AJNR. American journal of neuroradiology
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AJNR Am J Neuroradiol · Jun 2007
Differentiation of glioblastoma multiforme and single brain metastasis by peak height and percentage of signal intensity recovery derived from dynamic susceptibility-weighted contrast-enhanced perfusion MR imaging.
Glioblastoma multiforme (GBM) and single brain metastasis (MET) are the 2 most common malignant brain tumors that can appear similar on anatomic imaging but require vastly different treatment strategy. The purpose of our study was to determine whether the peak height and the percentage of signal intensity recovery derived from dynamic susceptibility-weighted contrast-enhanced (DSC) perfusion MR imaging could differentiate GBM and MET. ⋯ The findings of our study show that the peak height and the percentage of signal intensity recovery derived from the Delta R2* curve of DSC perfusion MR imaging can differentiate GBM and MET.
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AJNR Am J Neuroradiol · Jun 2007
Comparative StudyEmergent headaches during pregnancy: correlation between neurologic examination and neuroimaging.
Emergent evaluation of the pregnant headache patient requires rational selection of acute neuroimaging studies, yet guidelines do not exist. We investigated the demographic and clinical features that are predictive of intracranial pathologic lesions on neuroimaging studies in pregnant women with emergent headaches. ⋯ Emergent neuroimaging studies may reveal an underlying headache etiology in 27% of pregnant women. Further research with a larger sample size is needed to determine what clinical factors are predictive of a pathologic condition on neuroimaging studies.
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AJNR Am J Neuroradiol · Jun 2007
Pseudolesions arising from unfolding artifacts in diffusion imaging with use of parallel acquisition: origin and remedies.
Diffusion imaging acquired with echo-planar imaging (EPI) is usually performed with parallel imaging to reduce geometric distortions, especially at high fields. This study reports the occurrence of pseudolesions in EPI with parallel imaging. The unfolding artifacts are attributed as arising from a mismatch between RF sensitivity profiles and distorted acquisition data in the presence of susceptibility effects, plus strong signals on the b=0 images. Examples of pseudolesions from the eyeballs are shown, and remedies are suggested.