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Quantifying the effect of posture on intracranial physiology in humans by MRI flow studies
Journal of magnetic resonance imaging, 2005-11, Vol.22 (5), p.591-596
Alperin, Noam
Lee, Sang H.
Sivaramakrishnan, Anusha
Hushek, Stephen G.
2005
Volltextzugriff (PDF)
Details
Autor(en) / Beteiligte
Alperin, Noam
Lee, Sang H.
Sivaramakrishnan, Anusha
Hushek, Stephen G.
Titel
Quantifying the effect of posture on intracranial physiology in humans by MRI flow studies
Ist Teil von
Journal of magnetic resonance imaging, 2005-11, Vol.22 (5), p.591-596
Ort / Verlag
Hoboken: Wiley Subscription Services, Inc., A Wiley Company
Erscheinungsjahr
2005
Quelle
Wiley Online Library Journals Frontfile Complete
Beschreibungen/Notizen
Purpose To quantify the effect of posture on intracranial physiology in humans by MRI, and demonstrate the relationship between intracranial compliance (ICC) and pressure (ICP), and the pulsatility of blood and CSF flows. Materials and Methods Ten healthy volunteers (29 ± 7 years old) were scanned in the supine and sitting positions using a vertical gap MRI scanner. Pulsatile blood and CSF flows into and out from the brain were visualized and quantified using time‐of‐flight (TOF) and cine phase‐contrast techniques, respectively. The total cerebral blood flow (tCBF), venous outflow, ICC, and ICP for the two postures were then calculated from the arterial, venous, and CSF volumetric flow rate waveforms using a previously described method. Results In the upright posture, venous outflow is considerably less pulsatile (57%) and occurs predominantly through the vertebral plexus, while in the supine posture venous outflow occurs predominantly through the internal jugular veins. A slightly lower tCBF (12%), a considerably smaller CSF volume oscillating between the cranium and the spinal canal (48%), and a much larger ICC (2.8‐fold) with a corresponding decrease in the MRI‐derived ICP values were measured in the sitting position. Conclusion The effect of posture on intracranial physiology can be quantified by MRI because posture‐related changes in ICC and ICP strongly affect the dynamics of cerebral blood and CSF flows. This study provides important insight into the coupling that exists between arterial, venous, and CSF flow dynamics, and how it is affected by posture. J. Magn. Reson. Imaging 2005. © 2005 Wiley‐Liss, Inc.
Sprache
Englisch
Identifikatoren
ISSN: 1053-1807
eISSN: 1522-2586
DOI: 10.1002/jmri.20427
Titel-ID: cdi_proquest_miscellaneous_68741197
Format
–
Schlagworte
Adaptation, Physiological - physiology
,
Adult
,
Blood Flow Velocity - physiology
,
Brain - anatomy & histology
,
Brain - blood supply
,
Brain - physiology
,
CBF
,
cerebral venous outflow
,
Cerebrovascular Circulation - physiology
,
cine phase contrast
,
CSF flow
,
Female
,
Humans
,
Image Interpretation, Computer-Assisted - methods
,
intracranial compliance and pressure
,
Intracranial Pressure - physiology
,
Magnetic Resonance Imaging - methods
,
Male
,
Posture - physiology
,
Pulsatile Flow - physiology
,
Statistics as Topic
,
upright posture
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