Home
Radiology Guides Anatomy Physio & Path Medicine Physics Contact
FILTER MATERIAL

Physics

FILTER MATERIAL

1. We want the filter material to cause predominantly photoelectric absorption.
2. This is the only type of attenuation that is energy-dependent (remember Z 3 /E 3 ).
3. Z must not be too high as we don’t want to soften (i.e. filter & scatter) the beam too much.

MATERIALS
4. Aluminium (Z = 13), usually 1.5 mm.
5. Copper (Z = 29), usually 0.1 - 0.3 mm. Produces 9 keV characteristic radiation which must be absorbed by an Al backing filter.


Avatar
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

+ Home