1. REG; the study of the passage of an injected tracer through the cerebral blood vessels as revealed by an external scintillation counter.
2. the recording of changes in the electric potential of the brain without direct attachment between the recording apparatus and the subject, the impulses being beamed by radio waves from the subject to the receiver.
radioencephalography(rā″dē-ō-ĕn-sĕf″ă-lŏg′ră-fē) [″ + ″ + graphein, to write]
The recording of radio waves transmitted from the brain to a receiver but without electrodes being placed on the scalp.