Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Aug 2009
Comparative StudyUsefulness of the application of the BLADE technique to reduce motion artifacts on navigation-triggered prospective acquisition correction (PACE) T2-weighted MRI (T2WI) of the liver.
To evaluate the effects of the application of the BLADE (Siemens, Siemens Medical Systems, Erlangen, Germany) technique, a technique to reduce motion artifacts, on navigator-triggered prospective acquisition correction (PACE) T2-weighted MRI (T2WI) of the liver. ⋯ The BLADE technique could improve image quality by reducing motion artifacts on hepatic MRI without affecting the diagnostic performance.
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J Magn Reson Imaging · Jul 2009
Multicenter StudyMulticenter validation of the magnetic resonance T2* technique for segmental and global quantification of myocardial iron.
To assess the transferability of the magnetic resonance imaging (MRI) multislice multiecho T2(*) technique for global and segmental measurement of iron overload in thalassemia patients. ⋯ The multislice multiecho T2(*) technique is transferable among scanners with good reproducibility.
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J Magn Reson Imaging · Jul 2009
Impact of cerebrospinal fluid contamination on brain metabolites evaluation with 1H-MR spectroscopy: a single voxel study of the cerebellar vermis in patients with degenerative ataxias.
To investigate the impact of cerebrospinal fluid (CSF) contamination on metabolite evaluation in the superior cerebellar vermis with single-voxel (1)H-MRS in normal subjects and patients with degenerative ataxias. ⋯ CSF contamination has a not negligible effect on the estimation of brain metabolites. The increase of Cr concentration in patients with cerebellar atrophy presumably reflects the substitutive gliosis which takes place along with loss of neurons.
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J Magn Reson Imaging · Jul 2009
SAR and power implications of different RF shimming strategies in the pelvis for 7T MRI.
To determine the best radiofrequency (RF) shimming method for 7 T body imaging that provides sufficient B(1)(+) excitation inside the target region while energy deposition (SAR) and power demands are as low as possible and that does not incorporate anatomy specific electric field information inside the patient models, as this information is not available in practice. ⋯ RF shimming can reduce the SAR and improve power efficiency in an accurate patient model without knowing the electric field. However, choosing the right method is critical to prevent unexpected behavior in local SAR deposition.
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J Magn Reson Imaging · Jul 2009
Automatic glioma characterization from dynamic susceptibility contrast imaging: brain tumor segmentation using knowledge-based fuzzy clustering.
To assess whether glioma volumes from knowledge-based fuzzy c-means (FCM) clustering of multiple MR image classes can provide similar diagnostic efficacy values as manually defined tumor volumes when characterizing gliomas from dynamic susceptibility contrast (DSC) imaging. ⋯ Our results suggest that knowledge-based FCM clustering of multiple MR image classes provides a completely automatic, user-independent approach to selecting the target region for presurgical glioma characterization.