Quantitative measurements of cerebral blood flow in rats using the FAIR technique: Correlation with previous iodoantipyrine autoradiographic studies

Nikolaos V. Tsekos, Fangyi Zhang, Hellmut Merkle, Masao Nagayama, Costantino Iadecola, Seong Gi Kim

Research output: Contribution to journalArticlepeer-review

93 Scopus citations

Abstract

Flow-sensitive alternating inversion recovery (FAIR) is a recently introduced MRI technique for assessment of perfusion that uses blood water as an endogenous contrast agent. To characterize the FAIR signal denpendency on spin tagging time (Inversion time (TI)) and to validate FAIR for cerebral blood flow (CBF) quantification, studies were conducted on the rat brain at 9.4 T using a conventional gradient-called echo sequence. The T1 of cerebral cortex am blood was found to be 1.9 and 2.2 s, respectively, and was used for CBF calculations. At short TIs (<0.8 s), the FAIR signal originates largely from vascular components with fast flows, resulting in an overestimation of CBF. For TI > 1.5 s, the CBF calculated from FAIR is independent of the spin tagging time, suggesting that the observed FAIR signal originates predominantly from tissue/capillary components. CBF values measured by FAIR with TI of 2.0 s were found in good agreement WEb those measured by the iodoantipyrine technique with autoradiography in rats under the same conditions of anesthesia and arterial pCO2. The measured pCO2 index on the parietal cortex using the FAIR technique was 6.07 ml/100 g/min per mmHg, which compares well with the pCO2 index measured by other techniques. The FAIR technique was also able to detect the regional reduction in CBF produced by middle cerebral artery occlusion in rats.

Original languageEnglish (US)
Pages (from-to)564-573
Number of pages10
JournalMagnetic Resonance in Medicine
Volume39
Issue number4
DOIs
StatePublished - Apr 1998

Keywords

  • Cerebral blood flow
  • Hypercapnia
  • MRI
  • Perfusion

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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