Question 1

Which of the following describes the far zone?

Accepted Answer

A)  It lies within one near zone length. 
B)  It is called the Fresnel zone. 
C)  Its beam width (diameter) increases with increasing depth. 
D)  The length of the far zone increases with increases in frequency. 
A)  It lies within one near zone length. 
B)  It is called the Fresnel zone. 
C)  Its beam width (diameter) increases with increasing depth. 
D)  The length of the far zone increases with increases in frequency. C

Question 2

Damping material in pulsed transducers increases the spatial pulse length.

Accepted Answer

A) True 
 B)False  False

Question 3

The dimension perpendicular to the scan plane is called ________.

Accepted Answer

A)  side lobes 
B)  section thickness 
C)  grating lobes 
D)  variable aperture 
A)  side lobes 
B)  section thickness 
C)  grating lobes 
D)  variable aperture B

Question 4

Continuous-wave (CW) transducers have higher efficiencies because energy is not lost to damping material.

Accepted Answer

A) True 
 B)False

Question 5

Electronic scanning is performed by ________ transducers.

Accepted Answer

A)  linear 
B)  array 
C)  sector 
D)  mechanical 
A)  linear 
B)  array 
C)  sector 
D)  mechanical

Question 6

What principle states that some materials produce a voltage when deformed by an applied pressure?

Accepted Answer

A)  ALARA (as low as reasonably achievable) principle. 
B)  Piezoelectric principle. 
C)  Snell's principle. 
D)  Huygens' principle. 
A)  ALARA (as low as reasonably achievable) principle. 
B)  Piezoelectric principle. 
C)  Snell's principle. 
D)  Huygens' principle.

Question 7

Ultrasound transducers operate according to _____________.

Accepted Answer

A)  Snell's law 
B)  Huygen's principle 
C)  the piezoelectric principle 
D)  the piezoenergy principle 
A)  Snell's law 
B)  Huygen's principle 
C)  the piezoelectric principle 
D)  the piezoenergy principle

Question 8

The matching layer increases reflection of the transducer element.

Accepted Answer

A) True 
 B)False

Question 9

The transducer has an impedance ______ times that of tissue.

Accepted Answer

A)  4 
B)  10 
C)  20 
D)  6 
A)  4 
B)  10 
C)  20 
D)  6

Question 10

Which image format is similar to that for convex array except that the footprint is smaller?

Accepted Answer

A)  Sector. 
B)  Vector. 
C)  Curvilinear. 
D)  Interventional. 
A)  Sector. 
B)  Vector. 
C)  Curvilinear. 
D)  Interventional.

Question 11

The near-zone length is determined by the size and the _________ of the element.

Accepted Answer

A)  thickness 
B)  propagation speed 
C)  operating frequency 
D)  All of the above. 
A)  thickness 
B)  propagation speed 
C)  operating frequency 
D)  All of the above.

Question 12

Electric _______ applied to a transducer are converted to ultrasound.

Accepted Answer

A)  pulses 
B)  waves 
C)  echoes 
D)  voltages 
A)  pulses 
B)  waves 
C)  echoes 
D)  voltages

Question 13

Which of the following determines the beam width at the focus?

Accepted Answer

A)  Focal length and frequency. 
B)  Aperture, focal length, and wavelength. 
C)  Aperture propagation speed and thickness. 
D)  Spatial pulse length and propagation speed of the element. 
A)  Focal length and frequency. 
B)  Aperture, focal length, and wavelength. 
C)  Aperture propagation speed and thickness. 
D)  Spatial pulse length and propagation speed of the element.

Question 14

If the propagation speed of the transducer element is 4 mm/µs,the thickness required for an operating frequency of 10 MHz is ________.

Accepted Answer

A)  0.4 mm 
B)  0.8 mm 
C)  0.2 mm 
D)  0.1 mm 
A)  0.4 mm 
B)  0.8 mm 
C)  0.2 mm 
D)  0.1 mm

Question 15

The purpose of the coupling medium is ________.

Accepted Answer

A)  to provide patient comfort 
B)  to produce an air pocket 
C)  to reduce the number of cycles in a pulse 
D)  to facilitate passage of ultrasound into human tissue 
A)  to provide patient comfort 
B)  to produce an air pocket 
C)  to reduce the number of cycles in a pulse 
D)  to facilitate passage of ultrasound into human tissue

Question 16

The critical temperature an ultrasound transducer cannot exceed is called the ________.

Accepted Answer

A)  Curie point 
B)  quality factor 
C)  critical point 
D)  piezoelectric point 
A)  Curie point 
B)  quality factor 
C)  critical point 
D)  piezoelectric point

Question 17

If the propagation speed of the transducer element material is 6 mm/µs,the operating frequency for a thickness of 0.2 mm is ______ MHz.

Accepted Answer

A)  15 
B)  30 
C)  12 
D)  7.5 
A)  15 
B)  30 
C)  12 
D)  7.5

Question 18

Which of the following frequencies is operated by the thinnest element?

Accepted Answer

A)  2.5 MHz. 
B)  3.5 MHz. 
C)  7.5 MHz. 
D)  10.0 MHz. 
A)  2.5 MHz. 
B)  3.5 MHz. 
C)  7.5 MHz. 
D)  10.0 MHz.

Question 19

With phasing,the reception beam is ________ and dynamically ________.

Accepted Answer

A)  focused; steered 
B)  steered; focused 
C)  variable; focused 
D)  generated; received 
A)  focused; steered 
B)  steered; focused 
C)  variable; focused 
D)  generated; received

Question 20

Utilization of multiple focal points is likely to achieve a ________.

Accepted Answer

A)  short focus 
B)  narrow focus 
C)  long focus 
D)  wide focus 
A)  short focus 
B)  narrow focus 
C)  long focus 
D)  wide focus

Which of the following describes the far zone?

Damping material in pulsed transducers increases the spatial pulse length.

The dimension perpendicular to the scan plane is called ________.

Continuous-wave (CW) transducers have higher efficiencies because energy is not lost to damping material.

Electronic scanning is performed by ________ transducers.

What principle states that some materials produce a voltage when deformed by an applied pressure?

Ultrasound transducers operate according to _____________.

The matching layer increases reflection of the transducer element.

The transducer has an impedance ______ times that of tissue.

Which image format is similar to that for convex array except that the footprint is smaller?

The near-zone length is determined by the size and the _________ of the element.

Electric _______ applied to a transducer are converted to ultrasound.

Which of the following determines the beam width at the focus?

If the propagation speed of the transducer element is 4 mm/µs,the thickness required for an operating frequency of 10 MHz is ________.

The purpose of the coupling medium is ________.

The critical temperature an ultrasound transducer cannot exceed is called the ________.

If the propagation speed of the transducer element material is 6 mm/µs,the operating frequency for a thickness of 0.2 mm is ______ MHz.

Which of the following frequencies is operated by the thinnest element?

With phasing,the reception beam is and dynamically .

Utilization of multiple focal points is likely to achieve a ________.

Introduction

Ultrasound

Instruments

Doppler Principles

Artifacts

Performance and Safety

Filters

Exam 3: Transducers

Which of the following describes the far zone?

Damping material in pulsed transducers increases the spatial pulse length.

The dimension perpendicular to the scan plane is called ________.

Continuous-wave (CW) transducers have higher efficiencies because energy is not lost to damping material.

Electronic scanning is performed by ________ transducers.

What principle states that some materials produce a voltage when deformed by an applied pressure?

Ultrasound transducers operate according to _____________.

The matching layer increases reflection of the transducer element.

The transducer has an impedance ______ times that of tissue.

Which image format is similar to that for convex array except that the footprint is smaller?

The near-zone length is determined by the size and the _________ of the element.

Electric _______ applied to a transducer are converted to ultrasound.

Which of the following determines the beam width at the focus?

If the propagation speed of the transducer element is 4 mm/µs,the thickness required for an operating frequency of 10 MHz is ________.

The purpose of the coupling medium is ________.

The critical temperature an ultrasound transducer cannot exceed is called the ________.

If the propagation speed of the transducer element material is 6 mm/µs,the operating frequency for a thickness of 0.2 mm is ______ MHz.

Which of the following frequencies is operated by the thinnest element?

With phasing,the reception beam is ________ and dynamically ________.

Utilization of multiple focal points is likely to achieve a ________.

Introduction

Ultrasound

Instruments

Doppler Principles

Artifacts

Performance and Safety

Filters

With phasing,the reception beam is and dynamically .