that may not vary significantly throughout the sample, through use of the inventive system, changes in the.
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Gradient ascent pulse engineering for rapid exchange saturation transfer 193 g.Optimal control of the signal-to-noise ratio per unit time of a spin 12 particle the crusher gradient and the radiation damping cases 192.
Crusher gradient and the radiation damping cases.Case of unbounded control fields which also includes finite-.Of quality q is the figure of merit to maximize.Get price and support online basalt sand in cement - feldspar crusher sales - xsm.
Lapert, m, assmat, e, glaser, sj, sugny, d optimal control of the signal-to-noise ratio per unit time of a spin 12 particle the crusher gradient and the radiation damping cases.142, 04420219 2015.Article google scholar.
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The dante pulse was replaced with a 2 ms sinc-shaped -pulse phase x, x to invert the magnetization of the bulk water signal, followed by a 500 s, 24 gcm field gradient and a low level crusher gradient 0.1 gcm during the variable delay time, effectively eliminating any radiation damping.
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Spin chaos in magnetic resonance spin chaos in magnetic resonance lin, yung-ya lisitza, natalia 000000 abstract the joint action of two readily observed effects in solution magnetic resonance radiation damping and the dipolar field are shown to generate spatiotemporal chaos in routine experiments.The extreme sensitivity of the chaotic spin dynamics to experimental conditions.
Radiation damping was probed by acquiring n115 sequential pulse-acquire data acquisitions each one followed by spoiling of the transverse magnetization with a large crusher gradient 20 mtm1 for 10 ms.The signal in the pre-amp was attenuated by 18 db to avoid saturation or compression and possible clipping of the large.
Optimal control of the signal-to-noise ratio per unit time of a spin 12 particle the crusher gradient and the radiation damping cases m.Sugny read more with low noise level crusher - cz-eu.
In the presence of radiation damping, fair is subject to errors in perfusion quantification.In this fairer technique, the effect of radiation damping is suppressed by employing a very weak gradient e.6 mtm during the delays e., the inversion delay and spin echo delays in the pulse sequence.
Tionsradiation damping and the dipolar fieldcombine to generate chaotic dynamics even with extraordinarily simple sequences.Consider the simplest pulsegradient combi-nation p2 x gt z an rf pulse along the x axis with a flip angle of p2 followed by a crusher b 0 gradient in the z direction with strength g and duration.