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.
Results
Showing 1 to 20 of 87 for “"spectroscopic Imaging"”.
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Mid infrared spectroscopic imaging and tomography
Fourier Transform Infrared (FT-IR) Spectroscopic Imaging is an optical technique that simultaneously provides morphological (two dimensional) and mid-infrared spectral (one dimensional) information for a specimen under observation. In this dissertation, we develop a new instrument that extends the …
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Line scan proton magnetic resonance spectroscopic imaging
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1995.
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Detecting cervical dysplasia with quantitative spectroscopic imaging
… implementation to wide-area quantitative spectroscopic imaging (QSI) for complete coverage of at-risk tissue. QSI uses the scanning virtual probe concept that is critical for model-based spectroscopy and offers spatial resolution advantages over conventional wide-field illumination. We …
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Accelerated J-resolved proton magnetic resonance spectroscopic imaging
1H-MRSI has long been recognized as a powerful tool for noninvasive mapping of metabolites and neurotransmitters. A fundamental challenge of conventional 1H-MRSI is that resonances from different molecules overlap with one another in the crowded chemical shift frequency spectrum, which will lead to …
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Model-based reconstruction of magnetic resonance spectroscopic imaging
Magnetic resonance imaging (MRI) is a medical imaging technique that is used to obtain images of soft tissue throughout the body. Since its development in the 1970s, MRI has gained tremendous importance in clinical practice because it can produce high quality images of diagnostic value in an ever …
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Subspace estimation for subspace-based magnetic resonance spectroscopic imaging
This Thesis was approved for publication on 2016-04-15 at 14:08.
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Ultrafast magnetic resonance spectroscopic imaging: technical development and applications
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-08-01
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Magnetic resonance spectroscopic imaging using parallel transmission at 7T
Conventional magnetic resonance spectroscopic imaging (MRSI), also known as phase-encoded (PE) chemical shift imaging (CSI), suffers from both low signal-to-noise ratio (SNR) of the brain metabolites, as well as inflexible tradeoffs between acquisition time and spatial resolution. In addition, …
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Visible spectroscopic imaging on the Alcator C-Mod tokamak
… on the development of a diagnostic visible imaging system on the Alcator C-Mod tokamak and the results from that system. The dissertation asserts the value of this system as a qualitative and quantitative diagnostic for magnetically confined plasmas. The visible imaging system consists of …
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Excitation and readout Designs for high field spectroscopic imaging
… problems that arise in magnetic resonance imaging RF excitation with parallel transmission (pTx) and magnetic resonance spectroscopic imaging (MRSI). Recent work in parallel RF excitation in MRI has been demonstrated to offer dramatically improved flexibility for manipulation of …
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Fast magnetic resonance spectroscopic imaging using RF coil arrays
Conventional Magnetic Resonance Spectroscopic Imaging (MRSI) suffers from both low signal-to-noise (SNR), as well as long acquisition times. The development of high-fidelity gradient coils has opened opportunities for fast k-space encoding schemes that are already used in structural imaging. At the …
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Clinically relevant magnetic resonance imaging and spectroscopic imaging development
… of this thesis, a single slab 3D fast spin echo imaging (3DFSE) method has been implemented and optimized. This involved sequence design and implementation, SAR considerations, parameter adjustments and clinical testing. The method can deliver 3D Tl or T2 weighted brain image with isotropic Imm3 …
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A subspace approach to high-resolution magnetic resonance spectroscopic imaging
… the human body noninvasively, magnetic resonance spectroscopic imaging (MRSI) has been recognized as a powerful tool for in vivo metabolic studies. However, research and clinical applications of in vivo MRSI have been progressing more slowly than expected. The main reasons for this situation are …
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Nanostructured Devices for Ultrasensitive and High Throughput Vibrational Spectroscopic Imaging
… can enable rapid, simultaneous and quantitative imaging of tens to hundreds of species at ultra-low concentrations. Central to addressing this challenge is the availability of a modality capable of sensitive, rapid, cost-effective and multiplexed sensing. Further, the microscopic heterogeneity of …
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Characterizing intercellular heterogeneity in tumor microenvironments via infrared spectroscopic imaging
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-12-01
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Discrete frequency mid-infrared spectroscopic imaging using quantum cascade lasers
Infrared (IR) spectroscopic imaging is an analytical technique that directly images the spatial distribution of chemical components within a sample in the absence of external contrast agents. This is especially advantageous with biological samples where the mid to far-infrared wavelength range …
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A subspace approach to spectral quantification for MR spectroscopic imaging
… spectral quantification for magnetic resonance spectroscopic imaging (MRSI) is addressed in this thesis. We present a novel approach to solving this problem, incorporating both spatial and spectral prior information. More specifically, a new signal model is proposed which represents the spectral …
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Analysis of the composition of latent fingermarks by spectroscopic imaging techniques.
… MALDI mass spectrometry in profiling and imaging mode to investigate latent fingermarks, with SERS and ATR-FTIR used as complementary techniques.One of the major issues of using analytical techniques to investigate latent fingermarks is their inadequate application to real crime scene …
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Spectral estimation with spatio-spectral constraints for magnetic resonance spectroscopic imaging
Magnetic resonance spectroscopic imaging (MRSI) is a promising tool to acquire in vivo biochemical information, and spectral estimation (quantification) of MRSI data is an important step towards quantitative studies. Although a large body of work has been done on spectral estimation over the past …
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