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CT RECONSTRUCTION-FILTERED BACK PROJECTION

Physics

CT RECONSTRUCTION-FILTERED BACK PROJECTION

1. The most common method used for image reconstruction.
2. For each pencil beam measurement, the values that are projected back use the data not just from the pencil beam itself but also from the neighbouring pencil beams.
3. Similar to back projection but each projection is first multiplied by a filter or kernel.
4. Different kernels exist (e.g. to enhance edges or to detect low contrast detail).

ADVANTAGE
5. Large reduction in blurring (increased contrast resolution).

DISADVANTAGE
6. Noise is amplified.
7. Sharp edges in the scanned structure (e.g. a fluid surface) can cause line artefacts.


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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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