Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Nov 2008
Effective motion-sensitizing magnetization preparation for black blood magnetic resonance imaging of the heart.
To investigate the effectiveness of flow signal suppression of a motion-sensitizing magnetization preparation (MSPREP) sequence and to optimize a 2D MSPREP steady-state free precession (SSFP) sequence for black blood imaging of the heart. ⋯ Velocity encoding is the primary flow suppression mechanism of the MSPREP sequence and 2D MSPREP-SSFP black blood imaging of the heart is feasible in healthy subjects.
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J Magn Reson Imaging · Nov 2008
Measurement of liver stiffness with two imaging techniques: magnetic resonance elastography and ultrasound elastometry.
To cross-validate the magnetic resonance elastography (MRE) technique with a clinical device, based on an ultrasound elastometry system called Fibroscan. ⋯ This study shows why MRE should be investigated beyond the Fibroscan. The MRE technique provided elasticity of the entire liver, meanwhile the Fibroscan provided values of elasticity locally.
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J Magn Reson Imaging · Nov 2008
Minimum detectable change in motor and prefrontal cortex activity over repeated sessions using 3T functional MRI and a block design.
To determine the minimum detectable change (MDC) in functional magnetic resonance imaging (fMRI) measurements of brain activity over repeated sessions with 95% confidence using a block design of tasks. ⋯ fMRI measurements that quantify the strength of activity in response to tasks and centers of mass offer sensitive measurements of change over repeated imaging sessions. fMRI can be used for serial investigations of individual participants using simple motor and cognitive tasks using a simple block design.
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J Magn Reson Imaging · Nov 2008
Ex vivo diffusion tensor imaging and quantitative tractography of the rat spinal cord during long-term recovery from moderate spinal contusion.
To characterize DTI metric changes throughout the length of the entire spinal cord from the acute through chronic stages of spinal cord injury (SCI). ⋯ Results from the current study support the hypothesis that the spinal cord undergoes continual changes during recovery from SCI.
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J Magn Reson Imaging · Nov 2008
Safety of localizing epilepsy monitoring intracranial electroencephalograph electrodes using MRI: radiofrequency-induced heating.
To investigate heating during postimplantation localization of intracranial electroencephalograph (EEG) electrodes by MRI. ⋯ MRI for intracranial electrode localization can be performed safely at both 1.5T and 3T provided a head-transmit coil is used, electrode leads are separated, and scanner-reported SARs are limited as determined in advance for specific scanner models, RF coils and implant arrangements. Neglecting these restrictions may result in tissue injury.