It is an objective of the present invention to provide a positron tomography method applicable to the diagnosis of specific brain diseases and to provide a positron-emitting compound for use in the method. The present invention method relates to a positron tomography method for measuring a distribution and concentration of a positron-emitting source, and is characterized in using the compound (I) as the positron-emitting source. \n [wherein, R represents a C 1-6 alkyl group or a halogen atom group, having positron-emitting capability]
POSITRON TOMOGRAPHY METHOD AND POSITRON-EMITTING COMPOUND TO BE USED THEREIN