Difference between revisions of "CT x-ray scanner"

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Here are some sample images that illustrate the process. The algorithm is quite simple.
 
Here are some sample images that illustrate the process. The algorithm is quite simple.
  
In a real CAT Scan system the 1 dimensional slices would be taken from the horizontal row of a series of x-rays. In this demo I don't yet have the x-rays to work with so I synthesize the 1D bands from the target image that I want to regenerate. So given a target image I generate a series of 1D radial slices by rotating the target image and then averaging all values in the rows of the image. Then I rotate the slice back to the original angle.
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In a real [http://en.wikipedia.org/wiki/Computed_tomography CAT Scan] system the 1 dimensional slices would be taken from the horizontal row of a series of x-rays. In this demo I don't yet have the x-rays to work with so I synthesize the 1D bands from the target image that I want to regenerate. So given a target image I generate a series of 1D radial slices by rotating the target image and then averaging all values in the rows of the image. Then I rotate the slice back to the original angle.
  
 
Slices are synthesized from a 180 degree rotation of the target image.
 
Slices are synthesized from a 180 degree rotation of the target image.

Revision as of 08:51, 13 December 2007

CAT Scanning

Here are some sample images that illustrate the process. The algorithm is quite simple.

In a real CAT Scan system the 1 dimensional slices would be taken from the horizontal row of a series of x-rays. In this demo I don't yet have the x-rays to work with so I synthesize the 1D bands from the target image that I want to regenerate. So given a target image I generate a series of 1D radial slices by rotating the target image and then averaging all values in the rows of the image. Then I rotate the slice back to the original angle.

Slices are synthesized from a 180 degree rotation of the target image.

Relative position of each scan slice
The target and four 1 dimensional sections. The position of the sections corresponds to the angle of projection. Cell 3 Cell 4
Cell B Cell C