Assessment and correction ofB1-induced errors in magnetization transfer ratio measurements
نویسندگان
چکیده
منابع مشابه
Magnetization transfer ratio in Alzheimer disease: comparison with volumetric measurements.
BACKGROUND AND PURPOSE Alzheimer disease (AD) is accompanied by macroscopic atrophy on volumetric MR imaging. A few studies have also demonstrated reduction in magnetization transfer ratio (MTR), suggesting microstructural changes in remaining brain tissue. This study assessed the value of measuring MTR in addition to volumetric MR in differentiating patients with AD from control subjects. MA...
متن کاملCorrection and Normalization of Magnetization Transfer Ratio Maps for Quantitative Analysis
Introduction Magnetization Transfer (MT) imaging is of increasing interest in neuroimaging, yielding important information, e.g. about myelin integrity in the central nervous system [1, 2]. However, a quantitative analysis of the MT ratio (MTR) is affected by several problems, especially at high field strengths: B1 inhomogeneities influence the MT saturation angle, biasing MTR values. High spec...
متن کاملComparing free water imaging and magnetization transfer measurements in schizophrenia.
Diffusion weighted imaging (DWI) has been extensively used to study the microarchitecture of white matter in schizophrenia. However, popular DWI-derived measures such as fractional anisotropy (FA) may be sensitive to many types of pathologies, and thus the interpretation of reported differences in these measures remains difficult. Combining DWI with magnetization transfer ratio (MTR) - a putati...
متن کاملAnalysis of Magnetization Transfer Ratio Measurements at 3T Using Multiple-Acquisition Balanced SSFP
Introduction. Magnetization transfer (MT) has become an important tool to study various tissue abnormalities, such as demyelination in brain white matter [1]. Recently, it has been shown that fast MT scans based on balanced steady-state free precession (bSSFP) with RF pulse modification achieve high SNR and high reproducibility at 1.5T [2]. At 3T, combination of multiple, phase-cycled, bSSFP sc...
متن کاملHigh resolution Magnetization Transfer Ratio (MTR) mapping in Multiple Sclerosis
Introduction: Multiple Sclerosis (MS) is a condition that affects young adults typically aged 20-40 years, and involves inflammation and demyelination of neural axons in the brain and nervous system. Magnetization transfer (MT) imaging studies the interaction between water and macromolecular (e.g.Protein in Myelin) protons and can be a useful in studying the changes in normal appearing white ma...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2004
ISSN: 0740-3194,1522-2594
DOI: 10.1002/mrm.20310