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Cerebrospinal Fluid01:21

Cerebrospinal Fluid

Cerebrospinal fluid (CSF) is a colorless liquid that flows around the brain and the spinal cord, playing a vital role in the protection, support, and overall function of the central nervous system (CNS). CSF production, circulation, and absorption are tightly regulated processes essential for the brain and spinal cord to function properly.
CSF Production
CSF is produced mainly in the choroid plexus, a network of capillaries and ependymal cells located within the ventricular system of the brain.

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MEDI+0: Morphology enabled dipole inversion with automatic uniform cerebrospinal fluid zero reference for

Zhe Liu1,2, Pascal Spincemaille1, Yihao Yao1,3

  • 1Department of Radiology, Weill Cornell Medical College, New York, New York, USA.

Magnetic Resonance in Medicine
|October 13, 2017
PubMed
Summary

A new quantitative susceptibility mapping (QSM) method, MEDI+0, establishes a consistent zero reference by minimizing cerebrospinal fluid (CSF) susceptibility variation, improving image quality and accuracy in neuroimaging.

Keywords:
CSF homogeneityQSMzero reference

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Area of Science:

  • Medical Imaging
  • Neuroscience
  • Biophysics

Background:

  • Quantitative susceptibility mapping (QSM) is crucial for neuroimaging, but establishing a consistent zero reference remains challenging.
  • Variations in cerebrospinal fluid (CSF) susceptibility can introduce artifacts and affect quantitative accuracy.

Purpose of the Study:

  • To develop a novel QSM method (MEDI+0) that utilizes minimal variation in CSF susceptibility to establish a consistent zero reference.
  • To improve the accuracy and image quality of QSM by addressing CSF susceptibility heterogeneity.

Main Methods:

  • The proposed MEDI+0 method incorporates L2-regularization to enforce CSF susceptibility homogeneity within automatically segmented ventricular CSF regions.
  • This CSF homogeneity regularization was integrated into the existing morphology enabled dipole inversion (MEDI) QSM algorithm.
  • The method was validated through numerical simulations, in vivo studies of multiple sclerosis (MS) lesions, and reproducibility assessments in healthy subjects.

Main Results:

  • MEDI+0 successfully decreased susceptibility variation within ventricular CSF and suppressed artifacts near the lateral ventricles in both simulations and in vivo experiments.
  • Numerical simulations demonstrated more accurate susceptibility quantification with MEDI+0 in deep gray matter (globus pallidus, substantia nigra) and white matter (corpus callosum, internal capsule) compared to MEDI.
  • MEDI+0 measurements of MS lesion susceptibility showed good agreement with MEDI, and both methods exhibited similar, good intrasubject reproducibility.

Conclusions:

  • QSM using a minimal variation in ventricular CSF provides a viable and consistent zero reference.
  • The MEDI+0 method enhances image quality and offers improved quantitative accuracy in neuroimaging applications.
  • This approach holds promise for more reliable and reproducible susceptibility mapping in clinical and research settings.