نتایج جستجو برای: proton magnetic resonance
تعداد نتایج: 457561 فیلتر نتایج به سال:
Magnetic resonance spectroscopy (MRS) is a non-invasive technique useful both in research and neuroclinical evaluation. It relies on the same physical principles of magnetic resonance imaging providing information on chemical compounds in vivo. MRS uses the magnetic properties of several nuclei such as 13C, 31P and 19F, although the 1H is the most common due to its abundance and magnetic resona...
Background and Aim: Brain tumors have remained as a significant cause of morbidity and mortality and are often refractory to treatment. The grading of brain tumor has an important implication in clinical management. Currently, magnetic resonance spectroscopy (MRS) is an important dimension in evaluating metabolites and grading brain tumors. The aim of this study is to evaluate metabolites in br...
BACKGROUND Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is a hereditary syndrome caused by mutations of the Notch3 gene, usually localized to exons 3 and 4. OBJECTIVES To report a novel pathogenetic mutation occurring in exon 6 of the Notch3 gene, a location not previously recognized in patients with CADASIL, and to report the results of...
AAPM Magnetic Resonance Task Group #9 on proton magnetic resonance spectroscopy (MRS) in the brain was formed to provide a reference document for acquiring and processing proton (1H) MRS acquired from brain tissue. MRS is becoming a common adjunct to magnetic resonance imaging (MRI), especially for the differential diagnosis of tumors in the brain. Even though MR imaging is an offshoot of MR sp...
An imaging method is described that makes use of proton double quantum nuclear magnetic resonance (NMR) to construct images based on selected metabolites such as lactic acid. The optimization of the method is illustrated in vitro, followed by in vivo determination of lactic acid distribution in a solid tumor model. Water suppression and editing of lipid signals are such that two-dimensional spe...
High resolution nuclear magnetic resonance spectroscopy has already proved its ability to yield valuable information on the structure, reactivity and exchange rate of a variety of compounds. Although its application to substances in aqueous solution has often been limited by solubility and exchange, it has been possible to detect the spectra of several amino acids and dipeptides in water (I). T...
This thesis explores magnetic resonance (MR) imaging methodologies that provide in vivo spectroscopic information. To date such information has not been routinely acquired and used in diagnosis. The general objective of the thesis is to develop and implement new and fast MR spectroscopic imaging techniques that can be practically utilized to study spectroscopic information in vivo. This thesis ...
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