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To examine the reliability of quantitative positron emission tomography studies in the rat (Rat–PET), we assessed the influence of radioactivity accumulated in the Harderian glands on PET CMR glc  determination. We measured CMR glc  by PET and ex vivo dissection methods by using 2-[ 18 F]fluoro-2-deoxy-D-glucose in rats with and without focal brain ischemia. The CMR glc  values obtained by PET, after correcting with recovery coefficients, were higher than those measured by the ex vivo method at rostral slices, and reduction of the CMR glc  in the ischemic brain was not demonstrated by PET in the frontal cortex. The radioactivity accumulated in the Harderian glands prevents the quantitative determination of CMR glc  using Rat–PET.

journal of cerebral blood flow and metabolism

Positron Emission Tomography for Quantitative Determination of Glucose Metabolism in Normal and Ischemic Brains in Rats: An Insoluble Problem by the Harderian Glands