نتایج جستجو برای: chemical shift imaging
تعداد نتایج: 945818 فیلتر نتایج به سال:
Introduction Proton MR chemical shift imaging (CSI) of brain metabolites can identify biomarkers relevant to healthy or metabolic cerebral metabolism. At short TE, strongly J-coupled and short T2 metabolites can be detected. High field offers higher SNR and improved spectral resolution with the disadvantage of increased B1 and B0 heterogeneities as well as chemical shift displacement error (CSD...
A new approach to MRI thermometry using encapsulated hyperpolarized xenon is demonstrated. The method is based on the temperature dependent chemical shift of hyperpolarized xenon in a cryptophane-A cage. This shift is linear with a slope of 0.29 ppm °C(-1) which is perceptibly higher than the shift of the proton resonance frequency of water (ca. 0.01 ppm °C(-1)) that is currently used for MRI t...
Introduction: Compared to single voxel spectroscopy, phase encoded chemical shift imaging (CSI) has the advantage of obtaining spectra from a rectangular array of voxels in a single study. However, long acquisition times are required to achieve reasonable spatial resolutions due to the time consuming phase encoding steps, which limits clinical applications of CSI. Hu et. al. (1) developed a tec...
PURPOSE To analyze the effect of B0 field drift on multivoxel MR spectroscopic imaging and to propose an approach for its correction. THEORY AND METHODS It is shown, both theoretically and in a phantom, that for ∼30 min acquisitions a linear B0 drift (∼0.1 ppm/h) will cause localization errors that can reach several voxels (centimeters) in the slower varying phase encoding directions. An effi...
A high-resolution human in vivo spectroscopic image was obtained using the 2.0-T NMR imaging system developed at KAIS (Korea Advanced Institute of Science). The in vivo spectroscopic image obtained has high spatial resolution as well as spectral resolution good enough for extraction of the detailed spectroscopic information. This high-resolution spectroscopic imaging was made possible by use of...
Background 13C Dynamic Nuclear Polarization (DNP) with rapid dissolution together with Magnetic Resonance Chemical Shift Imaging (CSI) have been used for non-invasive real-time metabolic assessment in cardiac experimental models on a clinical 3T scanner. Here, we report an in vivo comparison of hyperpolarized [1-13C] pyruvate and [1-13C] acetate perfusion and metabolism: a method based on a 3D ...
in this research at the first metoprolol drug and its fullerene derivative were optimized. natural bond orbital (nbo), nuclear indepndent chemical shift (nics) and finally ir calculations, for these compounds were carried out at the b3lyp/6-31g* quantum chemistry level. different parameters such as energy levels, the amount of chemical shift in different atoms, the amount of homo/lumo, chemical...
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