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FILTERS

Physics

FILTERS

1. Low energy photons are largely absorbed by the patient and contribute to dose without contributing to the image.
2. The purpose of filtration is to reduce the dose to the patient without compromising the image.
3. Total filtration = inherent filtration + added filtration. Should be at least 2.5 mm Al equivalent, therefore we add about 1.5 mm Al.

INHERENT FILTRATION
4. From: Anode, tube housing, insulating oil and the glass insert. Typically equivalent to ~ 1 mm Al (aluminium).

ADDED FILTRATION
5. Uniform flat sheet(s) of metal, usually aluminium or copper.


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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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