Journal of magnetic resonance imaging : JMRI
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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
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
Alteration of blood oxygenation level-dependent signaling by local circulatory condition.
To determine regional differences in the relationship between neuronal activation and blood oxygenation level-dependent (BOLD) signal changes. ⋯ Insufficient perfusion pressure in these regions may have led to attenuation of BOLD and perfusion responses to stimulation of a large portion of the visual field, or a condition in which a large extent of the visual areas was activated in the proximal regions of the territories perfused by the middle and posterior cerebral arteries. This finding supports the hypothesis that regional differences in circulatory condition can result in alterations of the relationship between neuronal activation and BOLD signal changes in the normal human brain.
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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.
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J Magn Reson Imaging · Dec 2007
Black-blood imaging of the human heart using rapid stimulated echo acquisition mode (STEAM) MRI.
To develop a rapid stimulated echo acquisition mode (STEAM) MRI technique for "black-blood" imaging of the human heart that overcomes the single-slice limitation and partially compromised blood suppression associated with double inversion-recovery techniques. ⋯ Rapid STEAM MRI of the heart emerges as a simple technique for multislice imaging of the myocardial wall with efficient flow suppression.