Explore the concept of digital twins in precision medicine through this keynote speech delivered at the 3rd International Workshop on Multiscale Multimodal Medical Imaging. Delve into the use of digital twins for virtual clinical trials and personalized healthcare delivery, with a focus on theranostic applications. Examine the role of artificial intelligence in this emerging field, and learn about the challenges and solutions for data storage, sharing, and anonymization. Gain insights into the promising future of digital twins in healthcare from Dr. Arman Rahmim's presentation at the MICCAI 2022 Conference. For a comprehensive understanding, consider watching the related video "A Brief History of Digital Phantoms: Towards Digital Twins for Precision Medicine" to trace the evolution of this technology.