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CHAPTER 24: STRAIN AND STRAIN RATE IMAGING
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Select the one best answer for each of the following questions.
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1. The units of measurement for strain and strain rate are, respectively:
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2. At which point in the cardiac cycle is normal left ventricular strain at its peak value?
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3. At which point in the cardiac cycle does normal left ventricular strain rate have a value of zero?
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a. End-systole and during diastasis
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b. Isovolumic contraction and isovolumic relaxation
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c. Atrial contraction and isovolumic contraction
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d. Late systole and late diastole
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4. What does positive regional strain indicate about cardiac function?
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a. Enhanced myocardial contractility
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c. Reduced myocardial compliance
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d. Normal diastolic filling
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5. Which of the following is based on low-frequency, high-amplitude signals from wall motion and relies on insonation angle?
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b. Doppler myocardial deformation
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c. Doppler transmitral flow
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6. Which of the following best describes the integration of the velocity gradient between two points divided by the distance between them?
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7. Which of the following best describes signals that have a homogeneous spread throughout the myocardium, a relatively constant backscatter pattern throughout the cardiac cycle, and can be recognized by feature tracking algorithms?
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