3

Chapter 3


Questions



  1. 41. As transducer frequency increases, backscatter strength:

    1. A. Decreases
    2. B. Increases
    3. C. Does not change
    4. D. Refracts

  2. 42. If an echo arrives 39 µs after a pulse has been emitted, at what depth should the reflecting object be on the scan line?

    1. A. 3 cm
    2. B. 6 cm
    3. C. 1 cm
    4. D. None of the above

  3. 43. The Doppler shift produced by an object moving at a speed of 1 m/s toward the transducer emitting ultrasound at 2 MHz would be:

    1. A. 2.6 kHz
    2. B. 1.3 kHz
    3. C. 1 MHz
    4. D. 200 Hz

  4. 44. In the above example, the reflected ultrasound will have a frequency of:

    1. A. 2 002 600 Hz
    2. B. 1 998 700 Hz
    3. C. 1 000 000 Hz
    4. D. 2 MHz

  5. 45. Reflected ultrasound from an object moving away from the sound source will have a frequency:

    1. A. Higher than original sound
    2. B. Lower than the original sound
    3. C. Same as the original sound
    4. D. Variable, depending on source of sound and velocity of the moving object

  6. 46. Reflected ultrasound from an object moving perpendicular to the sound source will have a frequency:

    1. A. Higher than original sound
    2. B. Lower than the original sound
    3. C. Same as the original sound
    4. D. Variable, depending on source of sound and velocity of the moving object

  7. 47. Doppler shift frequency is independent of:

    1. A. Operating frequency
    2. B. Doppler angle
    3. C. Propagation speed
    4. D. Amplitude

  8. 48. On a continuous wave Doppler display, amplitude is represented by:

    1. A. Brightness of the signal
    2. B. Vertical extent of the signal
    3. C. Width of the signal
    4. D. None of the above

  9. 49. Doppler signals from the myocardium, compared with those from the blood pool, display:

    1. A. Lower velocity
    2. B. Greater amplitude
    3. C. Both of the above
    4. D. None of the above

  10. 50. Doing which of the following modifications to the Doppler processing will allow myocardial velocities to be recorded selectively compared with blood pool velocities?

    1. A. A band pass filter that allows low velocities
    2. B. A band pass filter that allows high amplitude signals
    3. C. Both
    4. D. Neither

  11. 51. If the propagation speed is 1.6 mm/µs and the pulse round trip time is 5 µs, the distance to the reflector is:

    1. A. 8 mm
    2. B. 4 mm
    3. C. 10 mm
    4. D. Cannot be determined

  12. 52. How long after a pulse is sent out by a transducer does an echo from an object at a depth of 5 cm return?

    1. A. 13 µs
    2. B. 65 µs
    3. C. 5 µs
    4. D. Cannot be determined

  13. 53. For soft tissues, the attenuation coefficient at 3 MHz is:

    1. A. 1 dB/cm
    2. B. 6 dB/cm
    3. C. 1.5 dB/cm
    4. D. 3 dB/cm

  14. 54. If the density of a medium is 1000 kg/m3

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Jun 12, 2016 | Posted by in CARDIOLOGY | Comments Off on 3

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