Ultrasound Multiple Choice Questions
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Question 1 of 55
1. Question
Concerning the propagation of ultrasound
(a) The speed of ultrasound propagation depends on ultrasound frequency
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Question 2 of 55
2. Question
Concerning the propagation of ultrasound
(b) Ultrasound travels fastest in a vacuum
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Question 3 of 55
3. Question
Concerning the propagation of ultrasound
(c) Most ultrasound scanners assume a speed of ultrasound of 1540 cm/s
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Question 4 of 55
4. Question
Concerning the propagation of ultrasound
(d) Ultrasound changes speed as it passes through different tissue structures
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Question 5 of 55
5. Question
Concerning the propagation of ultrasound
(e) Tissue experiences compression and rarefaction as an ultrasound wave passes
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Question 6 of 55
6. Question
Concerning ultrasound artefacts
(a) Distances measured in bone are longer than they appear in an ultrasound image
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Question 7 of 55
7. Question
Concerning ultrasound artefacts
(b) For a mirror image artefact, the object nearest to the probe is artefactual
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Question 8 of 55
8. Question
Concerning ultrasound artefacts
(c) Acoustic shadowing can occur due to reflection of ultrasound at boundaries
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Question 9 of 55
9. Question
Concerning ultrasound artefacts
(d) Refraction of ultrasound at a boundary varies with angle
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Question 10 of 55
10. Question
Concerning ultrasound artefacts
(e) The proportion of ultrasound reflected at a boundary between two materials varies with angle
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Question 11 of 55
11. Question
Concerning ultrasound imaging
(a) In conventional B-mode imaging, axial resolution increases with pulse duration
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Question 12 of 55
12. Question
Concerning ultrasound imaging
(b) Penetration depth increases with ultrasound frequency
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Question 13 of 55
13. Question
Concerning ultrasound imaging
(c) Spatial compounding reduces the appearance of refraction artefacts
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Question 14 of 55
14. Question
Concerning ultrasound imaging
(d) Harmonic imaging improves lateral resolution
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Question 15 of 55
15. Question
Concerning ultrasound imaging
(e) The time-gain control (TGC) is used to focus the beam
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Question 16 of 55
16. Question
Concerning Doppler ultrasound
(a) The maximum blood flow velocity that can be measured using pulse-wave Doppler is limited by sample depth
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Question 17 of 55
17. Question
Concerning Doppler ultrasound
(b) Choice of colour scale in Colour Doppler affects the Pulse Repetition Frequency
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Question 18 of 55
18. Question
Concerning Doppler ultrasound
(c) A Doppler angle of 60 degrees gives the most accurate velocity measurements
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Question 19 of 55
19. Question
Concerning Doppler ultrasound
(d) Aliasing can be avoided by reducing the pulse repetition frequency
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Question 20 of 55
20. Question
Concerning Doppler ultrasound
(e) The Doppler shift from blood flow is in the audible frequency range
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Question 21 of 55
21. Question
Concerning ultrasound safety and quality assurance
(a) Ultrasound has no known bioeffects
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Question 22 of 55
22. Question
Concerning ultrasound safety and quality assurance
(b) Care should be taken to minimise peak rarefaction pressure in the presence of ultrasound contrast agents
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Question 23 of 55
23. Question
Concerning ultrasound safety and quality assurance
(c) Localised heating of tissue is less likely when using B-mode imaging compared to Doppler techniques
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Question 24 of 55
24. Question
Concerning ultrasound safety and quality assurance
(d) Ultrasound users are responsible for monitoring on-screen safety indices
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Question 25 of 55
25. Question
Concerning ultrasound safety and quality assurance
(e) Contrast resolution is measured using an ultrasound test object in units of decibel (dB)
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Question 26 of 55
26. Question
On ultrasound interactions:
(a) Scattering is dependent on the size of the scatterers and the transmitted ultrasound frequency
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Question 27 of 55
27. Question
On ultrasound interactions:
(b) Attenuation is solely cause by absorption of sound
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Question 28 of 55
28. Question
On ultrasound interactions:
(c ) The speed of sound is uniform in soft tissue
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Question 29 of 55
29. Question
On ultrasound interactions:
(d) The appearance of specular reflection is dependent on the angle of insonation to the reflector
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Question 30 of 55
30. Question
On ultrasound interactions:
(e) Refraction occurs where there the ultrasound beam is perpendicular to the interface and there is a difference in acoustic impedance between tissue types.
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Question 31 of 55
31. Question
On transducers and beamforming
(a) Ultrasound beams are steered by timing differences in the transmit pulse across the array
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Question 32 of 55
32. Question
On transducers and beamforming
(b) Lateral resolution varies with depth and toward the edge of the image
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Question 33 of 55
33. Question
On transducers and beamforming
(c )The slice thickness of a conventional linear or curvilinear array varies with depth
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Question 34 of 55
34. Question
On transducers and beamforming
(d) Higher frequency linear arrays will always produce higher contrast images than a lower frequency probe.
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Question 35 of 55
35. Question
On transducers and beamforming
(e) Reducing image width can increase image frame rate and allow improved lateral line density,
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Question 36 of 55
36. Question
On ultrasound controls
(a) Harmonic imaging uses non-linear ultrasound propagation in tissue to reduce artefacts in the ultrasound image
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Question 37 of 55
37. Question
On ultrasound controls
(b) Higher ultrasound transmit frequencies will lead to decreased scattering and improved contrast resolution.
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Question 38 of 55
38. Question
On ultrasound controls
(c ) The dynamic range control restricts the bandwidth of the transmitted ultrasound pulse
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Question 39 of 55
39. Question
On ultrasound controls
(d) Spatial compounding uses beams transmitted at different angles to reduce the effects of speckle in the final image
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Question 40 of 55
40. Question
On ultrasound controls
pounding can lead to reduced shadowing artefacts that may be useful in specific clinical applications
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Question 41 of 55
41. Question
Regarding artefacts
(a) Mirror images can appear deep to images of superficial bone
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Question 42 of 55
42. Question
Regarding artefacts
(b) Enhancement occurs deep to high attenuation structures in the field of view
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Question 43 of 55
43. Question
Regarding artefacts
(c )Reverberation is always caused by a strong reflection from tissue which is re-reflected at the transducer face
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Question 44 of 55
44. Question
Regarding artefacts
(d) The appearance of speckle is dependent on the transmitted frequency.
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Question 45 of 55
45. Question
Regarding artefacts
(e) Acoustic shadowing in an image can be reduced by using spatial compounding.
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Question 46 of 55
46. Question
Regarding Doppler ultrasound
(a) Aliasing in pulsed wave Doppler occurs when the pulse repetition frequency is too low to sample the Doppler frequency adequately.
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Question 47 of 55
47. Question
Regarding Doppler ultrasound
(b) Aliasing can be reduced by reducing the angle between the flow direction and the transmitted beam.
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Question 48 of 55
48. Question
Regarding Doppler ultrasound
(c )Measurement of velocities require a correction of the beam/flow angle to be made by the operator.
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Question 49 of 55
49. Question
Regarding Doppler ultrasound
(d) Colour flow imaging typically uses different pulses to B-mode and reduces effective frame rate of the image.
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Question 50 of 55
50. Question
Regarding Doppler ultrasound
(e) Gain, pulsed repetition frequency, transmit frequency, colour box size and transmit focus all affect the appearance of the colour flow image.
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Question 51 of 55
51. Question
Regarding safety
(a) TIC is used to assess heating risk in second and third trimester scanning.
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Question 52 of 55
52. Question
Regarding safety
(b) MI can be useful in controlling the behaviour of contrast agent bubbles in diagnostic ultrasound
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Question 53 of 55
53. Question
Regarding safety
(c )The recommended outputs for ophthalmic ultrasound imaging are lower than for general ultrasound imaging.
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Question 54 of 55
54. Question
Regarding safety
(d) TI is an indication of the probability of risk from cavitation effects in diagnostic ultrasound
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Question 55 of 55
55. Question
Regarding safety
(e) Changes to transmit frequency, depth of field of view, focus, colour flow imaging and pulsed wave spectral Doppler can all affect heating of tissue in diagnostic ultrasound
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