The echoes are stored before final display by the:

• A. receiver
• B. computer memory
• C. demodulator
• D. transducer

Answer: (B)

The correct answer highlights the role of computer memory in the process of echo storage prior to final display in various systems, particularly in imaging techniques like ultrasound. The computer memory temporarily holds the digital data that is generated from the reflections or echoes received from the transducer.

When an ultrasound transducer emits sound waves into the body, these waves bounce off various structures and return as echoes. This process generates raw data, which the system needs to process for imaging purposes. The receiver amplifies and prepares the echo signals, but it is the computer memory that is essential for storing these digital representations of the echoes. This stored data allows for subsequent processing, manipulation, and ultimately visualization on the display screen.

This step is crucial because it enables complete signal processing to be carried out, including filtering, image reconstruction, and adjustments necessary for obtaining the best final image quality. It also allows for the possibility of saving the data for future reference or analysis. Thus, computer memory plays a pivotal role in managing and optimizing the echo signals before they are presented to the user or operator.