ARDMS SPI - ARDMS Sonography Principles and Instrumentation Transducer Construction and Function Questions and Answers

Question 1

Which component of an ultrasound transducer is specifically designed with an acoustic impedance intermediate between the piezoelectric crystal and the patient's skin to improve sound transmission?

Accepted Answer

The matching layer

Answer

The damping material

Answer

The acoustic lens

Answer

The piezoelectric element

Question 2

A sonographer is using a transducer with a heavy backing material. Which of the following is a primary consequence of this design feature?

Accepted Answer

Improved axial resolution

Answer

Increased spatial pulse length

Answer

Narrower bandwidth

Answer

Increased sensitivity

Question 3

The operating frequency of a single-crystal ultrasound transducer is most directly determined by which of the following physical characteristics?

Accepted Answer

The thickness of the piezoelectric crystal

Answer

The diameter of the crystal

Answer

The thickness of the matching layer

Answer

The strength of the electrical voltage

Question 4

A phased array transducer achieves electronic steering and focusing of the ultrasound beam by:

Accepted Answer

Introducing precise time delays to the excitation of individual elements.

Answer

Mechanically moving the crystal elements.

Answer

Changing the thickness of the piezoelectric elements.

Answer

Applying a curved acoustic lens to the transducer face.

Question 5

Which of the following describes the piezoelectric effect as it is utilized in an ultrasound transducer during sound wave reception?

Accepted Answer

Conversion of a pressure wave into an electrical signal.

Answer

Conversion of electrical energy into heat.

Answer

Conversion of an electrical signal into a mechanical vibration.

Answer

Conversion of acoustic energy into light.

Question 6

A transducer with a low Q-factor is characterized by:

Accepted Answer

A wide bandwidth and a short spatial pulse length.

Answer

A narrow bandwidth and a long spatial pulse length.

Answer

A wide bandwidth and a long spatial pulse length.

Answer

A narrow bandwidth and a short spatial pulse length.