SIMPLE DELINEATION OF MISERY PERFUSION AREAS BY SUPERIMPOSITION OF PET ON PET IMAGES

Oxygen extraction fraction images were superimposed on cerebral blood flow images of positron emission tomography (PET) to depict the so-cal led misery perfusion area in two patients with moyamoya disease. The s uperimposed image following extra-intracranial bypass surgery was obta ined in one case, which convincingly disclosed attenuation as compared with the preoperative image. This simple PET on PET approach should f ind an application in the evaluation of misery perfusion and in assess ing operative indications for cerebral ischaemic diseases.