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Differences in Choroid Plexus Concentration of Pertechnetate Produced by Varying Time of Pertechnetate Administration and Brain Imaging

Veterans Administration Hospital and University California School of Medicine, San Diego, California

Correspondence: For reprints contact: Naomi Alazraki, V.A. Hospital, 3350 LaJolla Village Dr., San Diego, Calif. 92161.

ABSTRACT

To block effectively the uptake of pertechnetate by the choroid plexus, perchlorate may be given orally at any time before or after the injection of ^99mTc-pertechnetate if administration precedes imaging by at least 60 min. Possible routes of discharge of pertechnetate from the choroid plexuses are back into the blood directly or indirectly through secretion with newly formed CSF.