Non-Destructive Testing (NDT) Practice Test

What does pulse echo systems in ultrasound refer to?

1. Using only transmitted sound energy

2. Systems using reflected and transmitted sound energy

3. Only using reflected sound energy

4. None of the above

The correct answer is: Systems using reflected and transmitted sound energy

Pulse echo systems in ultrasound are based on the principle of sending out short bursts (or pulses) of sound waves and then listening for the echoes that return after bouncing off structures within the body or material being tested. This method effectively utilizes both reflected and transmitted sound energy since the system is designed to send out pulses (transmission) and then detect the echoes that are created when those pulses hit interfaces or boundaries (reflection) within the material. When an ultrasound pulse is transmitted, it travels through different mediums and encounters interfaces, leading to reflection and partial transmission of the sound energy. The echoes that are received provide valuable information about the internal structure, allowing for the identification of any flaws, variations in material properties, or anatomical features. Thus, the correct answer encompasses the broader function of these systems, which is crucial in the practice of ultrasound. This combination of reflected and transmitted sound energy enables a comprehensive assessment, making option B the appropriate choice.