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Chlormerodrin-¹⁹⁷Hg Brain Scanning: Selecting the Optimal Interval between Isotope Administration and Scanning

Mayo Clinic and Mayo Foundation, Rochester, Minnesota

ABSTRACT

Twenty-five patients with abnormal uptake on brain scans made with chlormerodrin-¹⁹⁷Hg were studied to determine the optimal interval between isotope administration and scanning. Twenty patients had tumors, and five had cerebral infarcts. Eighteen of the 20 tumors had optimal tumor-to-non-tumor ratios of counting rates 3–5 hr after injection. All five cerebral infarcts were optimally displayed 3–5 hr after injection. None of the counting times was extended beyond 5 hr.