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  • Title: Delayed ischemia due to cerebral vasospasm occult to transcranial Doppler. An important role for cerebral perfusion SPECT.
    Author: Lewis DH, Newell DW, Winn HR.
    Journal: Clin Nucl Med; 1997 Apr; 22(4):238-40. PubMed ID: 9099480.
    Abstract:
    Cerebral vasospasm after subarachnoid hemorrhage is very common, but it is not universally detectable by transcranial Doppler. SPECT imaging of regional cerebral blood flow with Tc-99m exametazime serves as a complementary test to transcranial Doppler in the evaluation of patients at high risk for vasospasm. The significance of vasospasm, which may be underestimated by TCD, is readily identified with SPECT cerebral perfusion imaging.
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