Doppler Ultrasound Principles - Part 1

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| By Kfdm26
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Kfdm26
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Doppler Ultrasound Principles - Part 1 - Quiz

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Questions and Answers
  • 1. 

    The source & receiver approaching one another is a

    • A.

      Negative shift

    • B.

      Positive shift

    • C.

      No change

    Correct Answer
    B. Positive shift
    Explanation
    When the source and receiver are approaching each other, there is a compression of the waves in front of the source, resulting in a decrease in wavelength and an increase in frequency. This causes a shift towards higher frequencies, known as a positive shift.

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  • 2. 

    Source & receiver moving away from one another is a

    • A.

      Negative shift

    • B.

      No change

    • C.

      Positive shift

    Correct Answer
    A. Negative shift
    Explanation
    When the source and receiver are moving away from each other, it causes an increase in the wavelength of the waves. This is known as a redshift and is associated with a decrease in frequency and energy. In terms of the Doppler effect, it is a negative shift because the observed frequency is lower than the emitted frequency. This negative shift indicates that the waves are stretched out and have a longer wavelength compared to when the source and receiver are at rest relative to each other.

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  • 3. 

    Change in frequency occurs because of movement of RBC's

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The given statement is true because the movement of red blood cells (RBCs) can cause a change in frequency. When RBCs move, they create disturbances in the surrounding fluid, which can be detected as changes in frequency. This phenomenon is utilized in various medical devices, such as Doppler ultrasound, where the movement of RBCs is measured by the change in frequency of reflected sound waves. Therefore, the statement is correct.

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  • 4. 

    If increased frequency, the Doppler shift will

    • A.

      Increased

    • B.

      Decreased

    • C.

      Remain unchanged

    Correct Answer
    A. Increased
    Explanation
    When the frequency of a wave increases, the Doppler shift also increases. The Doppler shift refers to the change in frequency or wavelength of a wave as observed by an observer moving relative to the source of the wave. If the frequency of the wave increases, it means that the source is moving towards the observer, causing a higher frequency to be observed. Therefore, the correct answer is "increased".

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  • 5. 

    Velocity of the reflector is directly proportional to

    • A.

      Doppler shift

    • B.

      Frequency

    • C.

      Reflector

    Correct Answer
    A. Doppler shift
    Explanation
    The velocity of the reflector is directly proportional to the Doppler shift. This means that as the velocity of the reflector increases, the Doppler shift also increases. The Doppler shift is a change in frequency that occurs when there is relative motion between the source of a wave and the observer. In the case of a reflector, the velocity of the reflector affects the change in frequency observed by the reflector. Therefore, the velocity of the reflector and the Doppler shift are directly related.

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  • 6. 

    Doppler Shift Frequency is proportional to Velocity of Flow

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The statement is true because the Doppler shift frequency is directly proportional to the velocity of flow. The Doppler effect occurs when there is relative motion between the source of waves (in this case, the flow) and the observer. When the source is moving towards the observer, the frequency of the waves appears higher, and when the source is moving away, the frequency appears lower. Therefore, as the velocity of flow increases, the Doppler shift frequency also increases.

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 16, 2012
    Quiz Created by
    Kfdm26
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