Measurement of absolute arterial cerebral blood volume in human brain without using a contrast agent

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Abstract

Arterial cerebral blood volume (CBV a) is a vital indicator of tissue perfusion and vascular reactivity. We extended the recently developed inflow vascular-space-occupancy (iVASO) MRI technique, which uses spatially selective inversion to suppress the signal from blood flowing into a slice, with a control scan to measure absolute CBV a using cerebrospinal fluid (CSF) for signal normalization. Images were acquired at multiple blood nulling times to account for the heterogeneity of arterial transit times across the brain, from which both CBV a and arterial transit times were quantified. Arteriolar CBV a was determined separately by incorporating velocity-dependent bipolar crusher gradients. Gray matter (GM) CBV a values (n=11) were 2.04±0.27 and 0.76±0.17ml blood/100ml tissue without and with crusher gradients (b=1.8s/mm 2), respectively. Arterial transit times were 671±43 and 785±69ms, respectively. The arterial origin of the signal was validated by measuring its T 2, which was within the arterial range. The proposed approach does not require exogenous contrast agent administration, and provides a non-invasive alternative to existing blood volume techniques for mapping absolute CBV a in studies of brain physiology and neurovascular diseases.

Original languageEnglish (US)
Pages (from-to)1313-1325
Number of pages13
JournalNMR in biomedicine
Volume24
Issue number10
DOIs
StatePublished - Dec 2011

Keywords

  • Arterial blood volume
  • Arterial transit time
  • Cerebral blood volume
  • Double inversion
  • MRI
  • Perfusion
  • VASO
  • iVASO

ASJC Scopus subject areas

  • Molecular Medicine
  • Radiology Nuclear Medicine and imaging
  • Spectroscopy

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