Question 1

The dimension perpendicular to the scan plane is called ________.

Accepted Answer

A)   side lobes
B)   section thickness
C)   grating lobes
D)   variable apertureE) A) and D)
F) B) and D) B

Question 2

The matching layer increases reflection of the transducer element.

Accepted Answer

A) True 
 B)False

Question 3

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.E) A) and B)
F) All of the above

Question 4

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 mmE) A) and B)
F) A) and C)

Question 5

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 tissueE) A) and B)
F) A) and C)

Question 6

Damping material in pulsed transducers increases the spatial pulse length.

Accepted Answer

A) True 
 B)False  False

Question 7

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.E) B) and C)
F) A) and C)

Question 8

Electric _______ applied to a transducer are converted to ultrasound.

Accepted Answer

A)   pulses
B)   waves
C)   echoes
D)   voltagesE) A) and C)
F) B) and D)

Question 9

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)   7.5E) All of the above
F) A) and C)

Question 10

The transducer has an impedance ______ times that of tissue.

Accepted Answer

A)   4
B)   10
C)   20
D)   6E) A) and D)
F) A) and C)

Question 11

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

Accepted Answer

A)   focused; steered
B)   steered; focused
C)   variable; focused
D)   generated; receivedE) B) and C)
F) C) and D)

Question 12

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

Accepted Answer

A)   Curie point
B)   quality factor
C)   critical point
D)   piezoelectric pointE) A) and D)
F) B) and C)

Question 13

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.E) A) and D)
F) B) and D)

Question 14

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.E) None of the above
F) A) and B)

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

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.E) B) and C)
F) None of the above

Question 17

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

Accepted Answer

A)   short focus
B)   narrow focus
C)   long focus
D)   wide focusE) B) and C)
F) None of the above

Question 18

Electronic scanning is performed by ________ transducers.

Accepted Answer

A)   linear
B)   array
C)   sector
D)   mechanicalE) A) and B)
F) A) and C)

Question 19

Ultrasound transducers operate according to _____________.

Accepted Answer

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

Question 20

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.E) All of the above
F) B) and D) C

Exam 3: Transducers

The dimension perpendicular to the scan plane is called ________.

Correct AnswerverifiedB

The matching layer increases reflection of the transducer element.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The purpose of the coupling medium is ________.

Correct AnswerverifiedShow Answer

Damping material in pulsed transducers increases the spatial pulse length.

Correct AnswerverifiedFalse

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

Correct AnswerverifiedShow Answer

Electric _______ applied to a transducer are converted to ultrasound.

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

The transducer has an impedance ______ times that of tissue.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Electronic scanning is performed by ________ transducers.

Correct AnswerverifiedShow Answer

Ultrasound transducers operate according to _____________.

Correct AnswerverifiedShow Answer

Which of the following describes the far zone?

Correct AnswerverifiedC

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B

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False

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With phasing,the reception beam is and dynamically .

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C