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Development of the Computed Tomography (CT) Scanner

Development of the Computed Tomography (CT) Scanner. Sue Edyvean St. George’s Hospital, London. Computed Tomography. Images ‘slices’ through the patient ‘Graphia’ – to write, to draw ‘Tomos’ – cut, incision, section ‘Computed’ – determined by mathematical methods.

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Development of the Computed Tomography (CT) Scanner

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  1. Development of the Computed Tomography (CT) Scanner Sue Edyvean St. George’s Hospital, London

  2. Computed Tomography • Images ‘slices’ through the patient • ‘Graphia’ –to write, to draw • ‘Tomos’ – cut, incision, section • ‘Computed’ – determined by mathematical methods

  3. Development of the CT Scanner • CT scanner developed at EMI Medical by Godfrey Hounsfield

  4. Development of the CT Scanner • Prototype installed at Atkinson Morley’s Hospital, Wimbledon, London

  5. Development of the CT Scanner Godfrey Hounsfield, James Ambrose • Support of Dr James Ambrose, Neuro-radiologist AMH

  6. Development of the CT Scanner • 1st clinical scan 1st October 1971

  7. British Journal of Radiology 1973 – three linked papers • Godfrey Hounsfield – EMI, inventor of clinical CT 1971 (design) • 1979 Nobel prize (jointly with Cormack) • Dr. James Ambrose – Neuroradiologist AMH (clinical) • Standing ovation at RSNA 1972 • Dr. BJ Perry – Head of Medical Physics SGH/AMH (radiation) • Dosimetry and image quality, measurements and methods Godfrey Hounsfield James Ambrose John Perry (GH died Aug 12th 2004, JA died March 12th 2006)

  8. CT scanner development 1971 • 2 x (8 – 10 mm), first dual slice scanner, • 80 x 80 matrix • 4 min per rotation

  9. Early Clinical Images - AMH Scanner • Data tapes sent away overnight for image reconstruction • Paper (CT numbers) or polaroid (Scan numbers 200 and 215, images A and B refer to the two slices imaged simultaneously)

  10. CT scanner development 1971 • Scanner is now in the science museum

  11. Godfrey Hounsfield – Nobel Speech 1979 Fig. 14 shows a picture from the experiment. The heart chambers can be discerned by a little intravenous injected contrast media. A further promising field may be the detection of the coronary arteries. …. It may be possible to detect these under special conditions of scanning.

  12. 2010 Scanning the heart has become a reality SOMATOM Definition Flash Temp res. 75 ms Coll. 128 x 0.6 mm Spatial res. 0.33 mm 350 ms for 149 mm Rotation 0.28 s 100 kV, 290 mAs/ rotation 0.90 mSv

  13. Development of the CT Scanner

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