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CONTRAST-kV RELATIONSHIP

Physics

CONTRAST-kV RELATIONSHIP

INCREASING kV
1. Increasing kV leads to more photons, hence improving SNR. But leads to reduction in contrast due to less attenuation differences.

DECREASING kV
2. As kV is decreased, the scatter produced is less in the forwards direction so less reaches the detector.
3. In addition, the scatter produced is less penetrating.
4. Decreasing kV increases the contrast but mainly because of increased photoelectric absorption.


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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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