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Quantitative T1 mapping under precisely controlled graded hyperoxia at 7T.

Alex A Bhogal1, Jeroen Cw Siero1, Jaco Zwanenburg1

  • 11 Department of Radiology, University Medical Center Utrecht, Utrecht, The Netherlands.

Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
|June 30, 2016
PubMed
Summary
This summary is machine-generated.

Hyperoxia, or high oxygen levels, did not change brain tissue T1 relaxation times. However, T1 relaxation in cerebrospinal fluid decreased with increasing end-tidal oxygen, highlighting potential confounds in T1-weighted imaging studies.

Keywords:
Brain imagingcerebral hemodynamicscerebrospinal fluidmagnetic resonance imagingneurophysiology

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Area of Science:

  • Biomedical Engineering
  • Neuroimaging
  • Physiology

Background:

  • Increasing dissolved oxygen in water enhances longitudinal magnetization recovery (T1 relaxation).
  • The direct impact of hyperoxia on brain tissue T1 relaxation and arterial oxygen concentration remains insufficiently quantified.
  • Understanding T1 changes under hyperoxia is crucial for accurate neuroimaging interpretation.

Purpose of the Study:

  • To quantitatively measure T1 changes in brain tissue and cerebrospinal fluid (CSF) during precisely controlled hyperoxic challenges.
  • To investigate the relationship between end-tidal oxygen (PetO2) and T1 relaxation in gray matter, white matter, and CSF.
  • To clarify the effects of increased arterial oxygen on brain parenchyma T1 values.

Main Methods:

  • Quantitative T1 mapping was employed to assess T1 relaxation times.
  • Hyperoxic respiratory challenges were administered, ranging from baseline PetO2 to approximately 500 mmHg.
  • T1 values were measured in gray matter, white matter, ventricular CSF, and sulcal CSF.

Main Results:

  • No significant T1 changes were observed in either gray or white matter brain parenchyma.
  • T1 relaxation time of peripheral CSF within the sulci decreased proportionally with increasing PetO2.
  • Ventricular CSF showed no significant T1 changes under hyperoxic conditions.

Conclusions:

  • Hyperoxia does not induce measurable T1 changes in brain parenchyma.
  • T1 reduction in peripheral CSF under hyperoxia may be misinterpreted as parenchymal changes in T1-weighted imaging.
  • Distinguishing CSF-related partial volume effects or edema is critical when interpreting hyperoxia-induced T1 alterations.