Chapter 30 Image Perception Bushong: Radiologic Science for Technologists
MULTIPLE CHOICE
1. Image perception is a scientific term for what we call visual . a.
search
b. acuity
c. sensitivity
d. training
ANS: C
Image perception is a scientific term for what we call visual sensitivity.
2. What is the basic illumination level unit?
a. Lumen per square meter
b. Candela
c. Lux
d. Lumen per square meter and lux
ANS: D
Illumination levels are measured in units of lumen per square meter or lux.
3. The decreasing luminous intensity with increasing distance from the source of light
follows
.
a. the law of gravity
b. Murphy’s law
, c. cosine law
d. the inverse square law
ANS: D
The decreasing luminous intensity with increasing distance from the source of light
follows the inverse square law.
4. The ambient light levels in the reading area should be . a. daylight bright
b. slightly dimmed
c. near darkness
d. complete darkness
ANS: C
The ambient light levels in the reading area should be near darkness.
5. The special demands of digital imaging are _ and .
a. preprocessing; image interpretation
b. preprocessing; postprocessing
c. postprocessing; numerical analysis
d. numerical analysis; image interpretation
ANS: C
The special demands of digital imaging are postprocessing and numerical analysis.
6. A principal advantage of digital imaging over analog imaging is
. a. image brightness
, b. image manipulation
c. image inversion
d. window and level adjustment
ANS: A
A principal advantage of digital imaging over the earlier analog imaging is image
brightness.
7. Light incident on the eye must first pass through the . a. lens
b. cornea
c. retina
d. iris
ANS: B
Light incident on the eye must first pass through the cornea, a transparent protective
covering, and through the lens, where the light is focused onto the retina.
8. When light arrives at the retina, it is detected by the . a. retina
b. lens
c. rods and cones
d. pupil
ANS: C
When light arrives at the retina, it is detected by the rods and the cones.
9. Photopic vision is used for .
a. daylight vision
MULTIPLE CHOICE
1. Image perception is a scientific term for what we call visual . a.
search
b. acuity
c. sensitivity
d. training
ANS: C
Image perception is a scientific term for what we call visual sensitivity.
2. What is the basic illumination level unit?
a. Lumen per square meter
b. Candela
c. Lux
d. Lumen per square meter and lux
ANS: D
Illumination levels are measured in units of lumen per square meter or lux.
3. The decreasing luminous intensity with increasing distance from the source of light
follows
.
a. the law of gravity
b. Murphy’s law
, c. cosine law
d. the inverse square law
ANS: D
The decreasing luminous intensity with increasing distance from the source of light
follows the inverse square law.
4. The ambient light levels in the reading area should be . a. daylight bright
b. slightly dimmed
c. near darkness
d. complete darkness
ANS: C
The ambient light levels in the reading area should be near darkness.
5. The special demands of digital imaging are _ and .
a. preprocessing; image interpretation
b. preprocessing; postprocessing
c. postprocessing; numerical analysis
d. numerical analysis; image interpretation
ANS: C
The special demands of digital imaging are postprocessing and numerical analysis.
6. A principal advantage of digital imaging over analog imaging is
. a. image brightness
, b. image manipulation
c. image inversion
d. window and level adjustment
ANS: A
A principal advantage of digital imaging over the earlier analog imaging is image
brightness.
7. Light incident on the eye must first pass through the . a. lens
b. cornea
c. retina
d. iris
ANS: B
Light incident on the eye must first pass through the cornea, a transparent protective
covering, and through the lens, where the light is focused onto the retina.
8. When light arrives at the retina, it is detected by the . a. retina
b. lens
c. rods and cones
d. pupil
ANS: C
When light arrives at the retina, it is detected by the rods and the cones.
9. Photopic vision is used for .
a. daylight vision
