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Inflow-based vascular-space-occupancy (iVASO) MRI.

Jun Hua1, Qin Qin, Manus J Donahue

  • 1The Russell H. Morgan Department of Radiology and Radiological Science, Division of MR Research, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA. jhua@mri.jhu

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Summary
This summary is machine-generated.

A new inflow-VASO (iVASO) MRI technique significantly improves signal-to-noise ratio for cerebral blood volume (CBV) measurements. This method enhances detection of arterial CBV changes and provides faster hemodynamic response onset compared to conventional VASO.

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Area of Science:

  • Neuroimaging
  • Magnetic Resonance Imaging (MRI)
  • Physiology

Background:

  • Vascular-space-occupancy (VASO) MRI measures cerebral blood volume (CBV) changes but suffers from low signal-to-noise ratio (SNR).
  • Conventional VASO's low SNR is due to limited tissue signal recovery and CSF partial volume effects.

Purpose of the Study:

  • Introduce and validate inflow-VASO (iVASO), a novel MRI technique to enhance SNR in CBV measurements.
  • Optimize iVASO for accurate assessment of arterial/arteriolar CBV (CBV(a)) changes during neural activation.

Main Methods:

  • Developed iVASO, where only blood flowing into the slice is inverted, preserving maximal tissue and CSF signal.
  • Evaluated iVASO SNR improvements at different repetition times (TR) and determined an optimal TR range (1.5-2.5 s).
  • Assessed iVASO's ability to reflect CBV(a) changes and hemodynamic response onset during visual stimulation.

Main Results:

  • iVASO demonstrated significant SNR increases of 198% ± 12% (TR=5s) and 334% ± 9% (TR=2s) compared to VASO.
  • In the optimal TR range (1.5-2.5 s), iVASO primarily reflects CBV(a) changes, minimizing perfusion contributions.
  • At TR=2s, iVASO detected a 58% ± 7% increase in CBV(a) during visual stimulation.
  • iVASO showed a 1.2 ± 0.5 s faster hemodynamic response onset than conventional VASO.

Conclusions:

  • iVASO offers a substantial SNR improvement over conventional VASO for CBV assessment.
  • The optimized TR range allows iVASO to specifically measure arterial/arteriolar CBV changes.
  • iVASO provides a more sensitive and rapid method for detecting hemodynamic responses in the brain.