ARDMS Ultrasound Physics & Instrumentation Practice Exam

Transducers are likely made of which material that produces ultrasound waves when stimulated?

1. Quartz

2. Lead zirconate titanate

3. Silicon

4. Gallium arsenide

The correct answer is: Lead zirconate titanate

Transducers are crucial components in ultrasound technology responsible for converting electrical energy into sound waves and vice versa. The correct material used in medical ultrasound transducers that produces ultrasound waves when stimulated is lead zirconate titanate, commonly referred to as PZT. PZT is a piezoelectric material, meaning it can generate an electrical charge in response to applied mechanical stress. Conversely, when an electric field is applied to this material, it will change shape, thereby generating sound waves. This property makes PZT highly suitable for use in ultrasound transducers, enhancing their efficiency and effectiveness in imaging and diagnostic applications. The other materials listed do not possess the same piezoelectric properties as PZT. Quartz is a piezoelectric material but is less effective in medical ultrasound applications compared to PZT. Silicon and gallium arsenide are also semiconductors and do not have the piezoelectric properties necessary to efficiently generate ultrasound waves. Therefore, the answer highlighting lead zirconate titanate reflects its key role in ultrasound transducer functionality.