Chapter 5: Quantitative Echocardiography

CHAPTER 5: QUANTITATIVE ECHOCARDIOGRAPHY

Select the one best answer for each question.

1. Frequency is defined as:

a. Number of wavelengths passing through a certain point

b. Number of pulses passing through a certain point

c. Number of positive deflections of a wave passing through a certain point

d. Number of negative deflections of a wave passing through a certain point

e. Number of pulses divided by the number of wavelengths

a.

2. The units of frequency are:

a. Meters/second

b. Pulses/second

c. Centimeters

d. Seconds

e. Hertz

e.

3. Frequency determines:

a. Resolution

b. Brightness

c. Contrast

d. Compensation

a.

4. The Doppler principle is based on the:

a. Change in speed of the returning sound waves

b. Change in speed of emitted sound waves

c. Change in frequency of the returning sound waves

d. Change in angle of the returning sound waves

e. Change in resolution

c.

5. The Doppler shift is most accurately calculated when the angle between the emitted and reflected sounds is:

a. 90 degrees

b. 30 degrees

c. 0 degrees

d. 45 degrees

e. 120 degrees

c.

6. The underestimation of Doppler shift is significantly increased when the angle of reflection increases more than:

a. 15 degrees

b. 30 degrees

c. 10 degrees

d. 20 degrees

e. 25 degrees

d.

7. Misalignment of the Doppler beam with the blood flow:

a. Can cause underestimation of the gradient