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- Eugene Stephane Mananga, A. E. Reid, Thibault Charpentier
- Solid state nuclear magnetic resonance
- 2012

This article describes the use of an alternative expansion scheme called Floquet-Magnus expansion (FME) to study the dynamics of spin system in solid-state NMR. The main tool used to describe the effect of time-dependent interactions in NMR is the average Hamiltonian theory (AHT). However, some NMR experiments, such as sample rotation and pulse crafting,â€¦ (More)

Solving a time-dependent linear differential equation towards obtaining evolution operators is a central problem in solid-state nuclear magnetic resonance. To this end, average Hamiltonian theory and Floquet theory have been the two commonly used theoretically methods in spin dynamics of NMR. We recently introduced the Floquet-Magnus expansion approach andâ€¦ (More)

- Eugene Stephane Mananga, Thibault Charpentier
- The Journal of chemical physics
- 2011

In this article, we present an alternative expansion scheme called Floquet-Magnus expansion (FME) used to solve a time-dependent linear differential equation which is a central problem in quantum physics in general and solid-state nuclear magnetic resonance (NMR) in particular. The commonly used methods to treat theoretical problems in solid-state NMR areâ€¦ (More)

- Eugene Stephane Mananga
- Solid state nuclear magnetic resonance
- 2013

This work presents the possibility of applying the Floquet-Magnus expansion and the Fer expansion approaches to the most useful interactions known in solid-state nuclear magnetic resonance using the magic-echo scheme. The results of the effective Hamiltonians of these theories and average Hamiltonian theory are presented.

It is expected that both noise and activity distribution can have impact on the detectability of a myocardial defect in a cardiac PET study. In this work, we performed phantom studies to investigate the detectability of a defect in the myocardium for different noise levels and activity distributions. We evaluated the performance of three reconstructionâ€¦ (More)

- Eugene Stephane Mananga, C. D. Hsu, Sasha A. Ishmael, T Islam, Gregory S. Boutis
- Journal of magnetic resonance
- 2008

In this work, we investigate the accuracy of controlling spin I=1, 3/2 and 5/2 spin systems by average Hamiltonian theory. By way of example, we consider a simple two-pulse echo sequence and compare this perturbation scheme to a numerical solution of the Von Neumann equation. For the different values of I, we examine this precision as a function of theâ€¦ (More)

Investigation of the effect of finite pulse errors on the BABA pulse sequence using the Floquetâ€“Magnus expansion approach Eugene S. Mananga a & Alicia E. Reid b a Harvard University, Harvard Medical School and Massachusetts General Hospital, Center for Advanced Radiological Sciences, Division of Nuclear Medicine and Molecular Imaging Physics, Department ofâ€¦ (More)

- Gregory S. Boutis, Christopher Renner, +7 authors Doug Wei
- Biopolymers
- 2007

We report on the direct measurement of the molecular diffusion coefficients of water confined to purified bovine nuchal ligament elastin by high resolution q-space NMR imaging. The experimental data indicate that water trapped within an elastin fiber has two distinguishable molecular diffusion coefficients. The component with the slowest mobility has aâ€¦ (More)

- Eugene Stephane Mananga
- Solid state nuclear magnetic resonance
- 2013

The purpose of this article is to present an historical overview of theoretical approaches used for describing spin dynamics under static or rotating experiments in solid state nuclear magnetic resonance. The article gives a brief historical overview for major theories in nuclear magnetic resonance and the promising theories. We present the firstâ€¦ (More)

- Eugene Stephane Mananga, Rabia Roopchand, Yisa S Rumala, Gregory S. Boutis
- Journal of magnetic resonance
- 2007

Magic echo cycles are introduced for performing quadrupolar echo spectroscopy of spin-1 nuclei. An analysis is performed via average Hamiltonian theory showing that the evolution under chemical shift or static field inhomogeneity can be refocused simultaneously with the quadrupolar interaction using these cycles. Due to the higher convergence in the Magnusâ€¦ (More)