A comparison of static and dynamic ∆B mapping methods for - PubMed
Purpose To assess the performance in the presence of scanner instabilities of three dynamic correction methods which integrate ∆B mapping into the chemical exchange saturation transfer (CEST) measurement and three established static ∆B -correction approaches Methods A homogeneous phantom and five healthy volunteers were scanned with a CEST …
Synthesis and optical properties of CsPbBr - RSC Publishing
Green-emitting Cs PbBr nanocrystals were synthesized by the water-assisted solid-state reaction method for the first time Although CsPbBr phases were observed in the X-ray diffraction (XRD) patterns of the perovskite nanocrystal samples as impurities the XRD patterns of the samples could be well indexed to the trigonal Cs PbBr structure The Cs …
Magnetic Resonance gagCEST Imaging of the Human Lumbar …
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Evaluating Lumbar Intervertebral Disc Degeneration on a …
May · Using the WASSR maximum-symmetry algorithm to determine a pixel-wise frequency offset curve B-field inhomogeneities were corrected as previously published To this end pixel-wise frequency offset-corrected CEST-curves were determined and divided by the signal without presaturation (S) to establish the z-spectrum (Z (ω)) with a
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Keyhole Chemical Exchange Saturation Transfer - PMC
The B shift calculated by WASSR over all the phantoms ranged from − to Hz Therefore WASSR data acquired at full resolution (×) was also applied for correction of the reconstructed data The mean and standard deviation in CEST contrast (WASSR corrected) from the full resolution dataset are used as a "gold standard"
An overview of CEST MRI for non-MR physicists - EJNMMI Physics
Aug · The search for novel image contrasts has been a major driving force in the magnetic resonance (MR) research community in order to gain further information on the body s physiological and pathological conditions Chemical exchange saturation transfer (CEST) is a novel MR technique that enables imaging certain compounds at concentrations …
A method for measuring B field inhomogeneity using
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Improvement of water saturation shift referencing by sequence and
Jul · The simulation showed different shapes of WASSR curves for different B -amplitudes and pulse durations For the low B -amplitude of μT only a single minimum was found in WASSR spectra whereas for a B -amplitude of μT either a single minimum or two minima were found depended on the PD Two minima were more pronounced for higher …
A comparison of static and dynamic ∆B mapping methods for …
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An end‐to‐end AI‐based framework for - Wiley Online Library
Jan · Conventional CEST images were corrected for B inhomogeneity using the WASSR method The MTR asym was calculated using MTR asym = (S-Δ ω-S Δ ω) S where S ± Δ ω is the signal measured with saturation at ± the relevant solute chemical shift and S is the unsaturated signal
Water saturation shift referencing (WASSR) for chemical exchange
Jun · Europe PMC is an archive of life sciences journal literature
US Patent Application for MRI METHOD FOR - Justia Patents …
Jan · A WASSR data acquisition method may be used with a minimal set of sample points e g to to measure the field map frequency at a voxel for which it is known based on the reference scan that it must be close to zero The offset that needs to be added to the field map may be calculated from the reference scan using the WASSR measurement
MatISSE Glenn Research Center NASA
Jan · WASSR WAter Sounding Short-range Radar Mars surface Mapping Lidar Swath Mapping Lidar with Fiber Lasers and PN Code Modulation Airless body surfaces asteroids comet core or planets Chromatography Ion Liquid Chromatography for Exploration of Solar System (ILCESS)
Keyhole chemical exchange saturation transfer - Wiley Online Library
Jan · The B shift calculated by WASSR over all the phantoms ranged from − to Hz Therefore WASSR data acquired at full resolution ( × ) was also applied for correction of the reconstructed data The mean and standard deviation in CEST contrast (WASSR corrected) from the full resolution dataset are used as a "gold standard "
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Quantitative magnetic susceptibility mapping without …
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Non-invasive temperature mapping using temperature-responsive …
Both the T-WASSR spectra and the H NMR spectra show that the lipid PRF is insensitive to temperature changes allowing a determination of absolute temperature using the lipid PRF as an internal reference Similar to water PRF mapping fitting the fat saturation spectral images pixel-by-pixel allows mapping the lipid PRF at high spatial
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Water saturation shift referencing (WASSR) for chemical exchange
Apr · WASSR shift maps and quantification of glycoCEST MTR asym as a function of number of WASSR points for the glycogen phantom WASSR data initially acquired with points within ppm (± ppm) were rearranged with three sets of WASSR data as follows four points within ppm eight points within ppm and points within ppm
Basics of Chemical Exchange Saturation Transfer …
Dec · Chemical exchange saturation transfer (CEST) is one of the contrast mechanisms in magnetic resonance imaging (MRI) and has been used to detect dilute proteins through the interaction between bulk water …
Improvement of water saturation shift referencing by
Jul · The first volunteer underwent an MRI examination of the brain Signal reception was performed with a -channel birdcage head coil The MR protocol (protocol ) included a localizer a CEST sequence for APT-CEST imaging two WASSR data acquisitions with different B -amplitudes of the Gaussian-shaped presaturation pulse and to differentiate …
Improvement of water saturation shift referencing by …
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Water saturation shift referencing (WASSR) for chemical exchange
Jun · WASSR shift maps and quantification of glycoCEST MTR asym as a function of number of WASSR points for the glycogen phantom WASSR data initially acquired with thirty-three points within ppm (± ppm) were rearranged with three sets of WASSR data as following four points within ppm eight points within ppm and sixteen points
Quantitative magnetic susceptibility mapping without phase …
Feb · WASSR uses direct saturation of water protons as a function of frequency irradiation offset to generate frequency maps without phase wraps which can be combined with any image or spectroscopy acquisition By utilizing a series of fast short-echo-time direct saturation images with multiple radiofrequency offsets a frequency correction for
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Improvement of water saturation shift referencing by …
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WAter Saturation Shift Referencing (WASSR) for chemical …
Chemical exchange saturation transfer (CEST) is a contrast mechanism exploiting exchange-based magnetization transfer (MT) between solute and water protons CEST effects compete with direct water saturation and conventional MT processes and generally
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In vivo imaging of phosphocreatine with artificial neural networks
Feb · The B map was obtained via the WASSR method in which offsets from − to ppm were collected with acquisition parameters and geometry identical to other CEST experiments The
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Exploring a New Approach for Measuring Water Vapor on Earth
Jul · The WASSR team is building the first active terahertz radar sensor that uses its own GHz signal source to measure water vapor in a planetary environment such as Mars Some technological advances of WASSR s design newly developed in the last year include a transmitter capable of providing more than mW of continuous power a receiver