Best Ultrasound MCQs Part 4.
Practice and improve your knowledge of best ultrasound mcqs fundamentals. This comprehensive set of 50+ multiple choice questions covers topics like propagation of ultrasound waves, attenuation, resolution, artifacts, bioeffects, Doppler ultrasound principles. Sharpen your skills and test your understanding of the essential concepts in diagnostic medical sonography.
Here Best Ultrasound MCQs Part 4.
1. In what zone does beam divergence occur?
A. At the face of the transducer
B. Focal zone
C. Fraunhofer zone
D. Fresnel zone
ANS:- C
2. The larger the aperture,
A. The shorter the near zone
B. The longer the near zone
C. The more divergence there is in far field
D. The shorter the Fresnel zone
ANS:- B
3. The ability to resolve two reflectors that lie parallel to the beam is the ___ resolution of a system
A. Axial
B. Lateral
C. Elevational
D. Temporal
ANS:- A
4. The more focal zones used,
A. The better the temporal resolution
B. The worse the temporal resolution
C. The better the axial resolution
D. The shorter the spatial pulse length
ANS:- B
5. In the most common type of transducers, the slice-thickness plane is focused:
A. Using a lens
B. Using a matrix array
C. Electronically
D. Using 2D technology
ANS:- A
6. If sound travels through a large quantity of water and then encounters a reflector, the reflector will appear to be:
A. Too far away
B. Too close
C. In the correct location
D. Not enough information to tell
ANS:- A
7. What is the maximum temperature increase below which there should be no thermally induced biologic effects?
A. 95°C
B. 10°c
C. 4°C
D. 2°c
ANS:- D
8. Two sound beams with different frequencies are traveling through soft tissue. Which beam will travel faster?
A. The higher-frequency sound
B. The lower-frequency sound
C. Both will travel at the same speed
D. Cannot be determined
ANS:- C
9. A video display that is limited to only black and white, with no other shades of gray, is called:
A. Binary
B. Monochrome
C. Bistable
D. Unichrome
ANS:- C
10. What is the name for the smallest amount of digital storage?
A. The bit
B. The pixel
C. The byte
D. The megabyte
ANS:- A
11. In the Fresnel zone,
A. The beam diameter is a constant
B. The beam diameter diverges
C. The beam area increases with distance from the transducer
D. The beam area decreases with distance from the transducer
ANS:- D
12. Information that travels to the scan converter from the receiver is initially in what format?
A. Analog
B. Digital
C. Binary
D. Hexadecimal
ANS:- A
13. Which of the following is true about color Doppler?
A. Each pixel can be both color and grayscale at the same time
B. Each pixel can either be grayscale or color
C. Pixels cannot be colorized
D. The gain determines the color priority of the pixels
ANS:- B
14. Which of the following preserves the pixel density when enlarging the image?
A. Read zoom
B. Write magnification
C. Max zoom
D. Postprocessing magnification
ANS:- B
15. What is the relationship between amplitude and frequency?
A. Directly related
B. Inversely related
C. No relation
D. Sometimes they are related, sometimes not
ANS:- C
16. What is the relationship between spatial pulse length and pulse duration?
A. Directly related
B. Inversely related
C. No relation
D. Sometimes they are related, sometimes not
ANS:- A
17. Which of the following is true about axial resolution?
A. It decreases with depth
B. It increases with depth
C. It does not vary with depth
D. It is best at the focal zone
ANS:- C
18. If the ______ is increased, the flow increases.
A. Pressure differential
B. Resistance
C. Length of vessel
D. Viscosity of blood
ANS:- A
19. Which law describes the relationship between flow and the pressure differential, viscosity, and length?
A. Bernoulli’s law
B. Poiseuille’s law
C. Snell’s law
D. Doppler’s law
ANS:- B
20. The most common type of flow found in the body is:
A. Plug
B. Turbulent
C. Laminar
D. Chaotic
ANS:-C
21. The echo intensity on a grayscale of 32 shades is represented by the binary number:
A. 10101
B. 1010
C. 100000
D. 110000
ANS:-C
22. Preprocessing of the information that is fed to the scan converter:
A. Enlarges each pixel to provide a magnified image
B. Determines the cathode ray tube brightness assigned to stored grayscale levels
C. Determines the assignment of echoes to predetermined gray levels
D. Determines the grayscale emphasis of stored gray levels
ANS:-C
23. Which of the following do grayscale systems typically use as a means of signal dynamic range reduction?
A. Rejection
B. Compression
C. Relaxation
D. Edge enhancement
ANS:-B
24. Area is expressed by which of the following units?
A. mis
B. cm
C. cm2
D. cm3
ANS:-C
25. If the frequency of a transducer is increased, which of the following will decrease?
A. Wavelength
B. Propagation speed
C. Pulse repetition frequency
D. Pulse repetition period
ANS:-A
26. With tissue harmonic imaging,
A. The propagating pressure wave causes the image to be distorted
B. There is worse lateral resolution
C. There are increased artifacts in the near field
D. There are decreased artifacts in the near field
ANS:- D
27. Which of the following is in the range of infrasound?
A. 1.5 kHz
B. 15 Hz
C. 25 Hz
D. 1 MHz
ANS:- B
28. Which of the following is in the range of audible sound?
A. 15 Hz
B. 18 kHz
C. 25,000 Hz
D. 2 Hz
ANS:- B
29. Which of the following can be changed by the operator?
A. Frequency
B. Wavelength
C. Propagation speed
D. Pulse repetition frequency
ANS:- D
30. Which of the following is the time it takes for one cycle to occur?
A. Period
B. Frequency
C. Wavelength
D. Pulse repetition period
ANS:- A
31. The length of the pulse is the:
A. Period
B. Wavelength
C. Pulse repetition frequency
D. Spatial pulse length
ANS:- D
32. Assuming oblique angle of incidence, if the propagation speed of medium 1 is greater than the propagation speed of medium 2, what will the angle of transmission be?
A. Greater than the angle of incidence
B. Less than the angle of incidence
C. Equal to the angle of incidence
D. Propagation speed does not influence the angle of transmission
ANS:- B
33. A 5-MHz wave travels through 5 cm of soft tissue. If a 3.5-MHz transducer is selected instead, what happens to the propagation speed of the medium?
A. Increases
B. Decreases
C. No change
D. Not enough information given
ANS:- C
34. The slowest propagation speed is found in which medium?
A. Bone
B. Air
C. Muscle
D. Liver
ANS:- B
35. Which of the following represents the strength of the beam?
A. Frequency
B. Intensity
C. 0-factor
D. Duty factor
ANS:- B
36. Which of the following is the unit of pressure amplitude?
A. W/cm2
B.mm
C. mW
D. Pascal
ANS:- D
37. Which of the following is the unit of intensity?
A. W/cm2
B.mW
C. Pascal
D. dB/cm
ANS:- A
38. What else changes with a change in amplitude?
A. Resonating frequency
B. Output power
C. Wavelength
D. Spatial pulse length
ANS:- B
39. Which of the following will increase the acoustic exposure to the patient?
A. Increased receiver amplification
B. Increased time-gain compensation
C. Decreased pulse repetition frequency
D. Increased output gain
ANS:- D
40. Which operator control adjusts the intensity of the transmitted pulse?
A. Receiver gain
B. Depth of scanning
C. Power
D. Time-gain compensation
ANS:- C
41. What happens to the power if the intensity is doubled?
A. No change
B. It doubles
C. It quadruples
D. It is halved
ANS:- B
42. The number of pulses that occur in 1 s is the:
A. Pulse repetition frequency
B. Pulse repetition period
C. Pulse duration
D. Duty factor
ANS:- A
43. What is along the x-axis on a spectral Doppler waveform?
A. Depth
B. Amplitude
C. Time
D. Velocity
ANS:- C
44. What is a unit of spatial pulse length?
A. μs
B.m
C. mis
D. m/s2
ANS:- B
45. What testing device is used to measure acoustic output (intensity) level?
A. Tissue phantom
B. AIUM test phantom
C. Doppler flow phantom
D. Hydrophone
ANS:- D
46. What is the principle that states sound waves are the result of the interference of many wavelets produced at the face of the transducer?
A. Doppler’s principle
B. Bernoulli’s principle
C. Huygen’s principle
D. Poiseuille’s principle
ANS:- C
47. When using tissue harmonic imaging, the frequency used is
A. Four times the fundamental frequency
B. Double the fundamental frequency
C. Equal to the fundamental frequency
D. One half the fundamental frequency
ANS:- B
48. In B-mode imaging, amplitude is located on the_ -axis of the image
A. X
B. y
C. Z
D.c
ANS:- C
49. Which of the following determines the radial resolution of a system?
A. Pulse repetition frequency
B. Impedance
C. Spatial pulse length
D. Duty factor
ANS:- C
50. The axial resolution can be improved by decreasing the ______ or increasing the _____ _
A. Impedance, pulse duration
B. Number of cycles in a pulse, wavelength
C. Propagation speed, spatial pulse length
D. Number of cycles in a pulse, frequency
ANS:- D
51. Two reflectors are 1.3 mm apart in a plane that is parallel to the beam. The spatial pulse length of the transducer is 2.6 mm. These two reflectors:
A. Will show up as one dot on the screen
B. Will show up as two dots on the screen
C. Will not show up on the image at all
D. Will have poor lateral resolution
ANS:- B
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