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ULTRASOUND-TIME GAIN COMPENSATION

Physics

ULTRASOUND-TIME GAIN COMPENSATION

1. The amplitude of the sound pulse decreases the further it travels into the body due to attenuation by tissue.

2. Similarly, the echo is attenuated as it travels back towards the transducer.

3. This means that a reflector deep in the body produces a weaker echo than one closer to the surface.

4. We compensate for this attenuation electronically with time gain compensation: as soon as the transducer is pulsed, the gain (amount of amplification) is steadily increased in proportion to the time elapsed and, thus, the distance travelled by the sound.

5. Can be varied by the operator.


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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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