1. The impedance of the matching layer is:
a. less than the impedance of the skin
b. equal to the impedance of the skin
c. less than the impedance of the crystal
d. equal to the impedance of the crystal
2. Which of the following transducers displays a trapezoidal image?
a. convex array
b. vector array
c. annular array
d. curvilinear array
3. Which of the following differentiates similar or dissimilar tissues?
a. axial resolution
b. lateral resolution
c. contrast resolution
d. temporal resolution
4. Section thickness is related to the:
a. frame rate
b. beam width
c. penetration depth
d. operating frequency
5. Operating frequency of a transducer is directly related to the:
a. thickness of the element
b. diameter of the element
c. impedance of the element
d. propagation speed of the element
6. A focused 10-mm, 15-MHz transducer will demonstrate a focal diameter of:
a. 2.5 mm
b. 3.0 mm
c. 5.0 mm
d. 10.0 mm
7. The motion of moving structures in a 2-D image display describes:
a. motion mode
b. amplitude mode
c. real-time imaging
d. temporal resolution
8. In a brightness-mode display, the y-axis represents the:
a. penetration depth
b. compensation slope
c. amplitude of the reflector
d. right or left aspect of the body
9. The number of images per second defines the:
a. frame rate
b. line density
c. pulse repetition period
d. pulse repetition frequency
10. The frame rate in real-time imaging can be modified by adjusting the:
a. output power
b. dynamic range
c. amplification c. pulse repetition frequency
d. propagation speed of the medium
11. If the line density is increased, which of the following is most likely to occur?
a. frame rate will decrease
b. spatial resolution will decrease
c. temporal resolution will increase
d. pulse repetition frequency will decrease
12. Propagation speed of a medium limits which of the following?
a. penetration depth
b. pixel interpolation
c. harmonic frequencies
d. spatial compounding
13. A pulse repetition frequency of 10,000 Hz will demonstrate a maximum penetration depth of:
a. 7 to 8 cm
b. 8 to 10 cm
c. 10 to 11 cm
d. 12 to 14 cm
