David E. Kuhal

 The concept of emission and transmission tomography was introduced by David E. Kuhal and Roy Edwards in the 1950s at the University of Pennsylvania.. 

worked to develop the use of FDG metabolism scanning in human brains.

REFERENCES:

https://www.researchgate.net/profile/Kenneth_Krohn/publication/6774015/figure/fig1/AS:598317515931649@1519661420438/Diagram-of-FDG-metabolism-compared-to-glucose-metabolism.png

https://collection.valeiapp.com/forum/PET-scan-history-74fab5