Use of Innovative SPECT Techniques in the Presurgical Evaluation of Patients with Nonlesional Extratemporal Drug-Resistant Epilepsy

Figure 1

Time activity curve for Tc-99m HMPAO (corrected for radioactive decay). Note that all brain uptake has occurred by the first 60 seconds after IV injection and then very little loss of tracer molecules occurred over hours (counts decreasing mainly by radioactive 6-hour half-life decay of Tc-99m).