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Neurosurgeon and writer Henry Marsh tells the story of the revolution in medical diagnosis brought on by the advent of the CT scan. It was developed at Atkinson Morley Hospital in London, where Marsh was later to work. "CT scanning was a revolutionary breakthrough," he says. "For the first time the living brain could be made visible. Neurology and neurosurgery changed profoundly to the immeasurable benefit of patients." Producer: Neil Koenig