The History of Computerized Tomography (CT)

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timeline

It all started in...

1917Johann Radon, an Austrian mathematician, invented the Radon Transform, which showed the mathematical theory behind computed tomographic.

1930sTomography was being developed.

1960s – Several researchers had worked independently on cross-sectional imaging.

1967Sir Godfrey Hounsfield invented the first commercially viable CT scanner.

1971 – The first patient brain scan was done at Atkinson Morley Hospital in England, where the first EMI scanner was installed.

1972 – The first scanner installation and patient brain scan was publically announced.

1973 – The first clinical scan in the USA was performed at the Mayo Clinic.

1975 – EMI was marketing a body scanner, the first of which was installed at Northwick Park Hospital in London. The first body scanner in the USA was installed at the Mallinkrodt Institute.

1976 – At this time, 17 different companies were offering scanners.

1978 – At this time, around 200 scanners had been installed in the USA. 

1979 – Godfrey Hounsfield and Allan McLeod Cormack, who invented a similar process, were both awarded the Nobel Prize in Medicine.

1980s – Notable improvements occurred throughout the 80s including shorter scan time and increased matrix size. Towards the end of the 80s, scan times were down to only 3 seconds.

1990s – CT scanners were divided into two main divisions, “Fixed CT” and “Portable CT”. A fixed CT scanner is large, requiring a complex power supply, and is not easily transferable. A portable CT scanner or transportable scanner is small, lightweight, and easily transferable.

2008 – Siemens introduced a new generation of scanner. This scanner was able to take an image in less than one second.





images

Johann Radon

Portrait of Johann Radon about 1920.



RIMG0277

The very first ct scanner prototype. Invented by Hounsfield at EMI. This picture was taken at the UKRC 2005 exhibition in Manchester G-MEX centre. Philipcosson 08:42, 20 July 2006 (UTC) Image uploaded from the English Wikipedia.





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