Auto Gain Control or Auto TGC: Letting the machine set gain levels automatically.
©Walter Rasmussen, R.D.C.S.
Auto Gain or Auto TGC is a quick, one-step adjustment to ultrasound image brightness and contrast. This adjustment is a good way to get close to the best quality image for the conditions and selected frequency.
Auto-Gain button on Philips Ultrasound machines.
The effectiveness of this type of adjustment is still dependent upon the sonographer’s selection of other parameters such as focus and frequency and usually needs further fine-tuning relevant to the areas of interest. This adjustment is labeled, iScan or AutoSCAN on Philips ultrasound machines, TEQ on Siemens ultrasound machines and AUTO or CTO (continuous tissue optimization) on GE machines.
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