Читать книгу Point-of-Care Ultrasound Techniques for the Small Animal Practitioner - Группа авторов - Страница 86

Gain is the overall brightness of the image. The ideal is not too bright and not too dark. The gain knob is the one that will adjust the overall gain setting. After first setting the overall gain, minimize dark or light bands across the screen by using the time gain compensation (TGC) knobs. These are usually sliders that adjust brightness along discrete bands across the image, although some machines have reduced the numbers of sliders to near‐ and far‐field. The goal is to have a consistent brightness from top to bottom of the screen, in other words, gain extending through the far‐field.