taxibabe, it seems you overthought this and missed he obvious right in front of you.
Follow some of the links posted here recently and see that coronary PET scans are being validated as providing more useful information with less radiation exposure than the current industry standard, SPECT imaging. This company has been at the forefront of developing the software with leading researchers, including Lance Gould, MD at the University of Texas: https://www.uth.tmc.edu/pet/about-dr-gould.htm
News 
Market Data 
Discover 
