https://www.theregister.co.uk/2017/08/04/win7_brain_scanners_hacked/

Hackers can exploit trivial flaws in network-connected Siemens' medical scanners to run arbitrary malicious code on the equipment.

These remotely accessible vulnerabilities lurk in all of Siemens' positron emission tomography and computed tomography (PET-CT) scanners running Microsoft Windows 7. These are the molecular imaging gizmos used to detect tumors, look for signs of brain disease, and so on, in people. They pick up gamma rays from radioactive tracers injected into patients, and perform X-ray scans of bodies.