[Cerebral perfusion imaging with N-isopropyl-(123I) P-iodoamphetamine (123I-IMP): its planar imaging and semiquantitative analysis in cases with internal carotid occlusion].

Occlusion of internal carotid artery (ICA) is one of the most common cause of stroke, and the single common arterial lesion considered for extraintracranial bypass. The symptoms of ICA occlusion are not uniform; some shows transient ischemic attacks (TIAs), others completed stroke at the onset. So, measurement of cerebral blood flow might be needed to evaluate the prognosis, or to select surgical candidate in ICA occlusion. Several methods, such as Xe-133 intracarotid method, Xe-133 inhalation method etc, have been applied for the assessment of cerebral blood flow in cases with ICA occlusion. No previous report was found by the newly developed 123I-IMP in this connection. The purpose of the present study is first to demonstrate the feasibility of 123I-IMP planar brain scintigraphy and its semiquantitative analysis in 17 cases with ICA occlusion. After intravenous injection of 3 mCi of 123I-IMP, brain scintigrams were obtained from anterior, Towne, vertex, posterior, right lateral and left lateral views, and were recorded on magnetic tape and Poraloid films. Semiquantitative analysis was performed as a percent index of asymmetry (PIA) from the difference of each hemispheric count in the scintigrams by use of on-lined minicomputer system. Clinical manifestations of these 17 cases were, completed stroke in 10, TIAs in 4, and no neurological symptom in 3. 123I-IMP brain scintigrams demonstrated low flow lesion in 10 out of 10 completed stroke, in 2 out of 4 TIAs and normal perfusion in all cases with no neurological symptoms.(ABSTRACT TRUNCATED AT 250 WORDS)