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CHAPTER 5: QUANTITATIVE ECHOCARDIOGRAPHY
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Select the one best answer for each question.
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1. Frequency is defined as:
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a. Number of wavelengths passing through a certain point
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b. Number of pulses passing through a certain point
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c. Number of positive deflections of a wave passing through a certain point
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d. Number of negative deflections of a wave passing through a certain point
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e. Number of pulses divided by the number of wavelengths
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2. The units of frequency are:
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4. The Doppler principle is based on the:
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a. Change in speed of the returning sound waves
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b. Change in speed of emitted sound waves
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c. Change in frequency of the returning sound waves
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d. Change in angle of the returning sound waves
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5. The Doppler shift is most accurately calculated when the angle between the emitted and reflected sounds is:
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6. The underestimation of Doppler shift is significantly increased when the angle of reflection increases more than:
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7. Misalignment of the Doppler beam with the blood flow:
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a. Can cause underestimation of the gradient
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