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FUS 3.3 Adjusting and optimizing gain

Ultrasound Gain


  • Ultrasound gain is the adjustment of the brightness or contrast of the image produced by an ultrasound machine. 
  • Ultrasound gain plays a crucial role in controlling the overall image quality. By adjusting the gain, an operator can enhance the visibility of certain structures or minimize background noise. 
  • Increasing the gain amplifies the received signals, resulting in a brighter image, but also more possible artifact.
  • Decreasing the gain reduces the signals and produces a darker image, but you may lose information on the anatomy being scanned. 
  • It is important to find the right balance of gain settings to ensure the optimal visualization of the structures being examined, without introducing excessive noise or losing essential information in the process. Proper gain adjustment can significantly impact the diagnostic accuracy of ultrasound imaging.
  • Setting gain in the face using parotid:
    • always start with the parotid gland to get a reference image that is familiar and adjust the gain to this reference. The parotid should look isoechoic, masseter should look hypoechoic
      • suggests gain of approx 60


  • Start near ear, identify parotid gland
  • Marker towards nose
  • Note triangular shaped parotid that is isoechoic
  • Note septated hypoechonic massater muscle
  • Note mandibular bone


  • [Picture with too much, too little, correct gain]
  • [picture of surface anatomy while determining gain]
  • Once your gain is set, you usually do not need to regularly alter it again for your exam.
  • Set gain by swiping your finger left on the screen to decrease, and swiping rate in order to increase.