In 1971, the CT scanner was invented by South African physicist Allan Cormack and British engineer Sir Godfrey Hounsfield.

It was a ground-breaking moment in modern medicine and they're now in almost every hospital around the world.

Rachel Naylor speaks to Allan's son, Robert Cormack.

Eye-witness accounts brought to life by archive. Witness History is for those fascinated by the past. We take you to the events that have shaped our world through the eyes of the people who were there. For nine minutes every day, we take you back in time and all over the world, to examine wars, coups, scientific discoveries, cultural moments and much more.

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(Photo: A patient receiving a CT scan in 1977. Credit: Getty Images)