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The Xbox Kinect was built to track a player’s body without controllers, using infrared depth sensing to understand where someone was and how they were moving in three dimensions. That inexpensive technology ended up being useful far beyond video games. Researchers began experimenting with actual Microsoft Kinect cameras in medicine, including mounting one directly above a CT scanner to create a 3D map of a patient’s body. The depth information could be used to estimate body size and positioning without relying entirely on manual measurements. Modern commercial CT systems have taken the same basic idea much further. Siemens Healthineers, for example, uses an infrared 3D camera and AI to identify a patient’s body shape, height and position before a scan, automatically helping place them at the correct point inside the scanner and select the appropriate scan area. The cameras inside today’s CT scanners are not simply Xbox Kinects bolted to hospital equipment, but the kind of low-cost 3D body sensing that Kinect helped popularise has become useful technology in medical imaging.