Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 64 for “"Pulse Sequence"”.
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Parallel transmit pulse sequence design for ultra-high field (7T) MRI
… which then gives opportunity to add dynamic pTx sequences with minimal disruption. Additionally, pTx spokes pulses are incorporated into a gradient-echo echo-planar imaging (GRE-EPI) sequence (Chapter 6). A task-based functional-MRI (fMRI) experiment shows that data quality (expressed by temporal …
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Investigation of Slow Dynamics in Proteins: NMR Pulse Sequence Development and Application in Triosephosphate Isomerase
… focus on the developing new dynamics detection pulse sequences based on previous Centerband-Only Detection of Exchange (CODEX) experiment and applying CODEX experiments to an enzyme system, triosephosphate isomerase (TIM), for studying the function of the millisecond dynamics in catalysis. Two …
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Accurate monitoring of x, y, and z magnetization for analysis of hardware and pulse sequence performance in NMR spectroscopy
… the nuclear net magnetization at any point in a pulse sequence while eliminating the observation of the other components. This protocol provides an experimental method of tracking magnetization which then can be used in conjunction with theoretical models to scrutinize the predicted outcome of …
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Development of novel NMR pulse sequences
… structures of orgamc molecules in solution using pulse FT NMR, heteronuclear pulse sequence experiments to probe carbon-13 (13C) and proton (1H) spin systems are invaluable. The one-dimensional insensitive nucleus detected PENDANT experiment finds popular use for structure determination via …
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Study of Buoyancy -Induced Flows in a Prototypical CVD Reactor
… and uniformity cannot be improved by applying pulse sequence of precursor gas, pulse sequence of inlet mass flow rate, and time-varying rotation speed of the wafer.
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Development of Optimised Pulse Sequences for Magnetic Resonance Imaging of Tumour Metabolism
Development of efficient pulse sequences for hyperpolarised 13C imaging: Dynamic nuclear spin polarization of 13C-labeled cell substrates has enabled dynamic measurements of tissue metabolism in vivo using 13C MRSI. The principal limitation of the technique is the short lifetime of the …
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Measurement of transient moisture profiles and structural changes during the drying and cooling of maize using MRI
… cooling. A three-dimensional Fourier transform pulse sequence was used.
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Diffusion and Magnetization Transfer Studies of Neural Tissue
… a new apparent diffusion tensor (ADT) imaging pulse sequence was developed and tested, and better insight into the measurement of the ADT was reached using both experiments and simulations.
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Towards Multiplexed Nuclear Magnetic Resonance for Environmental Analysis
… species Daphnia magna. Specifically, a novel pulse sequence that allows the selection of chosen compounds out of a complex mixture was employed, addressing the key challenge of spectral overlap. This powerful technique was used to follow the biochemical impacts of external stressors by …
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Development of Fully Balanced Ssfp and Computer Vision Applications For Mri-Assisted Radiosurgery (Mars)
… gaps in knowledge by: (1) developing an MRI pulse sequence and acquisition protocol that enables high resolution and high SNR MRIs of the implanted radioactive seed markers, prostate, and surrounding anatomy with a single pulse sequence (using fully balanced steady-state free precession) and …
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Understanding and measuring flow in aortic stenosis with MRI
… (TE). However, improvements in an optimised PC sequence (TE 1:5ms) were not satisfactory. Flow estimates remained variable and were underestimated beyond the aortic valve. To reduce the TE further, a new phase contrast pulse sequence based on an ultrashort TE readout trajectory and velocity …
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Intramural mechanics in the human tongue
… with a fast asymmetric gradient echo imaging pulse sequence (TurboFLASH). This MRI technique discretize tissue into non-linear deforming elements. Individual elements were defined by selectively supersaturating bands of magnetic spins in resting tongue tissue along the antero-posterior and …
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Decoherence and Dynamical Decoupling in Solid-State Spin Qubits
… problem. The method is applicable to any ideal pulse sequence applied to the qubit. Dynamical decoupling sequences, which aim to prolong qubit coherence, are analyzed. In particular, concatenated dynamical decoupling sequences are shown to prolong not only the coherence time over the entire …
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Determining optimum imaging parameters for SWIFT: application to superparamagnetic iron oxides and magnetized objects.
A relatively new pulse sequence in MRI known as SWIFT, sweep imaging with Fourier transformation, has been shown to effectively image spins with both short and long transverse and longitudinal relaxation rates. It is desirable to have equations that accurately describe the signal of spins when …
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Magnetic resonance imaging modeling and applications to fast imaging and guidance of ultrasound surgery.
… was developed to simulate virtually any MRI pulse sequence. The phase encoding gradient pulses are also included which has proved to be very useful in predicting image artifacts and contrast behavior. The second is the application of MRI in guiding ultrasound surgery. A detailed study was …
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Dynamics and NMR implementation of controlled-NOT gates for quantum computing
… of magnetization) by applying a selective RF pulse of constant power and variable duration. From this collection of spectra, the effective Hamiltonian of the spin system was derived and found to contain an internal Hamiltonian. In a spin system with weak coupling, the internal Hamiltonian …
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Order phenomena in polymer crystallization
… melts has been followed with an improved NMR pulse sequence which is sensitive to differences in the mobility of polymer chains or chain segments. In comparison to X-ray measurements, in which structural changes can be monitored, with these experiments we were hoping to gain new insights in to …
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Magnetic resonance imaging of the cerebral metabolic rate of oxygen (CMRO₂)
… technique, including design of a novel MRI pulse sequence, explanation of the principal sequence parameters, and results from initial human experiences. A human trial follows, in which QUIXOTIC is used to measure cortical gray matter CMRO₂ in ten healthy volunteers.
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Determination of Thermal Dose Model Parameters Using Magnetic Resonance Imaging
… outcomes. Another is to use a multi-parametric pulse sequence designed for simultaneous monitoring of temperature and damage dependent MR parameters. These methodologies were developed and investigated in phantom and feasibility established using retrospective analysis of <em>in vivo …
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MAS NMR of Nuclei with Spin S=1/2 in Polycrystalline Powders: Experiments and Numerical Simulations
… keeping the advantages of MAS, is the use of pulse sequences that reintroduce ("recouple") anisotropic dipolar coupling interactions. To access the spin-system parameters encoded in the lineshapes of MAS NMR spectra an iterative fitting approach is applied. These procedures make numerically …
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