2006年5月10日 In this article we present a strategy for using internal water as a concentration standard in SI studies, drawing on previous reports by others on single-voxel MRS (1-4, 12) as well as SI methods using other concentration
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1999年10月1日 The purpose of this study was to investigate the relationship between the magnetic susceptibility of brain tissue and iron concentration. Phase shifts in gradient-echo
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Two non-Cartesian steady-state spoiled ultrashort echo time (UTE) scans, performed at optimized flip angles, repetition time and pulse length determined under specific absorption rate
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2002年4月22日 GABA (γ-aminobutyric acid (NH 2 - α CH 2 - β CH 2 - γ CH 2 -CO 2 H)) is the major inhibitory neurotransmitter in the human brain. 1 H NMR spectroscopy has been used to detect human GABA levels in vivo ( 1, 2) and
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2010年11月1日 The results of this study show that transverse MR relaxation rates are valid in vivo measures of brain iron concentration, with R2* as the preferred parameter because it is more sensitive than R2 to variations in iron
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A strategy for using tissue water as a concentration standard in (1)H magnetic resonance spectroscopic imaging studies on the brain is presented, and the potential errors that may
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2013年7月2日 Magnetic resonance imaging (MRI)-based techniques for assessing liver iron concentration (LIC) have been limited by single scanner calibration against biopsy.
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2009年11月1日 The iron concentration of the parietal cortex was significantly positively correlated with the severity of cognitive impairment in patients with Alzheimer disease, indicating that it may be used as a biomarker to evaluate
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Measurement of the water proton spin-lattice relaxation time, or a signal amplitude proportional to it, may provide a noninvasive measure of peptide bond concentration, which provides a direct
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Purpose: To demonstrate the application of Mescher-Garwood (MEGA) point-resolved spectroscopy sequence (PRESS) editing to the detection of lactate in the brain at 3T and to investigate changes in lactate concentration associated with inspiratory gas challenges. Materials and methods: Edited lactate measurements were made in six healthy volunteers
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2019年5月15日 Pre-concentration followed by magnetization roasting and magnetic separation process was well recognized to be very effective in recycling iron from iron ore tailings. An iron concentrate containing 66.35% Fe with a total recovery of 57.74% was produced under the optimal experimental conditions ...
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2002年4月22日 The GABA concentration determined in this study was somewhat less than the previously reported 1.1 μmol/g and 1.3 μmol/g measured in the same brain region relative to 8 μmol/g Cr. However, most previous
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Abstract: A bench top magnetic separator is described which is suitable for separating red blood cells infected with malarial parasites from whole blood. The separator is based on a compact 0.7T permanent magnet and uses a high gradient magnetic filter of approximately 2.5 cm 3 volume. Experiments with malaria parasitised mouse red cells (Plasmodium berghei) show that final
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2013年6月11日 The change in the growth rate of the Nb3Sn product phase because of Ti addition is studied for solid Nb(Ti)–liquid Sn interactions. The growth rate increased from no Ti to 1 at.% and 2 at.% of Ti in Nb, and the activation energy decreased from 221 kJ/mol to 146 kJ/mol. Based on the estimated values, the role of grain boundary and lattice diffusion is discussed in
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What is the concentration of nitrate ions if equal volumes of 0.1 M A g N O 3 and 0.1 M NaCl are mixed together. View Solution. Q4. Equal volumes of 0.1M A g N O 3 and 0.2 M NaCl are mixed together. The concentration of nitrate ions in the resulting mixture is: View Solution. Q5.
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Background: FerriScan is the method-of-choice for noninvasive liver iron concentration (LIC) quantification. However, it has a number of drawbacks including cost and expediency. Purpose/hypothesis: To characterize an R2*-based MRI technique that may potentially be used as an alternative to FerriScan. This was accomplished through the derivation of a calibration
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2006年5月10日 A strategy for using tissue water as a concentration standard in 1 H magnetic resonance spectroscopic imaging studies on the brain is presented, and the potential errors that may arise when the method is used are examined. The sensitivity of the method to errors in estimates of the different water compartment relaxation times is shown to be small at short
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Qualitative and quantitative 1 H NMR spectroscopy for determination of divalent metal cation concentration in model salt solutions, food supplements, and pharmaceutical products by using EDTA as chelating agent Magn Reson Chem. 2020 Jul;58(7):653-665. doi: 10.1002/mrc.5009. ...
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Purpose: To increase the sensitivity of 3-dimensional fluid-attenuated inversion recovery (3D-FLAIR) to low concentration gadolinium (Gd)-based contrast medium, we optimized sequence parameters on a phantom and evaluated the optimized sequence in patients suspicious for endolymphatic hydrops. Materials and methods: All scans were performed on a 3-tesla
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Magn Reson Med. 2009 Nov;62(5):1326-30. doi: 10.1002/mrm.22097 ... at 4.7T using a multiecho adiabatic spin-echo (MASE) imaging sequence. We attempted to quantify the nonhemin iron concentration ([Fe]) in various brain regions in vivo based on the linear relationship between the apparent relaxation rate constant (R(2) = 1/T(2) and ...
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2014年8月12日 Myocardial T2 correlates well with myocardial iron concentration, which raises the possibility that T2 may provide additive information to T2* for patients with myocardial siderosis. However, ex-vivo T1 measurements are less reliable due to the severe chemical effects of formalin on T1 shortening, a
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Question: Which of the following solutions will have the highest concentration of chloride ions? A) 0.10 M sodium chloride B) 0.10 M magnesium chlorideC) 0.10 M aluminum chloride D) 0.05 M calcium chloride E) All of these solutions have the
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The purpose of this study was to investigate the relationship between the magnetic susceptibility of brain tissue and iron concentration. Phase shifts in gradient-echo images (TE = 60 ms) were measured in 21 human subjects, (age 0.7-45 years) and compared with published values of regional brain iron
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1999年10月1日 Phase data analysis. Measured values of phase, Φ, were hypothesized to vary linearly with putative iron concentration: (3) Φ=Φ 0 +k[Fe] where Φ 0 is the phase in the absence of iron, and the slope k is the rate of change of phase per unit iron concentration. The parameters Φ 0 and k were estimated in two different ways from the regional phase data.
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Proton density fat-fraction: a standardized MR-based biomarker of tissue fat concentration. ... J Magn Reson Imaging. 2012 Nov;36(5):1011-4. doi: 10.1002/jmri.23741. Epub 2012 Jul 6. Authors Scott B Reeder, Houchun H Hu, Claude B Sirlin. PMID: 22777847 PMCID: PMC4779595 DOI: 10.1002/jmri.23741 No abstract available. Publication types ...
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Diagnostic usefulness of water-to-fat ratio and choline concentration in malignant and benign breast lesions and normal breast parenchyma: an in vivo (1) H MRS study J Magn Reson Imaging . 2011 Apr;33(4):855-63. doi: 10.1002/jmri.22493.
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Commercial N50 Nd-Fe-B magnet was processed by a combined diffusion process with Pr65Cu15Al20, followed with Pr50Tb30Al20 (at %). The coercivity increment from the original 965.6 kA/m to 1672.5 kA/m was achieved in the combined diffusion sample by introducing 0.23 wt% Tb. However, the coercivity of the conventionally diffused sample with similar Tb content
MoreARTICULAR CARTILAGE is a thin layer of connective tissue covering the ends of bones in joints. Even though the tissue is thin (typically 0.5–2 mm), articular cartilage has a unique depth-dependent structure, both biochemically (eg, concentration variations) and morphologically (eg, subtissue structural zones) (1–4).This depth-dependent organization of cartilage essentially
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2021年1月1日 For a given IgG concentration c IgG, each single MNP may be bound with more IgG, resulting in larger effective hydrodynamic sizes when decreasing the MNP concentration. ... J. Magn. Magn. Mater., 427 (2017), pp. 156-161. View PDF View article View in
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