Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Dec 2008
Comparative StudyComparison of 2D and multislab 3D magnetic resonance techniques for measuring carotid wall volumes.
To compare a multislab three-dimensional volume-selective fast spin-echo (FSE) magnetic resonance (MR) sequence with a routine two-dimensional FSE sequence for quantification of carotid wall volume. ⋯ Multislab volume selective 3D FSE carotid arterial wall imaging performs similarly to a conventional 2D technique, but with over twice the SNR and substantially reduced scan time.
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J Magn Reson Imaging · Dec 2008
Revisiting anaplastic astrocytomas II: further characterization of an expansive growth pattern with visually enhanced diffusion tensor imaging.
To seek to distinguish and visualize the different magnetic resonance imaging (MRI) growth patterns among malignant gliomas utilizing visually enhanced diffusion tensor imaging (DTI). ⋯ We have successfully developed software that visually enhances the anatomic details of the tumor/fiber interface in patients with anaplastic astrocytomas. These data support the existence of a subgroup of patients within the WHO Grade III classification with expansive tumors and a significantly better prognosis.
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J Magn Reson Imaging · Dec 2008
Free-breathing high-spatial-resolution delayed contrast-enhanced three-dimensional viability MR imaging of the myocardium at 3.0 T: a feasibility study.
To assess the feasibility of free-breathing high-spatial-resolution delayed contrast-enhanced three-dimensional (3D) viability magnetic resonance imaging (MRI) at 3.0 T for the detection of myocardial damages. ⋯ Free-breathing high-spatial-resolution delayed contrast-enhanced 3D viability MRI using 3.0 T was feasible for the evaluation of hyperenhancing myocardium, as seen with myocardial infarction and cardiomyopathies.
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J Magn Reson Imaging · Dec 2008
Revisiting anaplastic astrocytomas I: an expansive growth pattern is associated with a better prognosis.
To study whether anaplastic astrocytomas that are nonenhancing and/or well-circumscribed (expansive) are associated with a better prognosis. ⋯ Circumscribed growth in histologically proven anaplastic astrocytoma, which has not been emphasized in past studies, has a considerable survival advantage.
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J Magn Reson Imaging · Dec 2008
Comparative StudyHead-to-head comparison between delayed enhancement and percent infarct mapping for assessment of myocardial infarct size in a canine model.
To compare a novel method, percent-infarct-mapping (PIM), with conventional delayed enhancement (DE) of contrast for accurate myocardial viability assessment. Contrary to signal intensity (SI), the longitudinal relaxation-rate enhancement (DeltaR1) is an intrinsic parameter linearly proportional to the concentration of contrast agent (CA). Determining DeltaR1 voxel-by-voxel, after administering an infarct-avid CA, allows determination of per-voxel percentage of infarcted tissue. The feasibility of generating PIM is demonstrated in canine reperfused infarction using an infarct-avid, persistent-CA (PCA), (Gd)(ABE-DTTA). PIM is compared to the DE method using Gd(DTPA), and both to triphenyltetrazolium chloride (TTC) staining histochemistry. ⋯ The DeltaR1-based PIM method is highly reproducible and more accurate than DE for quantifying myocardial viability in vivo.