Figure 7.

Chronology plots showing the significant ‘developmental and methodological' outcomes in brain PET and the reporting of ‘achievement' outcomes of new or consensus changing information on the human brain. Only one reference for a given outcome is scored. This analysis has not been based on a systematic review of the literature but on the references contained in this review. A large and important area of methodological developments is not directly represented, namely those that have occurred in radio synthetic chemistry, cyclotrons, and their production targetry.