The CT Scanner Was Built at the Beatles' Record Label

Godfrey Hounsfield had no medical training. He had left school at 16, drifted through radar work in the Royal Air Force, and ended up as a research engineer at EMI, the British company best known for selling Beatles records. The label's enormous profits in the 1960s funded a small electronics-research arm, and Hounsfield, who had already helped build one of the UK's earliest transistor computers, was given room to think.

The story he liked to tell was that the idea came on a country walk in the late 1960s. He was thinking about how you could reconstruct the inside of a box if you took a lot of measurements through it from different angles. A radiologist friend mentioned that brain X-rays were terrible: a 2D shadow of overlapping bone and tissue, useless for tumors. Hounsfield realized the math he was doodling could turn many low-quality X-ray slices into a single, clean cross-section.

EMI gave him about £100,000 to start. The UK Department of Health added another £600,000 — roughly £7 million in today's money. Hounsfield's team spent four years building a scanner that fired pencil-thin X-ray beams across a head from 180 angles, fed the readings into a computer, and reconstructed the slice numerically.

On October 1, 1971, at Atkinson Morley's Hospital in Wimbledon, the prototype scanned its first patient: a woman in her early forties with a suspected brain tumor. The image showed a dark, well-defined cyst in her left frontal lobe. The scan took several minutes; the reconstruction took hours. It was unmistakable.

Hounsfield shared the 1979 Nobel Prize in Medicine with Allan Cormack, who had worked out the underlying math separately in South Africa years earlier. EMI eventually sold the medical division. The Beatles had broken up in 1970, but their royalties had quietly bought the world the brain scan.