AJNR. American journal of neuroradiology
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AJNR Am J Neuroradiol · Feb 2005
Diffusion-weighted imaging abnormalities after percutaneous transluminal angioplasty and stenting for intracranial atherosclerotic disease.
The literature contains relatively few reports of distal embolism associated with intervention for intracranial atherosclerotic disease. Our purpose was to evaluate the frequency of thromboembolic events after percutaneous transluminal angioplasty (PTA) or stent placement in this setting by using diffusion-weighted (DW) imaging. ⋯ In this series, PTA or stent placement or both for intracranial atherosclerotic lesions was safe. New DW imaging abnormalities were less frequent in patients who underwent PTA alone or primary stent placement than in those receiving PTA followed by stent placement.
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AJNR Am J Neuroradiol · Jan 2005
Relationship between transcranial Doppler and CT data in acute intracerebral hemorrhage.
It would be useful to have a noninvasive test for correlation with CT findings in patients with intracerebral hemorrhage (ICH). We determined which transcranial Doppler (TCD) variables are related to which CT data in patients with ICH. ⋯ Most TCD parameters were correlated with CT data in the acute stage of ICH. An increase in PI probably reflects intracranial hypertension and mass effect. Further studies are needed to determine the clinical application of our findings.
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AJNR Am J Neuroradiol · Jan 2005
Comparative StudyAccuracy of dynamic perfusion CT with deconvolution in detecting acute hemispheric stroke.
Dynamic perfusion CT (PCT) with deconvolution produces maps of time-to-peak (TTP), mean transit time (MTT), regional cerebral blood flow (rCBF), and regional cerebral blood volume (rCBV), with a computerized automated map of the infarct and penumbra. We determined the accuracy of these maps in patients with suspected acute hemispheric stroke. ⋯ Dynamic PCT maps are more accurate than nonenhanced CT in detecting hemispheric strokes. Despite limited spatial coverage, PCT is highly reliable to assess the stroke extent.
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AJNR Am J Neuroradiol · Jan 2005
Quantitative proton MR spectroscopic findings of cortical reorganization in the auditory cortex of musicians.
Brain has a capacity for reorganization that enables use-dependent adaptations to acquire skills. Previous studies demonstrated morphometric and functional use-dependent changes in the brains of musicians. The purpose of this study was to investigate the differences in metabolite concentrations in the planum temporale, an area strongly associated with the processing of music perception, between trained musicians and non-musicians. We hypothesized that the microscopic changes leading to use-dependent adaptations in brain might cause neurometabolite changes that could be detected with quantitative proton MR spectroscopy. ⋯ Long-term, professional musical activity caused significant changes in the neurometabolite concentrations that might reflect the physiologic mechanism(s) of use-dependent adaptation in the brains of musicians.
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While both fluoroscopic and CT-guidance during cervical nerve root blocks have been well documented in the literature, the use of CT fluoroscopy (CTF) has not. CTF is well suited to provide imaging guidance during these procedures due to its combination of excellent anatomic detail, relatively low radiation dose and the ability to perform an initial dynamic contrast injection, and is a viable alternative to fluoroscopic guidance. Details of the technique along with the initial experience at one institution are presented.