RadGPT's solution, Digital PET(tm), is an artificial-intelligence-software-as-medical-device (AI-SaMD) that digitally generates positron emission tomography images from CT scans, eliminating the need for chemico-nuclear tracers and scanners. This foundation AI model can replace traditional chemico-nuclear tracers and scanners. Digital PET(tm) has the potential to fundamentally change how radiology is conducted, making the process 10X safer, faster, more equitable and sustainable.