ABSTRACT

The classic papers by Hounsfield and his clinical colleague A m b r o s e ^ o f the Atkinson Morley Hos­ pital in Wimbledon, left the scientific community in no doubt as to the importance of this discovery. However, it was made quite clear by Hounsfield that he never claimed to have ' invented CT’ and the question as to who really did invent CT has been much debated since. According to Webb 'The original concept is credited to Radon in 1917^ ,^ whilst Oldendorf in 1961 is often quoted as having published the first laboratory X-ray CT images of a "head” phantom. What Oldendorf actually did was to rotate a head phantom (comprising a bed of nails) on a gramophone turntable and provide simultaneous translation by having an HO-gauge railway track on the turntable and the phantom on a flat truck, which was pulled slowly through a beam of X-rays falling on a detector. He showed how the internal structures in the phantom gave rise under such conditions to characteristic signals in the projections as the centre of rotation traversed the phantom relative to the fixed beam and detector. He was well aware of the medical implications of his experiment, but he did not actually generate a CT image.’