Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Dec 2007
MR imaging of the female pelvis at 3 Tesla: evaluation of image homogeneity using different dielectric pads.
To evaluate improvements in image homogeneity in pelvic MR imaging at 3 Tesla (T) using two different dielectric pads. ⋯ Dielectric pads consisting of either US gel or water are effective in improving image homogeneity of the pelvis on 3T MRI.
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J Magn Reson Imaging · Dec 2007
Detecting groups of coherent voxels in functional MRI data using spectral analysis and replicator dynamics.
To investigate the relationship between functional MRI (fMRI) time series in the human brain, combining fMRI spectral analysis and replicator dynamics. ⋯ The application of replicator dynamics to spectral matrices is a reliable method for detecting groups of maximally coherent voxels. A replicator process is able to determine groups of voxels with the property that each voxel in the group exhibits a high coherence with every other group member. In contrast to the NCV approach, this method is parameter-free and does not require the a priori selection of a reference voxel.
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J Magn Reson Imaging · Dec 2007
Comparative StudyDirect comparison of myocardial perfusion cardiovascular magnetic resonance sequences with parallel acquisition.
To directly compare the three main myocardial perfusion cardiovascular magnetic resonance (CMR) sequences incorporating parallel acquisition methods. ⋯ The hEPI sequence scored best for diagnostic performance despite the SSFP sequence having greater CNR. This trial favors hEPI for clinical myocardial perfusion CMR and suggests CNR should not be the sole criterion used to gauge the best candidate sequence.
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J Magn Reson Imaging · Dec 2007
Apparent diffusion coefficients in oligodendroglial tumors characterized by genotype.
To investigate whether oligodendroglial tumors with or without 1p/19q loss differ in their diffusion-weighted imaging characteristics. Oligodendroglial tumors with or without 1p/19q loss differ in their therapeutic responsiveness and prognosis, and recent reports also suggest that these tumors may differ in their magnetic resonance characteristics and blood volume. ⋯ This preliminary study identified differences in ADC and ATC between oligodendroglial tumor genotypes that may reflect underlying biology. Confirmation in a larger series is warranted.
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J Magn Reson Imaging · Dec 2007
MRI evaluation of microvascular obstruction in experimental reperfused acute myocardial infarction using a T1 and T2 preparation pulse sequence.
To investigate a T1 and T2 preparation pulse sequence to evaluate microvascular obstruction (MO) in a porcine model of reperfused acute myocardial infarction (AMI). ⋯ Using T1 preparation under a constant gadopentetate dimeglumine (Gd-DTPA) infusion, delayed imaging at 30 to 45 minutes demonstrates MO as a positive contrast with larger T1 values. Elevated T1 and T2 values in MO precontrast may also help to differentiate them from both control and DHE regions.