Ultrasound Physics I - Chapter 8

Front

What is the Q-factor in ultrasound physics?

Back

The Q-factor, or quality factor, is a dimensionless parameter that describes the bandwidth of a transducer. A low Q-factor indicates a wide bandwidth, which is desirable for imaging applications.

Front

What does PZT stand for in ultrasound technology?

Back

PZT stands for Lead Zirconate Titanate, a material commonly used in piezoelectric transducers.

Front

What is the function of the case in an ultrasound transducer?

Back

The case houses the internal components of the transducer, providing protection and structural integrity.

Front

Can a transducer with a crack in the casing be used?

Back

No, a transducer with a crack in the casing cannot be used as it may lead to malfunction or safety hazards.

Front

Do each of the crystals in a transducer have their own wire?

Back

Yes, each crystal in a transducer is connected to its own wire to allow for individual signal processing.

Front

What is the significance of bandwidth in ultrasound?

Back

Bandwidth refers to the range of frequencies a transducer can emit. A wider bandwidth allows for better resolution and imaging quality.

Front

What is the piezoelectric effect?

Back

The piezoelectric effect is the ability of certain materials to generate an electric charge in response to applied mechanical stress.

Front

How does frequency affect ultrasound imaging?

Back

Higher frequencies provide better resolution but less penetration, while lower frequencies penetrate deeper but offer lower resolution.

Front

What role does the acoustic insulator play in a transducer?

Back

The acoustic insulator minimizes the loss of sound energy and prevents interference from external vibrations.

Front

What is the purpose of the external backing in a transducer?

Back

The external backing dampens the vibrations of the piezoelectric crystals, improving image quality by reducing ringing.