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FIG 1. Scanning protocol for SPECT. At 5 minutes after injection of the first dose of 99mTc-HMPAO, the first scan (acquisition time, 20 minutes) starts for resting CBF imaging. At 8 minutes after the start of the first scan (ie, 12 minutes before the second HMPAO injection), 1 g of acetazolamide is administered. At the end of the first scan, the second dose of 99mTc-HMPAO is injected, and the second scan for postacetazolamide CBF imaging starts 5 minutes later
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