ARDMS SPI Exam Review TEST 4

August 16, 2017 By Rana Waqar Leave a Comment

1. The change in the direction of the original sound wave that occurs when sound interacts with two different tissue types that have a different propagation speed is referred to as:
- a. Wavelength
- b. Scattering
- c. Refraction
- d. Absorption
2. Which of the following is an appropriate unit of measurement for propagation speed?
- a. millimeters per microsecond (mm/s)
- b. watts per centimeter squared (W/cm2)
- c. microseconds (s)
- d. kilohertz (kHz)
3. The major component of attenuation is:
- a. Scatter
- b. Absorption
- c. Transmission
- d. Refraction
4. In clinical imaging, the wavelength measures between:
- a. 1 and 10 Hz
- b. 1540 and 2000 m/s
- c. 0 and 1
- d. 0.1 to 0.8 mm
5. The duty factor for continuous wave ultrasound is:
- a. 99%
- b. 100%
- c. 20,000 Hz
- d. 8 Pa
6. All of the following relate to the strength of the sound wave except:
- a. Amplitude
- b. Wavelength
- c. Intensity
- d. Power
7. What is the change in intensity if the power decreases by half?
- a. Intensity doubles
- b. Intensity is halved
- c. Intensity is one fourth
- d. Intensity does not change
8. Damping of the sound beam:
- a. Reduces the spatial pulse length
- b. Increases the spatial pulse length
- c. Increases the pulse duration
- d. Has no impact on spatial pulse length or pulse duration
9. What is defined as the ability of the ultrasound system to image structures that are positioned parallel to the sound beam as separate structures?
- a. Transverse resolution
- b. Parallel resolution
- c. Axial resolution
- d. Coronal resolution
10. What is defined as the beginning of one pulse to the beginning of the next pulse, and therefore includes both the “on” and “off” time?
- a. Pulse repetition period
- b. Pulse duration
- c. Duty factor
- d. Pulse repetition frequency

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