Estimating oxygen saturation of blood in vivo with MR imaging at 1.5 T

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<jats:title>Abstract</jats:title><jats:p>The use of magnetic resonance (MR) imaging is investigated for noninvasively estimating the oxygen saturation of human blood (%HbO<jats:sub>2</jats:sub>) in vivo by means of relaxation characteristics identified in earlier MR spectrometry studies. To this end, a sequence is presented for determining the T<jats:sub>2</jats:sub> of vascular blood in regions in which motions of the body and of the blood itself present a major challenge. With use of this sequence on a commercial 1.5‐T whole‐body imager, the relationship between the T<jats:sub>2</jats:sub> and %HbO<jats:sub>2</jats:sub> of blood is calibrated in vitro for the conditions expected in vivo. T<jats:sub>2</jats:sub> varies predictably from about 30 to 250 msec as %HbO<jats:sub>2</jats:sub> varies from 30% to 96%. T<jats:sub>2</jats:sub> values measured in situ for vascular blood in the mediastinum of several healthy subjects qualitatively reflected the behavior observed in vitro. Estimates of %HbO<jats:sub>2</jats:sub> for these vessels obtained with the in vitro calibration appear reasonable, particularly for venous blood, although difficulties arise in selecting the appropriate calibration factors. These encouraging initial results support a more systematic study of potential sources of error and an examination of the accuracy of in vivo measurements by comparison with direct measurements of %HbO<jats:sub>2</jats:sub> in vessels.</jats:p>

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