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Fig. 1B. —Fluid-attenuated inversion recovery (FLAIR) MR images in 5-year-old boy undergoing anesthesia with halothane who received supplemental oxygen during two separate MR imaging examinations. FLAIR images obtained at level of basilar cisterns (A) and cerebral sulci (B) while patient was receiving inspired oxygen fraction of 1.0 show hyperintensity of cerebrospinal fluid (CSF) compared with brain (grade 2).