I-123 IMP, Tc-99m PAO SPECT and stable Xe-CT were performed in patients with cerebral infarction. I-123 IMP and Tc-99m PAO SPECT seemed to be superior to stable Xe-CT in detectability and delineation of the lesion. We obtained similar information in these cases by I-123 IMP and Tc-99m PAO SPECT.