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CT RECONSTRUCTION-CT NUMBER

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CT RECONSTRUCTION-CT NUMBER

1. Most commonly a 512x512 matrix (although 1024x1024 is sometimes used).

2. Composed of voxels (volume elements) rather than pixels.

3. Each voxel has three dimensions with a depth equal to slice thickness.

4. Each displayed pixel stores a value known as the CT number (CTn, AKA Hounsfield unit) - the average linear attenuation coefficient of the tissues within the voxel.

5. (where μ T = average linear attenuation coefficient of the tissues, μ W = linear attenuation coefficient of water).


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REFERENCES

1. Bushberg, J. T. (2012). The essential physics of medical imaging. Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. Find it at Amazon
2. Heggie, J. C., Liddell, N. A., & Maher, K. P. (1997). Applied imaging technology. Melbourne: St. Vincents Hospital.

Ⓒ A. Manickam 2018

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