Outlining organs and tumours in a CT scan is among the most tedious jobs in medical imaging. A single scan can hold hundreds of slices. Each structure has to be traced in three dimensions, and research groups typically train a separate AI model for every organ or dataset they care about. NVIDIA's answer is VISTA-3D, a single foundation model, built with the open-source MONAI framework, that segments well over a hundred anatomical structures on its own and lets a human fix or extend its work wit...