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Related Experiment Videos

Brain motion: measurement with phase-contrast MR imaging.

D R Enzmann1, N J Pelc

  • 1Department of Radiology, Stanford University School of Medicine, CA 94305-5105.

Radiology
|December 1, 1992
PubMed
Summary

Healthy volunteers showed subtle brain motion during the cardiac cycle. Central brain structures moved caudally, while cerebral lobes moved cephalically, with cerebellar tonsils exhibiting the most displacement.

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Area of Science:

  • Neuroscience
  • Medical Imaging
  • Physiology

Background:

  • The brain is subject to pulsatile motion driven by the cardiac cycle.
  • Understanding this motion is crucial for neurological and neurosurgical applications.

Purpose of the Study:

  • To prospectively measure and characterize brain motion during the cardiac cycle in healthy individuals.
  • To investigate the spatiotemporal patterns of brain displacement and their relationship with cerebrospinal fluid dynamics.

Main Methods:

  • Utilized phase-contrast cine magnetic resonance (MR) imaging.
  • Studied motion in major cerebral lobes, diencephalon, brain stem, cerebellum, cerebellar tonsils, and spinal cord.
  • Analyzed 10 healthy volunteers.

Main Results:

  • Observed caudal motion of central brain structures (diencephalon, brain stem, cerebellar tonsils) post-carotid systole.
  • Concurrent cephalic motion was noted in cerebral lobes and posterior cerebellum.
  • Cerebellar tonsils showed the greatest peak displacement (0.4 mm +/- 0.16).
  • Caudal motion occurred sequentially (cerebellar tonsils to diencephalon) and synchronized with cervical CSF motion.
  • Aqueductal flow oscillations were delayed relative to brain stem motion.

Conclusions:

  • Brain motion during the cardiac cycle exhibits distinct spatiotemporal patterns.
  • Cerebellar tonsil displacement is a significant component of cardiac-induced brain motion.
  • Findings provide insights into brain-CSF dynamics and may inform conditions affected by intracranial pressure variations.

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