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A simplified technique that uses two radionuclide tracers has been devised to measure local cerebral glucose utilization (lCGU) and local cerebral blood flow (lCBF) in the same rat. The method employs [ 14 C]-2-deoxyglucose and [ 14 C]iodoantipyrine to produce an autoradiogram before and another after extraction into chloroform of the [ 14 C]iodoantipyrine from the brain sections. The chloroform-extracted autoradiogram yields lCGU, and the difference in tissue carbon-14 concentration between the two autoradiograms permits calculation of lCBF. The double-isotope technique provides values of lCGU and lCBF that are statistically indistinguishable from those derived from conventional single-isotope methods.

journal of cerebral blood flow and metabolism

Simultaneous Measurement of Local Glucose Utilization and Blood Flow in the Rat Brain: An Autoradiographic Method Using Two Tracers Labeled with Carbon-14