1,721,076 research outputs found
Turbo-FLAIR sequence in brain MRI
No full textTo compare a turbo-FLAIR sequence with Proton Density (PD) and T2- weighted Turbo Spin-Echo (TSE) sequences in several different brain diseases, 276 MRI examinations were performed on a 1.0 Tesla system. The positive cases were assessed for lesion detection and lesion conspicuity. Four quantitative criteria were also used to compare the contrast of the two techniques: lesion to background contrast, lesion to background contrast to noise ratio (CNR), lesion to Cerobrospinal fluid (CSF) contrast, lesion to CSF contrast to noise ratio. The turbo FLAIR sequence was found to be superior to PD and T2- weighted TSE for lesion detection: this sequence detected more lesions in 74 patients than PD and in 42 patients than T2, but missed some subtentorial lesions. For lesion conspicuity turbo-FLAIR was judged equivalent to PD and T2-weighted TSE respectively in 27% and 45% of the cases and better in 71% and 53% of the cases. Lesion to background contrast and lesion to background CNR were found to be significantly greater for turbo-FLAIR than for PD (p<0.001). Compared with T2-weighted TSE, turbo-FLAIR showed a significantly higher lesion to background contrast (p<0.001) and inferior lesion to background CNR (p<0.001). Our study indicates that turbo-FLAIR can replace PD TSE scans in most cases and can be used as a first choice sequence for cerebrovascular diseases, multiple sclerosis and for the evaluation of gliosis
Role of the corpus callosum in the interhemispheric transfer of somatosensory information: an fMRI study.
No full textPrenatal diagnosis of a vein of galen aneurysmal malformation with fetal MR imaging study.
No full textIdentification of the first and second somatic sensory areas in human cerebral cortex by functional magnetic resonance imaging
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Role of the corpus callosum in the interhemispheric transfer in the tactile modality. A case report
No full textImaging of facial injuries
No full textInjuries to the facial bones and adjacent soft tissues are common. The sheer pace of modern life with high-speed travel as well as an increasingly violent and intolerant society have made facial trauma a form of social disease from which no one is immune (Batnitzki and McMillan 1990). The combination of traffic accidents and blows sustained during fights and assaults accounts for more than 80% of all injuries to the facial skeleto
Functional topography of the corpus callosum as revealed by fMRI and behavioural studies of control subjects and patients with callosal resection
Full text linkThe concept of a topographical map of the corpus callosum (CC), the main interhemispheric commissure, has emerged from human lesion studies and from anatomical tracing investigations in other mammals. Over the last few years, a rising number of researchers have been reporting functional magnetic resonance imaging (fMRI) activation in also the CC. This short review summarizes the functional and behavioral studies performed in groups of healthy subjects and in patients undergone to partial or total callosal resection, and it is focused on the work conducted by the authors. Functional data have been collected by diffusion tensor imaging and tractography (DTI and DTT) and functional magnetic resonance imaging (fMRI), both techniques allowing to expand and refine our knowledge of the commissure. Neuropsychological test were also administered, and simple behavioral task, as imitation perspective and mental rotation ability, were analyzed. These researches added new insight on the topographic organization of the human CC. By combining DTT and fMRI it was possible to observe that the callosal crossing points of interhemispheric fibers connecting homologous primary sensory cortices, correspond to the CC sites where the fMRI activation elicited by peripheral stimulation was detected. In addition, CC activation during imitation and mental rotation performance was also reported. These studies demonstrated the presence of specific callosal fiber tracts that cross the commissure in the genu, body, and splenium, at sites showing fMRI activation, consistently with cortical activated areas. Altogether, these findings lend further support to the notion that the CC displays a functional topographic organization, also related to specific behavior
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