1

Chapter 1


Questions



  1. 1. The speed of sound in tissues is:

    1. A. Roughly 1540 m/s
    2. B. Roughly 1540 km/s
    3. C. Roughly 1540 cm/s
    4. D. Roughly 1540 m/min

  2. 2. The relationship between propagation speed, frequency, and wavelength is given by the formula:

    1. A. Propagation speed = frequency × wavelength
    2. B. Propagation speed = wavelength/frequency
    3. C. Propagation speed = frequency/wavelength
    4. D. Propagation speed = wavelength × period

  3. 3. The frame rate increases with:

    1. A. Increasing the depth
    2. B. Reducing sector angle
    3. C. Increasing line density
    4. D. Adding color Doppler to B-mode imaging

  4. 4. Period is a measure of:

    1. A. Duration of one wavelength
    2. B. Duration of half a wavelength
    3. C. Amplitude of the wave

  5. 5. Determination of regurgitant orifice area by the proximal isovelocity surface area (PISA) method is based on:

    1. A. Law of conservation of mass
    2. B. Law of conservation of energy
    3. C. Law of conservation of momentum
    4. D. Jet momentum analysis

  6. 6. In which situation can you not use the simplified Bernoulli equation to derive the pressure gradient?

    1. A. Peak instantaneous gradient across a nonobstructed mitral valve
    2. B. Peak gradient across a severely stenotic aortic valve
    3. C. Mean gradient across a severely stenotic aortic valve
    4. D. Mean gradient across a stenotic tricuspid valve

  7. 7. Which of the following resolutions change with increasing field depth?

    1. A. Axial resolution
    2. B. Lateral resolution

  8. 8. With a fixed-focus transducer with crystal diameter 20 mm and wavelength 2.5 mm, what is the depth of the focus?

    1. A. 40 m
    2. B. 30 mm
    3. C. 40 mm
    4. D. 4 m

  9. 9. A sonographer adjusts the ultrasound machine to double the depth of view from 5 to 10 cm. If sector angle is reduced to keep the frame rate constant, which of the following has changed?

    1. A. Axial resolution
    2. B. Temporal resolution
    3. C. Lateral resolution
    4. D. The wavelength

  10. 10. Which of the following properties of a reflected wave is most important in the genesis of a two-dimensional image?

    1. A. Amplitude
    2. B. Period
    3. C. Pulse repetition period
    4. D. Pulse duration

  11. 11. Increasing depth will change all of the following except:

    1. A. Pulse duration
    2. B. Pulse repetition period
    3. C. Pulse repetition frequency
    4. D. Duty factor

  12. 12. The two-dimensional images are produced because of this phenomenon when the ultrasound reaches the tissue:

    1. A. Refraction
    2. B. Backscatter
    3. C. Specular reflection
    4. D. Transmission

  13. 13. Attenuation of ultrasound as it travels through tissue is higher at:

    1. A. Greater depth
    2. B. Lower transducer frequency
    3. C. Blood rather than soft tissue like muscle
    4. D. Bone more than air

  14. 14. The half-intensity depth is a measure of:

    1. A. Ultrasound attenuation in tissue
    2. B. Half the wall thickness in mm
    3. C. Coating on the surface of the transducer
    4. D. Half the ultrasound beam width

  15. 15. What is the highest pulse repetition frequency (PRF) of a 3 MHz pulsed wave transducer imaging at a depth of 7 cm?

    1. A. 21 000 Hz
    2. B. 2 333 Hz
    3. C. 11 000 Hz
    4. D. 2.1 million Hz

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Jun 12, 2016 | Posted by in CARDIOLOGY | Comments Off on 1

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