Image formation and
radiographic quality
1. The process whereby a radiographic image is created by variations in absorption and transmission of the exiting x-ray beam is known as ______.
a) Attenuation
b) The photoelectric effect
c) The Compton effect
d) Differential absorption
Ans: D
2.
Which of the following processes occur during the x-ray beam interaction with
tissue?
(1)
absorption
(2)
photon transmission
(3) scattering
a) 1 and 2 only
b) 1 and 3 only
c) 2 and 3 only
d) 1, 2, and 3
Ans: D
3. The ability of an x-ray photon to remove an atom’s electron is a characteristic known as ______.
a) Attenuation
b) Scattering
c) Ionization
d) Absorption
Ans: C
4. The x-ray interaction responsible for absorption is ______.
a) Differential
b) Photoelectric
c) Attenuation
d) Compton
Ans: B
5. The x-ray interaction responsible for scattering is ______.
a) Differential
b) Photoelectric
c) Attenuation
d) Compton
Ans: D
6.
Remnant radiation is composed of which of the following?
(1)
transmitted radiation
(2)
absorbed radiation
(3) scattered radiation
a) 1 and 2 only
b) 1 and 3 only
c) 2 and 3 only
d) 1, 2, and 3
Ans: B
7. What interaction causes unwanted exposure to the image, known as fog?
a) Compton
b) Transmitted
c) Photoelectric
d) Absorption
Ans: A
8.
Which of the following factors would affect beam attenuation?
(1)
tissue atomic number
(2)
beam quality
(3) fog
a) 1 and 2 only
b) 1 and 3 only
c) 2 and 3 only
d) 1, 2, and 3
Ans: A
9. The high-brightness areas on a radiographic image are created by ________.
a) Transmitted radiation
b) Scattered radiation
c) Absorbed radiation
d) Primary radiation
Ans: C
10. An anatomic part that transmits the incoming x-ray photon would create an area of ______________ on the radiographic image.
a) Fog
b) High brightness
c) Low brightness
d) Noise
Ans: C
11. The process of creating a radiographic image by differential absorption varies for film-screen and digital imaging.
a) True
b) False
Ans: B
12. Which attribute(s) of a radiographic image affect(s) the visibility of sharpness?
a) Distortion
b) Contrast
c) Brightness
d) B and c
Ans: D
13. A radiographic image with many shades of gray but few differences among them is said to have ________.
a) High contrast
b) Low contrast
c) Short-scale contrast
d) Excessive noise
Ans: B
14. Which of the following is defined as the range of exposure intensities that an image receptor can accurately detect?
a) Long-scale contrast
b) Spatial resolution
c) Quantum noise
d) Dynamic range
Ans: D