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ANTI-SCATTER GRID/FILTER

Physics

ANTI-SCATTER GRID/FILTER

1. Consists of thin strips of lead sandwiched between thicker strips of low attenuation interspace material.
2. Scattered photons that hit the grid obliquely are absorbed by the lead.
3. A high proportion of the primary photons pass through the gaps and reach the detector.
4. Improves contrast.
5. Increases patient dose (as some primary photons are absorbed by the interspace material & AEC increases mAs to compensate).
6. Not generally required if a long object-image distance is used (the “air gap technique”).
7. Can be focused or unfocused.


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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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