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【A2 physics】CT scanning/ Computerised axial tomography


Lumina Wang

on 19 February 2013

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Transcript of 【A2 physics】CT scanning/ Computerised axial tomography

Lumina, Annabel, Frank, Jason Computerised Axial Tomography Purpose of CT scanning The End. Questions Principle of CT scanner Geoffrey Hounsfield CT imaging process What does the CT scanner use?
Let's watch a video first! Sir Godfrey Newbold Hounsfield, CBE, FRS, (28 August 1919 – 12 August 2004) was an English electrical engineer who shared the 1979 Nobel Prize for Physiology or Medicine with Allan McLeod Cormack for his part in developing the diagnostic technique of X-ray computed tomography (CT). What is X-ray computed tomography? CT scanner is a medical imaging procedure that utilizes computer-processed X-rays to produce tomographic images or 'slices' of specific areas of the body. ***3-Dimensional image. CT scanner is used to generate a three-dimensional image of the inside of an object from a large series of two-dimensional X-ray images taken around a single axis of rotation. *Step1:
The beam passes through the array from the side. *Step2:
The beam is rotated 45° so that it passes through the array diagonally. *Step3&4:
The beam is rotated twice more through 45° and each time the detected values are added to the memory grid. *Step5:
Now each voxel has been exposed to X-rays from four different directions. [w08]5.(a) Distinguish between the images produced by CT scanning and X-ray imaging.

(b) By reference to the principles of CT scanning, suggest why CT scanning could not be developed before powerful computers were available. (a) CT image: (thin) slice (through structure)
any further detail e.g. built up from many 'slice' / 3D image
X-ray image: 'shadow' image (of whole structure)/ 2D image (b) X-ray image of slice taken from many different angles
these images are combined (and processed)
repeated for many different slices
to built up a 3-D image
3-D image can be rotated
computer required to store and process huge quantity of data 4000-year-old mummy gets CT scan! Industrial CT Scanning is a process which utilizes x-ray equipment to produce 3D representations of components both externally and internally. Industrial CT scanning has been utilized in many areas of industry for internal inspection of components. Some of the key uses for CT scanning have been flaw detection, failure analysis, metrology, assembly analysis, and reverse engineering applications. Industrial use of CT
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