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SIGNAL-TO-NOISE RATIO (SNR)

Physics

SIGNAL-TO-NOISE RATIO (SNR)

1. The signal-to-noise ratio (SNR) is an object size-dependent measure of the signal level in the presence of noise.

2. (where x i is the signal at each pixel i in the ROI, x BG is the mean bakground signal, is the standard deviation of photons - i.e. noise in the background).

3. Signal-to-noise ratio increases as the number of photons contributing to the image increases.

4. Inceasing noise reduces contrast resolution.


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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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