Explicit phenomenological solutions for magnetization exposed to an arbitrary NMR diffusion steady state pulse sequence

2021 ◽  
Vol 155 (14) ◽  
pp. 144204
Author(s):  
Anthony M. Lee ◽  
Timothy Stait-Gardner ◽  
William S. Price
Keyword(s):  
Steady State ◽  
Pulse Sequence ◽  
Nmr Diffusion

scholarly journals Twofold improved tumor-to-brain contrast using a novel T1 relaxation-enhanced steady-state (T1RESS) MRI technique

2020 ◽  
Vol 6 (44) ◽  
pp. eabd1635
Author(s):  
R. Edelman ◽  
N. Leloudas ◽  
J. Pang ◽  
J. Bailes ◽  
R. Merrell ◽  
...  
Keyword(s):  
Steady State ◽  
Cancer Detection ◽  
Pulse Sequence ◽  
Signal To Noise Ratio ◽  
Cancer Imaging ◽  
Dark Blood ◽  
T1 Relaxation ◽  
Contrast Enhanced ◽  
Magnetic Resonance Imaging Mri ◽  
Standard Techniques

A technique that provides more accurate cancer detection would be of great value. Toward this end, we developed T1 relaxation-enhanced steady-state (T1RESS), a novel magnetic resonance imaging (MRI) pulse sequence that enables the flexible modulation of T1 weighting and provides the unique feature that intravascular signals can be toggled on and off in contrast-enhanced scans. T1RESS makes it possible to effectively use an MRI technique with improved signal-to-noise ratio efficiency for cancer imaging. In a proof-of-concept study, “dark blood” unbalanced T1RESS provided a twofold improvement in tumor-to-brain contrast compared with standard techniques, whereas balanced T1RESS greatly enhanced vascular detail. In conclusion, T1RESS represents a new MRI technique with substantial potential value for cancer imaging, along with a broad range of other clinical applications.

scholarly journals Quasi-steady-state air plasma channel produced by a femtosecond laser pulse sequence

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Xin Lu ◽  
Shi-You Chen ◽  
Jing-Long Ma ◽  
Lei Hou ◽  
Guo-Qian Liao ◽  
...  
Keyword(s):  
Steady State ◽  
Laser Pulse ◽  
Femtosecond Laser ◽  
Femtosecond Laser Pulse ◽  
Plasma Channel ◽  
Pulse Sequence ◽  
Quasi Steady State ◽  
Air Plasma

Application of a steady-state pulse sequence for solvent elimination in 17O NMR

1983 ◽  
Vol 51 (1) ◽  
pp. 153-156 ◽  
Author(s):  
Jürgen Lauterwein ◽  
Ioannis P Gerothanassis
Keyword(s):  
Steady State ◽  
Pulse Sequence ◽  
17O Nmr

In-Situ NMR Study of Dislocation Jump Distance During Creep of Pure and Doped NACL Single Crystals

1988 ◽  
Vol 142 ◽  
Author(s):  
K. Linga Murty ◽  
O. Kanert
Keyword(s):  
Steady State ◽  
Single Crystals ◽  
Pulse Sequence ◽  
Subgrain Size ◽  
Steady State Creep ◽  
Spin Lattice Relaxation ◽  
Relaxation Rates ◽  
Nmr Study ◽  
Jump Distance

AbstractNuclear magnetic resonance pulse techniques are used in-situ during creep of single crystals of NaCl to evaluate the contribution of mobile dislocations to spin relaxation. 23Na spin-lattice relaxation rates were measured in the rotating frame (T1ρ) during compression creep of single crystals of NaCl along [110] direction at 473K at an applied stress of 20 MPa. The relaxation rates are evaluated from the spin-echo height following π/2, locking and 67° pulse sequence. The height of the free induction decay decreased as soon as the load is applied followed by a gradual increase until the steady-state is reached, at which point a saturation value is observed corresponding to the constant steady-state creep-rate. The mean jump distance of the mobile dislocations, evaluated from the ratio of the signal heights without deformation and during creep, decreased with time/strain reaching a constant value during steady-state creep regime. The results are compared with the dislocation-dislocation spacing, subgrain size as well as the jump distance predicted from creep models. The effects of dilvalent Ca and solid solution with LiCl are examined.

The Frequency Offset Effects of NQR of Spin I = 1 for Remote Detection

2002 ◽  
Vol 57 (6-7) ◽  
pp. 297-303 ◽  
Author(s):  
G. V. Mozjoukhine
Keyword(s):  
Steady State ◽  
Pulse Sequence ◽  
Pulse Sequences ◽  
Frequency Offset ◽  
Remote Detection ◽  
Signal Interference ◽  
Experimental Investigations ◽  
Tensor Method ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

The frequency offset effects of the signal interference during steady-state pulse sequences for remote nuclear quadrupole resonance (NQR) of 14N nuclei were investigated for the purposes of optimization in remote NQR. The experimental investigations with the separation of interfering NQR signals in sequences for observing signals {α0° |β90° −τ−α180° |β90° −τ} and {α0° |β90° −τ−α0° |β270° −τ} were carried out. The applications of the spherical tensor method for pure NQR of spin I = 1 for the investigation of these sequences and one pulse sequence, two pulse sequences are presented, too.

Steady state effects in PGSE NMR diffusion experiments

2008 ◽  
Vol 462 (4-6) ◽  
pp. 331-336 ◽  
Author(s):  
Tim Stait-Gardner ◽  
P.G. Anil Kumar ◽  
William S. Price
Keyword(s):  
Steady State ◽  
Nmr Diffusion ◽  
Pgse Nmr

Experimental Investigations of the Strong Off-Resonant Comb (SORC) Pulse Sequence in 14N NQR

1992 ◽  
Vol 47 (1-2) ◽  
pp. 415-420 ◽  
Author(s):  
S. S. Kim ◽  
J. R. P. Jayakody ◽  
R. A. Marino
Keyword(s):  
Steady State ◽  
Pulse Sequence ◽  
Frequency Offset ◽  
Experimental Investigations ◽  
Quasi Steady State ◽  
Signal Averaging ◽  
Pulse Parameters ◽  
Free Induction ◽  
Signal Response

AbstractThe behavior of induction signals during steady-state pulse irradiations in 14N NQR was investigated experimentally. It has long been known that the signal response to a long sequence of η pulses will dramatically increase for pulse spacings less than T2. This increase is exponential, and can result in signals comparable to optimally prepared Free Induction Decays. Because these "SORC" signals recur as long as the pulsing continues, very efficient signal-averaging can result. The dependence of these quasi steady-state signals on pulse parameters and on frequency offset are presented, together with a discussion of the applicability of the method.

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