Which component is responsible for regulating the amplitude of the received signal in an ultrasound system?

The receiver in an ultrasound system is responsible for regulating the amplitude of the received signal. Once the ultrasound waves reflect off the tissues and return to the transducer, the receiver amplifies these signals to enhance their strength for further processing. This allows for a clearer visualization of the structures being imaged since varying tissue characteristics and depths can lead to significant differences in signal strength. By adjusting the amplitude, the receiver ensures that the signals are at an appropriate level for optimal processing and display, which is crucial for accurate image interpretation.

While the transmitter generates the ultrasound waves and the processor interprets the data to create images, they do not directly control the amplitude of the signals received. The output display simply presents the processed images to the user, but it does not involve regulating signal amplitude. This clear division of functions underscores why the receiver is the correct choice for this question.