Software Simulation of Magnetic Resonance Imaging - Ca Da Alt N

Extending MRI to the Quantification of Turbulence - DiVA

Översikt; Cite Bibtex Detaljer. Författare: Anthony Aletras; A E Arai; Externa organisationer: National Heart Lung and Blood Displacement encoding with stimulated echoes (DENSE) with a meta-DENSE readout and RF phase cycling to suppress the STEAM anti-echo is described for reducing intravoxel dephasing signal loss. Spin dephasing under nonlinear gradients: Implications for imaging and field mapping. Magnetic Resonance in Medicine, 2012.

For visualization locally induced magnetic fields are used, which disturb the homogeneity of the main magnetic field of the MR scanner. This results in signal loss in the vicinity of the device due to intravoxel dephasing, and leads to a disturbance of Measurements of Inter- and Intravoxel Dephasing of Trabecular Bone at 7T Field Strength using a Chemical Shift-Selective. Asymmetric Spin-Echo (Chase) This leads to intravoxel dephasing, signal loss, and inaccurate ADC measurements. compensated (M =M =0) gradient waveforms to null the intravoxel phase This results in signal loss in the vicinity of the device due to intravoxel dephasing, and leads to a disturbance of the phase image. The local fields are established May 28, 2016 This was due to high velocity of CSF and subsequent turbulent flow resulting in intravoxel dephasing. Patient had normal pressure hydrocephalus reducing intravoxel dephasing signal loss. This RF phase cycling scheme, when combined with existing meta-DENSE suppression of the T1 recovering signal tively referred to as susceptibility artifact.

This RF phase cycling scheme, when combined with existing meta-DENSE suppression of the T1 recovering signal frequency pulses, intravoxel dephasing accumu- lates, making the lesions appear dark.

Software Simulation of Magnetic Resonance Imaging - Ca Da Alt N

Spin echo methods refocus the static field heterogeneities, and therefore do not have signal dropout. The relationships between contrast, artifacts and field strength are summarized in Table 1.

meta-DENSE complex acquisition for reduced intravoxel

Magnetic Resonance in Medicine, 2012. Todd Constable.

Both of these mechanisms of BOLD contrast are expected to contribute to the gradient-echo (GE) BOLD signal, while the static-dephasing mechanism makes effectively no contribution to the spin-echo (SE) BOLD signal, which is primarily sensitive to intravascular dephasing. Signal decay due to susceptibility-induced intravoxel dephasing on multiple air-filled cylinders: MRI simulations and experiments.
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Signal decay due to susceptibility-induced intravoxel dephasing on multiple air-filled cylinders: MRI simulations and experiments.
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meta-DENSE complex acquisition for reduced intravoxel

Phantom and human images are provided to mechanism is intravoxel dephasing: Luminal blood contains spins travelingatvaryingvelocities(eg,duetolaminarflow).Betweenthe time of excitation and readout, these spins move through the mag-netic field gradients at different rates, resulting in intravoxel phase dispersion with signal loss.8 One may further exploit the intravoxel This paper addresses one of the major problems in interventional magnetic resonance imaging (MRI): the visualization of interventional devices. For visualization locally induced magnetic fields are used, which disturb the homogeneity of the main magnetic field of the MR scanner.

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Journal of Magnetic Resonance - Research Outputs - Lund

Authors: Anthony Aletras; A E Arai; External organisations: National Heart Lung and Blood Institute; Research areas and keywords 2012-04-01 2004-08-01 intravoxel dephasing effect is mainly along the slice selec-tion direction and is termed the slice dephasing artifact.