Question 1

Edge shadowing is caused by

Accepted Answer

A)  refraction 
B)  reverberation 
C)  propagation speed error 
D)  a highly attenuating structure 
A)  refraction 
B)  reverberation 
C)  propagation speed error 
D)  a highly attenuating structure A

Question 2

Aliasing does not occur in ________.

Accepted Answer

A)  color Doppler 
B)  duplex imaging 
C)  spectral Doppler 
D)  continuous-wave Doppler 
A)  color Doppler 
B)  duplex imaging 
C)  spectral Doppler 
D)  continuous-wave Doppler D

Question 3

Increased intensity of echoes in the focal region of the beam is called _______.

Accepted Answer

A)  harmonics 
B)  shadowing 
C)  focal banding 
D)  enhancement 
A)  harmonics 
B)  shadowing 
C)  focal banding 
D)  enhancement C

Question 4

Which of the following is not a form of reverberation artifact?

Accepted Answer

A)  Comet tail. 
B)  Ring down. 
C)  Mirror image. 
D)  Speckle. 
A)  Comet tail. 
B)  Ring down. 
C)  Mirror image. 
D)  Speckle.

Question 5

Which type of artifact is most likely to produce a doubling of a single image?

Accepted Answer

A)  Reflection. 
B)  Refraction. 
C)  Reverberation. 
D)  Section thickness. 
A)  Reflection. 
B)  Refraction. 
C)  Reverberation. 
D)  Section thickness.

Question 6

Which of the following is a common and convenient solution to eliminate aliasing?

Accepted Answer

A)  Increasing transducer frequency. 
B)  Decreasing pulse repetition frequency. 
C)  Decreasing transducer frequenty. 
D)  Shifting the baseline. 
A)  Increasing transducer frequency. 
B)  Decreasing pulse repetition frequency. 
C)  Decreasing transducer frequenty. 
D)  Shifting the baseline.

Question 7

Propagation speed error displaces structures ________.

Accepted Answer

A)  axially 
B)  medially 
C)  laterally 
D)  anteriorly 
A)  axially 
B)  medially 
C)  laterally 
D)  anteriorly

Question 8

Lateral duplication of a single structure into two separate structures describes mirror imaging artifact.

Accepted Answer

A) True 
 B)False

Question 9

Color Doppler mirror image artifact is commonly displayed when imaging which of the following vessels?

Accepted Answer

A)  Abdominal aorta. 
B)  Subclavian artery. 
C)  Internal jugular vein. 
D)  Common carotid artery. 
A)  Abdominal aorta. 
B)  Subclavian artery. 
C)  Internal jugular vein. 
D)  Common carotid artery.

Question 10

Increasing the Doppler angle may eliminate aliasing.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following would likely demonstrate acoustic enhancement?

Accepted Answer

A)  Liver. 
B)  Pancreas. 
C)  Gallbladder. 
D)  Falciform ligament. 
A)  Liver. 
B)  Pancreas. 
C)  Gallbladder. 
D)  Falciform ligament.

Question 12

The comet-tail artifact is a case of ________.

Accepted Answer

A)  refraction 
B)  resolution 
C)  attenuation 
D)  reverberation 
A)  refraction 
B)  resolution 
C)  attenuation 
D)  reverberation

Question 13

How is detail resolution artifactual?

Accepted Answer

A)  There is a failure to resolve two reflectors. 
B)  Actual size of structure is decreased. 
C)  Two adjacent structures are resolved. 
D)  Multiple reflections are displayed beneath the real reflector. 
A)  There is a failure to resolve two reflectors. 
B)  Actual size of structure is decreased. 
C)  Two adjacent structures are resolved. 
D)  Multiple reflections are displayed beneath the real reflector.

Question 14

Axial resolution is determined by ________ and lateral resolution is determined by ________.

Accepted Answer

A)  pulse width; pulse length 
B)  pulse length; pulse width 
C)  pulse width; operating frequency 
D)  operating frequency; pulse length 
A)  pulse width; pulse length 
B)  pulse length; pulse width 
C)  pulse width; operating frequency 
D)  operating frequency; pulse length

Question 15

Which of the following is a result of sound refraction?

Accepted Answer

A)  Axial duplication of structures. 
B)  Displacement of structures axially. 
C)  Displacement of structures laterally. 
D)  Multiple equally spaced linear reflections. 
A)  Axial duplication of structures. 
B)  Displacement of structures axially. 
C)  Displacement of structures laterally. 
D)  Multiple equally spaced linear reflections.

Question 16

If the propagation speed through a medium is faster than 1.54 mm/µs,the reflector will be placed ________.

Accepted Answer

A)  medial to the correct position 
B)  lateral to the correct position 
C)  deeper than the correct position 
D)  shallower than the correct position 
A)  medial to the correct position 
B)  lateral to the correct position 
C)  deeper than the correct position 
D)  shallower than the correct position

Question 17

Mirror imaging of a Doppler spectrum is most likely a result of the ________.

Accepted Answer

A)  wall filter being set too low 
B)  Doppler gain being set too high 
C)  pulse repetition frequency being set too low 
D)  pulse repetition frequency being set too high 
A)  wall filter being set too low 
B)  Doppler gain being set too high 
C)  pulse repetition frequency being set too low 
D)  pulse repetition frequency being set too high

Question 18

Section thickness artifact is also called ________.

Accepted Answer

A)  partial-volume artifact 
B)  ring-down artifact 
C)  comet-tail artifact 
D)  resonance phenomenon 
A)  partial-volume artifact 
B)  ring-down artifact 
C)  comet-tail artifact 
D)  resonance phenomenon

Question 19

Mirror image is commonly seen around which structure?

Accepted Answer

A)  Kidney. 
B)  Stomach. 
C)  Pancreas. 
D)  Diaphragm. 
A)  Kidney. 
B)  Stomach. 
C)  Pancreas. 
D)  Diaphragm.

Question 20

Which of the following results from the underlying distribution of scatterers?

Accepted Answer

A)  Speckle. 
B)  Ring-down. 
C)  Comet tail. 
D)  Section thickness. 
A)  Speckle. 
B)  Ring-down. 
C)  Comet tail. 
D)  Section thickness.

Edge shadowing is caused by

Aliasing does not occur in ________.

Increased intensity of echoes in the focal region of the beam is called _______.

Which of the following is not a form of reverberation artifact?

Which type of artifact is most likely to produce a doubling of a single image?

Which of the following is a common and convenient solution to eliminate aliasing?

Propagation speed error displaces structures ________.

Lateral duplication of a single structure into two separate structures describes mirror imaging artifact.

Color Doppler mirror image artifact is commonly displayed when imaging which of the following vessels?

Increasing the Doppler angle may eliminate aliasing.

Which of the following would likely demonstrate acoustic enhancement?

The comet-tail artifact is a case of ________.

How is detail resolution artifactual?

Axial resolution is determined by and lateral resolution is determined by .

Which of the following is a result of sound refraction?

If the propagation speed through a medium is faster than 1.54 mm/µs,the reflector will be placed ________.

Mirror imaging of a Doppler spectrum is most likely a result of the ________.

Section thickness artifact is also called ________.

Mirror image is commonly seen around which structure?

Which of the following results from the underlying distribution of scatterers?

Introduction

Ultrasound

Transducers

Instruments

Doppler Principles

Performance and Safety

Filters

Exam 6: Artifacts

Edge shadowing is caused by

Aliasing does not occur in ________.

Increased intensity of echoes in the focal region of the beam is called _______.

Which of the following is not a form of reverberation artifact?

Which type of artifact is most likely to produce a doubling of a single image?

Which of the following is a common and convenient solution to eliminate aliasing?

Propagation speed error displaces structures ________.

Lateral duplication of a single structure into two separate structures describes mirror imaging artifact.

Color Doppler mirror image artifact is commonly displayed when imaging which of the following vessels?

Increasing the Doppler angle may eliminate aliasing.

Which of the following would likely demonstrate acoustic enhancement?

The comet-tail artifact is a case of ________.

How is detail resolution artifactual?

Axial resolution is determined by ________ and lateral resolution is determined by ________.

Which of the following is a result of sound refraction?

If the propagation speed through a medium is faster than 1.54 mm/µs,the reflector will be placed ________.

Mirror imaging of a Doppler spectrum is most likely a result of the ________.

Section thickness artifact is also called ________.

Mirror image is commonly seen around which structure?

Which of the following results from the underlying distribution of scatterers?

Introduction

Ultrasound

Transducers

Instruments

Doppler Principles

Performance and Safety

Filters

Axial resolution is determined by and lateral resolution is determined by .