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65 Newest Publications in concepts in magnetic resonance part a
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The variable temperature 1H‐NMR technique for kinetic investigation of equilibrium between the Z‐ and E‐isomers in a especial ylide
29-05-2013 | Sayyed Mostafa Habibi‐Khorassani, Malek Taher Maghsoodlou, Ali Ebrahimi, Sara Sameh‐Salari, Fatemeh Vasheghani‐Farah ..., Concepts in Magnetic Resonance Part A, 2013
A kinetics investigation of the interchangeable process in the equilibrium between the Z‐ and E‐isomers of a stable phosphorus ylide involving a 2‐mercaptobenzoxazol has been undertaken by the variable temperature 1H‐NMR technique. Activation parameters such as k−1, k1, ktotal, Ea1, Ea‐1, ...
Spoiled FLASH MRI with slice selective excitation: Signal equation with a correction term
29-05-2013 | Vincent Gras, Zaheer Abbas, Nadim J. Shah, Concepts in Magnetic Resonance Part A, 2013
ABSTRACT Spoiled fast low‐angle shot (FLASH) magnetic resonance imaging (MRI) provides a simple contrast, largely independent of the spin‐spin relaxation time. Three‐dimensional FLASH imaging (3D FLASH) has gained importance due to its simplicity and its ability to produce isotropic, ...
Emulation of human and rodent cardiac motion with a computer‐controlled cardiac phantom using DENSE MRI
29-05-2013 | C. Constantinides, X. Zhong, V. Tzagkarakis, G. Cofer, R. Gravett, Concepts in Magnetic Resonance Part A, 2013
Abstract In this work, human myocardial motion is studied in an electrical and in an MRI‐compatible (pneumatic) version of a specialized, commercially available, human cardiac phantom at 1.5 Tesla using Displacement Encoding with Stimulated Echoes (DENSE). Work is extended to a prototype ...
Laplace inversion of low‐resolution NMR relaxometry data using sparse representation methods
29-05-2013 | Paula Berman, Ofer Levi, Yisrael Parmet, Michael Saunders, Zeev Wiesman, Concepts in Magnetic Resonance Part A, 2013
ABSTRACT Low‐resolution nuclear magnetic resonance (LR‐NMR) relaxometry is a powerful tool that can be harnessed for characterizing constituents in complex materials. Conversion of the relaxation signal into a continuous distribution of relaxation components is an ill‐posed inverse ...
NMR quadrupole liouvillians for arbitrary spin: Exact symbolic expressions and perturbation solutions
19-03-2013 | Alex D. Bain, Concepts in Magnetic Resonance Part A, 2013
Abstract The NMR of quadrupolar nuclei with half‐integer spins is almost always described by treating the quadrupole interaction with second‐order perturbation theory. The standard practice is to perturb the wave functions, then calculate the transitions. In this article, we elaborate on ...
A pixel is an artifact: On the necessity of zero‐filling in fourier imaging
19-03-2013 | Xiaolu Zhu, Boguslaw Tomanek, Jonathan Sharp, Concepts in Magnetic Resonance Part A, 2013
Abstract MR imaging data is sometimes presented in a “patchwork quilt” format with individual pixels visible as squares of uniform intensity. This phenomenon often arises by default from an image space convolution (performed implicitly by the graphics system) used to convert the sparse ...
The importance of k‐space trajectory on off‐resonance artifact in segmented echo‐planar imaging
19-03-2013 | Jacob A. Bender, Rizwan Ahmad, Orlando P. Simonetti, Concepts in Magnetic Resonance Part A, 2013
Abstract Segmented interleaved echo planar imaging (EPI) is a highly efficient data acquisition technique; however, EPI is sensitive to artifacts from off‐resonance spins. The choice of k‐space trajectories is important in determining how off‐resonance spins contribute to image artifacts. ...
Detection of slow dynamics by solid‐state NMR: Application to L‐phenylalanine hydrochloride
26-02-2013 | Wenbo Li, Ann E. Mcdermott, Concepts in Magnetic Resonance Part A, 2013
Abstract New methods for probing dynamical properties of biological macromolecules on the millisecond timescale will enable a better understanding of the structure–function relationship. In this article, three solid‐state NMR detection methods, line‐shape analysis, two‐dimensional ...
Quantitative prediction of 13C NMR chemical shifts in solvent using PCM‐ONIOM method and optimally selected wave function
26-02-2013 | Hoora Shaghaghi, Fariba Fathi, Hossein Pasha Ebrahimi, Mohsen Tafazzoli, Concepts in Magnetic Resonance Part A, 2013
Abstract The wave functions for calculating 13C nuclear magnetic chemical shifts of 22 groups of organic compounds (64 molecules) in chloroform solution have been optimally selected using factorial design as a multivariate technique. Our own N‐layered integrated molecular orbital and ...
Timing and related artifacts in multidimensional NMR
19-11-2012 | Dominique Marion, Concepts in Magnetic Resonance Part A, 2012
Abstract The information content of multidimensional NMR spectra is limited by the presence of several kinds of artifacts that originate from incorrect timing of evolution periods. The objective of this review is to provide tools for successful implementation of published pulse sequences, ...
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