PatentDOI
Adiabatic pulses for wideband inversion and broadband decoupling
TLDR
In this article, an inversion pulse for wideband application is obtained from a simple nonlinear amplitude modulation wherein the amplitude is modulated in accord with A(t)=A 0 {1-| sin βt| n } and the entire pulse is frequency modulated such that the phase varies as φ(t) =φ 0 + 1/2 kt 2About:
This article is published in Journal of Magnetic Resonance, Series A.The article was published on 1996-07-26. It has received 538 citations till now. The article focuses on the topics: Amplitude modulation & Amplitude.read more
Citations
More filters
Journal ArticleDOI
ECLIPSE utilizing gradient-modulated offset-independent adiabaticity (GOIA) pulses for highly selective human brain proton MRSI.
Chathura Kumaragamage,Henk M. De Feyter,Peter B. Brown,Scott McIntyre,Terence W. Nixon,Robin A. de Graaf +5 more
TL;DR: The low RF power deposition demonstrates that GOIA‐ECLIPSE is very well suited for high field (≥3 T) MRSI applications, and the highly robust lipid suppression combined with low CSD and sharp ROI edge transitions make GOIA'S ECLIPSE an attractive alternative to commonly employed lipid suppression methods.
Dissertation
Résonance magnétique nucléaire du soufre-33 : application à la caractérisation des élastomères vulcanisés
TL;DR: In this paper, the authors present an analysis of the effect of using a Resonance Magnetique Nucleaire (RMN) on the environnements of chimiques du soufre.
Journal ArticleDOI
Concentration of Gallbladder Phosphatidylcholine in Cholangiopathies: A Phosphorus-31 Magnetic Resonance Spectroscopy Pilot Study.
Lorenz Pfleger,Emina Halilbasic,Martin Gajdošík,Martin Gajdošík,Diana Benčíková,Marek Chmelik,Marek Chmelik,Thomas Scherer,Siegfried Trattnig,Michael Krebs,Michael Trauner,Martin Krššák +11 more
TL;DR: In this paper, a 3D phase-encoded pulse-acquire 31 P-MRSI sequence was used for quantification of PtdC in the human gallbladder at 7 T.
Journal ArticleDOI
A new RF tagging pulse based on the Frank poly-phase perfect sequence.
Christoffer Laustsen,Marcus Greferath,Steffen Ringgaard,Niels Chr. Nielsen,Jan Henrik Ardenkjær-Larsen +4 more
TL;DR: A new phase-modulation-only RF pulse for RF tagging based on the Frank poly-phase perfect sequence is demonstrated and an extended version with a WURST modulation (Frank-WURST) is introduced.
Journal ArticleDOI
Improving MRI's slice selectivity in the presence of strong, metal-derived inhomogeneities.
TL;DR: A series of novel approaches were introduced to select slices near metals, delivering robustness against Bo and B1+ field inhomogeneities, and at the expense of higher SAR than non-swept counterparts.
References
More filters
PatentDOI
Methods of, and apparatus for, proton decoupling in nuclear magnetic resonance spectroscopy
TL;DR: In this paper, a radio-frequency pulse is tuned to the frequency of the nuclear species, such as 1 H, to be decoupled or saturated and has a bandwidth adjusted to correspond to the entire chemical shift spectrum, minimizing the amount of radiofrequency power transmitted into a volume of the irradiated sample.
Patent
RF pulse cascade for the generation of NMR spectra
TL;DR: In this article, a method for generating a spectrum of NMR signals with rectangular characteristic in the frequency space by radiating a sequence of RF pulses onto a sample in the homogeneous magnetic field is presented.
PatentDOI
Method and apparatus for broadband decoupling in nuclear magnetic resonance with chirp pulses
Riqiang Fu,Geoffrey Bodenhausen +1 more
TL;DR: In this article, the authors proposed a method for broadband decoupling in nuclear magnetic resonance with chirp and other RF pulses, where the sample is placed in a static field, and a first cycle of chirps pulses are generated, followed by a second cycle of pulses generated by a supercycle of the first and second cycles.
Patent
Method for exciting transverse magnetization in magnetic resonance
TL;DR: In this article, a method for exciting transverse magnetization by irradiating a nuclear spin system subjected to a constant magnetic field with a frequency-modulated rf-pulse ("chirp"-pulse) and with a further frequency-modified rfpulse (further chirppulse), for refocusing the magnetization, is characterized in that the rf pulse-(P1) and the further pulse (P2) overlap each other in time at least partially.
PatentDOI
Method for determining optimized radio-frequency pulse shapes for selective excitation in magnetic resonance spectroscopy and imaging
TL;DR: In this paper, a spin system with a frequency-selective radio-frequency (RF) pulse was used for magnetic resonance spectroscopy and imaging, and the shape of the pulse was optimized.
Related Papers (5)
Broadband and adiabatic inversion of a two-level system by phase-modulated pulses.
The Return of the Frequency Sweep: Designing Adiabatic Pulses for Contemporary NMR
Michael Garwood,Lance DelaBarre +1 more
Effects of Diffusion on Free Precession in Nuclear Magnetic Resonance Experiments
H. Y. Carr,Edward M. Purcell +1 more