In vivo measurement of blood oxygen saturation using magnetic resonance imaging: A direct validation of the blood oxygen level-dependent concept in functional brain imaging

✍ Scribed by E. Mark Haacke; Song Lai; Jürgen R. Reichenbach; Karthikeyan Kuppusamy; Frank G.C. Hoogenraad; Hiroshige Takeichi; Weili Lin

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 145 KB
• Volume: 5
• Category: Article
• ISSN: 1065-9471
• DOI: 10.1002/(sici)1097-0193(1997)5:5<341::aid-hbm2>3.0.co;2-3

✦ Synopsis

A novel noninvasive magnetic resonance imaging (MRI) method was developed to determine in vivo blood oxygen saturation and its changes during motor cortex activation in small cerebral veins. Specifically, based on susceptibility measurements in the resting states, pial veins were found to have a mean oxygen saturation of Y rest ϭ 0.544 Ϯ 0.029 averaged over 14 vessels in 5 volunteers. During activation, susceptibility measurements revealed an oxygen saturation change of ⌬Y susc ϭ 0.14 Ϯ 0.02. Independent evaluation from blood flow velocity measurements yielded a value of ⌬Y flow ϭ 0.14 Ϯ 0.04 for this change. These results validate the blood oxygenation level-dependent (BOLD) model in functional MRI (fMRI).