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Fig. 1B. —Depiction of perfusion MRI technique for evaluation of
cerebral abscesses in 44-year-old man with two confluent rim-enhancing
lesions. At biopsy, lesions were shown to be due to Nocardia
organisms. Ratio of relative cerebral blood volume (rCBV) in abscess capsule
to rCBV in white matter was 0.78. This rCBV map obtained at same level as
A and derived from dynamic susceptibility imaging sequence shows that
regions on rCBV map in right frontal lobe that correspond to right frontal
lobe contrast-enhancing lesions in A have low rCBV relative to normal
gray matter and appear relatively equivalent to normal white matter.
