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The influence of the blood pressure on the venous cerebral flow measured by magnetic susceptibility (SWI) technique

2013-03Journal article Open access
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dc.contributor.authorMartins, Hugo
dc.contributor.authorCarreiras, Marlene
dc.contributor.authorRibeiro, Margarida
dc.contributor.authorSousa, Paulo
dc.contributor.authorSilva, Carina
dc.date.accessioned2014-07-09T14:29:43Z
dc.date.available2014-07-09T14:29:43Z
dc.date.issued2013-03
dc.description.abstractSusceptibility Weighted Image (SWI) is a Magnetic Resonance Imaging (MRI) technique that combines high spatial resolution and sensitivity to provide magnetic susceptibility differences between tissues. It is extremely sensitive to venous blood due to its iron content of deoxyhemoglobin. The aim of this study was to evaluate, through the SWI technique, the differences in cerebral venous vasculature according to the variation of blood pressure values. 20 subjects divided in two groups (10 hypertensive and 10 normotensive patients) underwent a MRI system with a SiemensĀ® scanner model Avanto of 1.5T using a synergy head coil (4 channels). The obtained sequences were T1w, T2w-FLAIR, T2* and SWI. The value of Contrast-to-Noise Ratio (CNR) was assessed in MinIP (Minimum Intensity Projection) and Magnitude images, through drawing free hand ROIs in venous structures: Superior Sagittal Sinus (SSS) Internal Cerebral Vein (ICV) and Sinus Confluence (SC). The obtained values were presented in descriptive statistics-quartiles and extremes diagrams. The results were compared between groups. CNR shown higher values for normotensive group in MinIP (108.89 Ā± 6.907) to ICV; (238.73 Ā± 18.556) to SC and (239.384 Ā± 52.303) to SSS. These values are bigger than images from Hypertensive group about 46 a.u. in average. Comparing the results of Magnitude and MinIP images, there were obtained lower CNR values for the hypertensive group. There were differences in the CNR values between both groups, being these values more expressive in the large vessels-SSS and SC. The SWI is a potential technique to evaluate and characterize the blood pressure variation in the studied vessels adding a physiological perspective to MRI and giving a new approach to the radiological vascular studies.por
dc.identifier.citationMartins H, Carreiras M, Ribeiro M, Sousa P, Silva C. The influence of the blood pressure on the venous cerebral flow measured by magnetic susceptibility (SWI) technique. J Biomed Sci Eng. 2013;6:426-34.por
dc.identifier.otherDOI:10.4236/jbise.2013.63A053
dc.identifier.urihttp://hdl.handle.net/10400.21/3700
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherSCIRPpor
dc.relation.publisherversionhttp://www.scirp.org/journal/PaperInformation.aspx?PaperID=29598#.U71Qm7GYHqwpor
dc.subjectBlood pressurepor
dc.subjectSusceptibilitypor
dc.subjectNormotensivepor
dc.subjectHypertensionpor
dc.subjectMagnetic resonancepor
dc.titleThe influence of the blood pressure on the venous cerebral flow measured by magnetic susceptibility (SWI) techniquepor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage434por
oaire.citation.startPage426por
oaire.citation.titleJournal of Biomedical Science and Engineeringpor
oaire.citation.volume6por
rcaap.rightsopenAccesspor
rcaap.typearticlepor

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