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Results 1 - 10
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466
Brain magnetic resonance imaging with contrast dependent on blood oxygenation.
- Proc. Natl. Acad. Sci. USA
, 1990
"... ABSTRACT Paramagnetic deoxyhemoglobin in venous blood is a naturally occurring contrast agent for magnetic resonance imaging (MRI). By accentuating the effects of this agent through the use of gradient-echo techniques in high fields, we demonstrate in vivo images of brain microvasculature with imag ..."
Abstract
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Cited by 648 (1 self)
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to localized spectroscopy (2) and chemical shift imaging (3) that are applicable to many chemical species, MRI of water protons has been functionally extended to NMR angiography (4), perfusion imaging It has previously been demonstrated (8, 9) that the presence of deoxyhemoglobin in blood changes the proton
Brain, MR spectroscopy
, 1999
"... Objective: The purpose of our study was to determine the ability of H-1 MR spectroscopy (MRS) to lateralize the lesion in patients with hippocampal sclerosis. Materials and Methods: Twenty healthy volunteers and 25 patients with intractable temporal lobe epilepsy whose MR imaging diagnosis was unila ..."
Abstract
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Cited by 1 (0 self)
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Objective: The purpose of our study was to determine the ability of H-1 MR spectroscopy (MRS) to lateralize the lesion in patients with hippocampal sclerosis. Materials and Methods: Twenty healthy volunteers and 25 patients with intractable temporal lobe epilepsy whose MR imaging diagnosis
Anomalous J-Modulation Effects on Amino Acids in Clinical 3T MR Spectroscopy
"... SUMMARY: The signal-intensity loss from anomalous J-modulation effects due to chemical-shift displacement was investigated on amino acid groups (alanine, valine, leucine, and isoleucine) at 3T by using point-resolved 1H spectroscopy in patients with brain abscess and phantom experiments. With a larg ..."
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SUMMARY: The signal-intensity loss from anomalous J-modulation effects due to chemical-shift displacement was investigated on amino acid groups (alanine, valine, leucine, and isoleucine) at 3T by using point-resolved 1H spectroscopy in patients with brain abscess and phantom experiments. With a
ORIGINAL RESEARCH Metabolic Findings on 3T 1H-MR Spectroscopy in
"... BACKGROUND AND PURPOSE: Little is known about the metabolic properties of brain edema associ-ated with tumors. This work was conducted on the basis of the assumption that, in the presence of intra-axial and extra-axial brain tumors, the white matter involved by the edema is a site of metabolic chang ..."
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-containing compounds. Measurements on proton MR spectroscopy (1H-MR spectroscopy) were performed with a 3T whole-body scanner with use of a point-resolved spectroscopy sequence for localization (TR, 2000 ms; TE, 35 ms), and the metabolites were quantified with the SAGE method. Peak intensities of the main metabolites
An Implication of Ether Drift
, 1998
"... The experimental results of the two-photon absorption(TPA) and Mössbauerrotor(MR) for testing the isotropy of the speed of light are explained in an ether drift model with a drift velocity of ∼ 10 −3 c. Further tests of the ether drift assumption are suggested. 1 Mailing address 1 In Einstein’s theo ..."
Abstract
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The experimental results of the two-photon absorption(TPA) and Mössbauerrotor(MR) for testing the isotropy of the speed of light are explained in an ether drift model with a drift velocity of ∼ 10 −3 c. Further tests of the ether drift assumption are suggested. 1 Mailing address 1 In Einstein’s
COMBINATION BANDS IN THE INFRARED SPECTROSCOPY OF KAOL INS--A DRIFT SPECTROSCOPIC STUDY
"... Abstraet--Kaolinites with varying degrees of defect structures have been studied by both mid-infrared (IR) and near-IR diffuse reflectance spectroscopy (DRIFT). Difference bands were observed in the 2650-to 2750-cm I region. This region coincides with the kaolinite-deuterated hy roxyl stretching reg ..."
Abstract
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Cited by 1 (0 self)
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Abstraet--Kaolinites with varying degrees of defect structures have been studied by both mid-infrared (IR) and near-IR diffuse reflectance spectroscopy (DRIFT). Difference bands were observed in the 2650-to 2750-cm I region. This region coincides with the kaolinite-deuterated hy roxyl stretching
Higher Field Strength for Proton MR Spectroscopy
"... MR imagers with magnetic fields (B0) greater than 1.5 T are offered by all major manufacturers. Al-though 4-, 6-, 7-, and even 8-T, whole-body instru-ments are currently operational, the most common high-B0 systems are the nearly 100 installed with 3-T magnets. The demand for bigger B0 systems has b ..."
Abstract
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MR imagers with magnetic fields (B0) greater than 1.5 T are offered by all major manufacturers. Al-though 4-, 6-, 7-, and even 8-T, whole-body instru-ments are currently operational, the most common high-B0 systems are the nearly 100 installed with 3-T magnets. The demand for bigger B0 systems has
MR Stankovic: Non-invasive optical monitoring of the newborn piglet brain using continuous wave and frequency domain spectroscopy. Phys Med Biol
, 1999
"... using continuous-wave and frequency-domain spectroscopy ..."
Abstract
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Cited by 21 (4 self)
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using continuous-wave and frequency-domain spectroscopy
CASE REPORT MR Spectroscopy Detects Lipid Peaks in
"... SUMMARY: CTX is a rare lipid-storage disease. Novel MRS findings from 3 patients, using a short TE, were the presence of lipid peaks at 0.9 and 1.3 ppm in the depth of the cerebellar hemisphere; this might represent an additional marker of disease that is CNS-specific and noninvasive. A decrease in ..."
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/phosphocreatine; CTX cerebrotendinous xanthomatosis; Lip lipid; Lip09 lipid signals at 0.9 ppm; Lip13 lipid signals at 1.3 ppm; mIns myo-inositol; MRS MR spectroscopy; NAA N-acetylaspartate; PRESS point-resolved spectroscopy sequence; STEAM short echo time stimulated echo acquisition mode; VOI volume
Background-signal Parameterization in In Vivo MR Spectroscopy
, 2002
"... This study concerns parameterization and subsequent subtraction of the fast decaying signals of macromolecules from in vivo MRS signals of tissue metabolites of interest. The parameterization is done with a State Space approach (HSVD) based on singular value decomposition. The method is tested with ..."
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with a simulated non-exponentially damped macromolecule signal and an exponentially damped metabolite signal. and is compared with mere omission of initial samples. Exact analytic expressions of the macromolecule signal are derived in both the time domain and the frequency domain.
Results 1 - 10
of
466
