Question 1

If the aperture increases,the near-zone length ________.

Accepted Answer

A)  doubles 
B)  increases 
C)  decreases 
D)  remains unchanged 
A)  doubles 
B)  increases 
C)  decreases 
D)  remains unchanged

Question 2

The operating frequency depends on the element propagation speed and thickness

Accepted Answer

A) True 
 B)False

Question 3

Many frequencies are present in short pulses.

Accepted Answer

A) True 
 B)False

Question 4

Without compensation,the ultrasound transducer would cause about _________ of the emitted intensity to be reflected at the skin boundary.

Accepted Answer

A)  25% 
B)  80% 
C)  10% 
D)  50% 
A)  25% 
B)  80% 
C)  10% 
D)  50%

Question 5

The useful frequency range for most diagnostic applications is ____________ MHz.

Accepted Answer

A)  1-15 
B)  2-20 
C)  2-15 
D)  1-50 
A)  1-15 
B)  2-20 
C)  2-15 
D)  1-50

Question 6

The focal length is the distance between equal beam widths that are some multiple of the minimum value at the focus.

Accepted Answer

A) True 
 B)False

Question 7

Lateral resolution remains consistent at any depth.

Accepted Answer

A) True 
 B)False

Question 8

The three aspects of imaging resolution include axial,contrast,and temporal resolution.

Accepted Answer

A) True 
 B)False

Question 9

Axial resolution is often normally better than lateral resolution.

Accepted Answer

A) True 
 B)False

Question 10

Phasing can ________.

Accepted Answer

A)  focus the beam 
B)  improve the image quality 
C)  steer the beam 
D)  All of the above. 
A)  focus the beam 
B)  improve the image quality 
C)  steer the beam 
D)  All of the above.

Question 11

Minimum reflector separation in the direction perpendicular to the beam direction describes axial resolution.

Accepted Answer

A) True 
 B)False

Question 12

At a distance of two near-zone lengths,the beam diameter is _______ the diameter of the transducer element.

Accepted Answer

A)  one half of 
B)  double 
C)  equal to 
D)  triple 
A)  one half of 
B)  double 
C)  equal to 
D)  triple

Question 13

Axial resolution is determined by the width of the ultrasound beam.

Accepted Answer

A) True 
 B)False

Question 14

Lateral resolution is equal to _____________.

Accepted Answer

A)  wavelength/2 
B)  beam width 
C)  spatial pulse length/2 
D)  operating frequency/2 
A)  wavelength/2 
B)  beam width 
C)  spatial pulse length/2 
D)  operating frequency/2

Question 15

The frequency of a transducer is determined by the diameter and the propagation speed of the element.

Accepted Answer

A) True 
 B)False

Question 16

Invasive transducers ________.

Accepted Answer

A)  decrease detail resolution 
B)  utilize smaller wavelengths 
C)  increase imaging depth 
D)  utilize lower frequencies 
A)  decrease detail resolution 
B)  utilize smaller wavelengths 
C)  increase imaging depth 
D)  utilize lower frequencies

Question 17

Elevational resolution can be considered a third aspect of detail resolution.

Accepted Answer

A) True 
 B)False

Question 18

The matching layer __________________.

Accepted Answer

A)  reduces reflection of ultrasound at element 
B)  reduces transmission of ultrasound at element 
C)  increases reflection of the ultrasound element 
D)  increases the spatial pulse length 
A)  reduces reflection of ultrasound at element 
B)  reduces transmission of ultrasound at element 
C)  increases reflection of the ultrasound element 
D)  increases the spatial pulse length

Question 19

Which resolution relates more directly to transducers?

Accepted Answer

A)  Temporal. 
B)  Contrast. 
C)  Vectoral. 
D)  Detail. 
A)  Temporal. 
B)  Contrast. 
C)  Vectoral. 
D)  Detail.

Question 20

Factors determining axial resolution are the ________________.

Accepted Answer

A)  frequency and wavelength 
B)  beam diameter and element thickness 
C)  number of cycles in the pulse and wavelength 
D)  propagation speed and number of cycles in a pulse 
A)  frequency and wavelength 
B)  beam diameter and element thickness 
C)  number of cycles in the pulse and wavelength 
D)  propagation speed and number of cycles in a pulse

If the aperture increases,the near-zone length ________.

The operating frequency depends on the element propagation speed and thickness

Many frequencies are present in short pulses.

Without compensation,the ultrasound transducer would cause about _________ of the emitted intensity to be reflected at the skin boundary.

The useful frequency range for most diagnostic applications is ____________ MHz.

The focal length is the distance between equal beam widths that are some multiple of the minimum value at the focus.

Lateral resolution remains consistent at any depth.

The three aspects of imaging resolution include axial,contrast,and temporal resolution.

Axial resolution is often normally better than lateral resolution.

Phasing can ________.

Minimum reflector separation in the direction perpendicular to the beam direction describes axial resolution.

At a distance of two near-zone lengths,the beam diameter is _______ the diameter of the transducer element.

Axial resolution is determined by the width of the ultrasound beam.

Lateral resolution is equal to _____________.

The frequency of a transducer is determined by the diameter and the propagation speed of the element.

Invasive transducers ________.

Elevational resolution can be considered a third aspect of detail resolution.

The matching layer __________________.

Which resolution relates more directly to transducers?

Factors determining axial resolution are the ________________.

Introduction

Ultrasound

Instruments

Doppler Principles

Artifacts

Performance and Safety

Filters

Exam 3: Transducers

If the aperture increases,the near-zone length ________.

The operating frequency depends on the element propagation speed and thickness

Many frequencies are present in short pulses.

Without compensation,the ultrasound transducer would cause about _________ of the emitted intensity to be reflected at the skin boundary.

The useful frequency range for most diagnostic applications is ____________ MHz.

The focal length is the distance between equal beam widths that are some multiple of the minimum value at the focus.

Lateral resolution remains consistent at any depth.

The three aspects of imaging resolution include axial,contrast,and temporal resolution.

Axial resolution is often normally better than lateral resolution.

Phasing can ________.

Minimum reflector separation in the direction perpendicular to the beam direction describes axial resolution.

At a distance of two near-zone lengths,the beam diameter is _______ the diameter of the transducer element.

Axial resolution is determined by the width of the ultrasound beam.

Lateral resolution is equal to _____________.

The frequency of a transducer is determined by the diameter and the propagation speed of the element.

Invasive transducers ________.

Elevational resolution can be considered a third aspect of detail resolution.

The matching layer __________________.

Which resolution relates more directly to transducers?

Factors determining axial resolution are the ________________.

Introduction

Ultrasound

Instruments

Doppler Principles

Artifacts

Performance and Safety

Filters