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OBSERVATION OF CSF PULSATILE FLOW IN MRI: THE SIGNAL VOID PHENOMENON Shigeki Ohara 1 , Takashi Matsumoto 1 , Hajime Nagai 1 , Tatsuo Banno 2 1Department of Neurosurgery, Nagoya City University Medical School 2Department of Radiology, Nagoya City University Medical School pp.991-996
Published Date 1987/10/1
DOI https://doi.org/10.11477/mf.1406205996
  • Abstract
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In a comparative study of MR images of 289 neurosurgical patients, loss of the signal intensity (signal void phenomenon) of CSF in the aqueduct was observed in 77 patients. This signal void phenomenon was seen most frequently in infants with chronic subdural hematoma (12 of 18) andpatients of all age groups suffering from com-municating hydrocephalus (10 of 14).

It is konwn that CSF in the cranial cavity flows toward the spinal CSF space in to and fro manner responding to brain parenchyma pulsations. The velocity of this flow is to be faster in the narrower parts through the ventricular systems such as the aqueduct, Monro's foramen and the 4th ventricles. We think that in T 2 weighted images signal void phenomenon reflects "high velocity signal loss" due to CSF flow. When the subarachnoid adhesions secondary to subarachnoid hemorrhage stagnate CSF flow in the subarachnoid space, the intraven-tricular CSF flow forms the main buffer for changes of the brain volume. This causes an increase in the amplitude of the pulsatile flow in the ven-tricular systems. Therefore the signal void pheno-menon in the aqueductal CSF becomes more pro-nounced.

It may be possible to differentiate normal cir-culation of CSF from abnormal with the bigger amplitude of CSF pulsatile flow, to understand the mechanisms of the normal pressure hydrocephalus or to diagnose a shunt malfunction. Therefore more insight in the CSF flow as imaged by MRI is needed, quantification of CSF flow will be the subjects of our further research.


Copyright © 1987, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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