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 8 of 8 for “"Parameter mapping"”.
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Tissue Parameter Mapping in Children with Fetal Alcohol Spectrum Disorders
… brain are not clearly understood. MRI relaxation parameters T1, T2, T2* and proton density (PD), are basic tissue properties that reflect the underlying biology. The present study aims to advance our understanding of how PAE alters the microstructural properties of tissue by examining PAE-related …
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Fast MRI with sparse sampling: models, algorithms, and applications
… MRI applications, i.e., dynamic MRI and MR parameter mapping. First, we propose a novel constrained image model, the joint low-rank and sparse model, to enable dynamic image reconstruction from highly undersampled (k, t)-space data. Low-rank and sparse models are two low-dimensional signal …
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Improved convergence for optimization of evasive maneuvering
… is large in terms of the number of optimization parameters, and perhaps in terms of the number of nonlinear constraints. Since both MaRV and ABM trajectories are expensive to compute, rapid convergence of the optimization algorithm is of prime concern. This paper examines a discontinuity in the …
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Automated inter-model parameter connection synthesis for simulation model integration
… by creating connections between their interface parameters, referred to as parameter mapping, that are either shared by common models or flow from the output of one model to the input of a second model. However, the process of integrating simulation models together is time consuming, and this …
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Combining Computational Techniques with Physics for Applications in Accelerated MRI
… optimization of sequences for quantitative MR parameter mapping. Auto-differentiation through simulations computes necessary gradients for optimization. Finally, we propose an optimization scheme that designs radio-frequency pulse amplitudes for reduced heating in Fetal MRI, while maintaining …
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COMPARISON ON DIFFERENT DISCRETE FRACTIONAL FOURIER TRANSFORM (DFRFT) APPROACHES
… domain, several methods of extraction and parameter estimation for chirp signals are proposed, and a comparative study has been done on chirp signal estimation. Computation of the discrete fractional Fourier transform (DFRFT) and its chirp concentration properties are dependent on the basis …
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Energy-efficient multi-criteria packet forwarding in multi-hop wireless networks
… A general cost metric in the form of a multi-parameter mapping function aggregates decision criteria into a single metric used to rank potential relay candidates. A two-criteria RSRE case study shows that a proper combination of greedy forwarding and link quality leads to higher energy …
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Development, Validation, and Testing of a Sonification Framework with a Neurosurgical Targeting Task
VR applications in medicine offer high potential for cost-savings and accessible educational modalities. Sonification, the use of non-speech audio to convey information, is also increasingly complex and viable for commercial applications. Together, these technologies can be leveraged to improve …