The dynamic range in signal processing is the range between the minimum low intensity and maximum high intensity signals that a system is capable of displaying.

See also QB-Mode.

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(CAI) Color amplitude imaging shows the amplitude of the Doppler signal from moving blood flow. CAI is an ultrasound technique with increased dynamic range and flow sensitivity. The sensitivity of Doppler ultrasound increases markedly in conjunction with the use of vascular contrast agents.

See also Amplitude Map, Amplitude Indicator.

Process of conversion of continuous (analog) signals, such as the detected ultrasound or MRI signal (voltage), into numbers. This is carried out with an analog to digital converter.
There are two kinds of discretization involved: the voltage is only measured (sampled) at particular discrete times and only voltages within a particular range and separated by a particular minimum amount can be distinguished. Voltages beyond this range are said to exceed the dynamic range of the digitizer.

QB-mode (Quadratic Brightness-mode) images are gray scale images from the quadratic component. QB-mode achieves higher contrast and increased dynamic range than the standard B-mode ultrasound images, without loss in spatial resolution.