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X-RAY TUBE-ANGLED FOCAL SPOT

Physics

X-RAY TUBE-ANGLED FOCAL SPOT

ANGLED, ROTATING FOCAL SPOT
1. Anode heating is spread over a larger area for the same effective focal spot size.
2. Having a smaller focal spot reduces penumbra (edge blurring).

ANODE HEEL EFFECT
3. Disadvantage of angling the anode, leads to a reduction in beam intensity towards the side of the anode.
4. Caused by absorption of the emitted X-rays by the anode itself. Occurs when the X-rays emerge at a near-grazing angle.
5. Can be reduced by increasing the source-image distance (SID).



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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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