Journal of magnetic resonance imaging : JMRI
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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.
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J Magn Reson Imaging · Nov 2008
Comparative StudyAbility of diffusion-weighted imaging for the differential diagnosis between chronic expanding hematomas and malignant soft tissue tumors.
To evaluate the potential of diffusion-weighted imaging (DWI) in distinguishing chronic expanding hematomas (CEHs) from malignant soft tissue tumors. ⋯ DWI is useful for differentiating between CEHs and malignant soft tissue tumors.
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J Magn Reson Imaging · Nov 2008
Inflow quantification in three-dimensional cardiovascular MR imaging.
To investigate blood inflow enhancement (or lack thereof) in three-dimensional (3D) cardiovascular MR for both single phase whole-heart and cine biventricular functions. ⋯ There is significant loss of CNR between blood and myocardium when using larger 3D slabs due to saturation of inflowing spins. The loss of contrast is less pronounced for SSFP than for GRE, though both acquisition techniques suffer.