Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Aug 2012
Test-retest stability analysis of resting brain activity revealed by blood oxygen level-dependent functional MRI.
To assess test-retest stability of four functional magnetic resonance imaging (fMRI)-derived resting brain activity metrics: the seed-region-based functional connectivity (SRFC), independent component analysis (ICA)-derived network-based FC (NTFC), regional homogeneity (ReHo), and the amplitude of low frequency fluctuation (ALFF). ⋯ SRFC, ReHo, and ALFF are robust to random noise interference. The neighborhood size for calculating ReHo should be larger than 20 voxels. ICC > 0.5 and cluster size > 11 should be used to assess the ICC maps for ACC/PCC SRFC, ReHo, and ALFF. BOLD fMRI-based SBA can be reliably measured using ACC/PCC SRFC, ReHo, and ALFF after 2 months.
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J Magn Reson Imaging · Aug 2012
Free-breathing 3D whole-heart black-blood imaging with motion sensitized driven equilibrium.
To assess the efficacy and robustness of motion sensitized driven equilibrium (MSDE) for blood suppression in volumetric 3D whole-heart cardiac MR. ⋯ MSDE-prep allows volumetric black-blood imaging of the heart.
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J Magn Reson Imaging · Aug 2012
Development and evaluation of TWIST Dixon for dynamic contrast-enhanced (DCE) MRI with improved acquisition efficiency and fat suppression.
To develop a new pulse sequence called time-resolved angiography with stochastic trajectories (TWIST) Dixon for dynamic contrast enhanced magnetic resonance imaging (DCE-MRI). ⋯ The results from phantom and volunteer evaluation suggest that TWIST Dixon outperforms conventional methods in almost every aspect and it is a promising method for DCE-MRI and contrast-enhanced perfusion MRI, especially at higher field strength where fat suppression is challenging.
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J Magn Reson Imaging · Aug 2012
Comparison of pulsed and pseudocontinuous arterial spin-labeling for measuring CO2 -induced cerebrovascular reactivity.
To compare the performance of pulsed and pseudocontinuous arterial spin-labeling (PASL and pCASL) methods in measuring CO(2) -induced cerebrovascular reactivity (CVR). ⋯ pCASL may be less prone to underestimation of CO(2) -induced flow changes due to improved label timing control.
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J Magn Reson Imaging · Aug 2012
Correlation of volume transfer coefficient Ktrans with histopathologic grades of gliomas.
To evaluate the roles of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) and optimum tracer kinetic parameters in the noninvasive grading of the glial brain tumors with histopathological grades (I-IV). ⋯ K(trans) is the most sensitive and specific parameter in noninvasive grading, distinguishing the high (III and IV) from the low (I and II) grade and high grade III from low grade II gliomas.