Bushong - Chapter 10, 11, and 13 Exam
well answered to pass
The contrast improvement factor formula is:
a. k = contrast improvement with grid / contrast improvement without grid
b. k = contrast improvement without grid / contrast improvement / contrast
improvement with grid
c. k = contrast improvement with grid * contrast improvement without grid
d. k = contrast improvement without grid + contrast improvement with grid -
correct answer ✔✔a. k = contrast improvement with grid / contrast improvement
without grid
At techniques above 90 kVp, it is best to use with grids with ____________ ratio
or higher.
a. 5:1
b. 6:1
c. 8:1
d. 12:1 - correct answer ✔✔c. 8:1
Contrast on a radiographic image is highest when the amount of _____________
is the lowest.
,a. patient tissue
b. photoelectric absorption
c. transmitted x-rays
d. Compton scatter - correct answer ✔✔d. Compton scatter
The slope of the ___________ portion of the characteristic curve shows the film
contrast.
a. base
b. shoulder
c. toe
d. straight line - correct answer ✔✔d. straight line
If 10% of the viewbox light is transmitted through an area of film, what is the
optical density of the area?
a. 0
b. 1
c. 2
d. 3 - correct answer ✔✔b. 1
Radiographic image quality is improved when the __________ is increased.
a. source to image distance
, b. focal spot size
c. film speed
d. screen speed - correct answer ✔✔a. source to image distance
Subject contrast is affected by:
a. mAs
b. focal spot size
c. patient thickness
d. voltage ripple - correct answer ✔✔c. patient thickness
The main disadvantage of using parallel grids is:
a. Grid cut-off
b. higher patient dose
c. contrast loss
d. lowered selectivity - correct answer ✔✔a. grid cut-off
A grid is constructed with _______ strips and ____________ interspace material.
a. radiopaque, radiolucent
b. radiopaque, radiopaque
c. radiolucent, radiopaque
well answered to pass
The contrast improvement factor formula is:
a. k = contrast improvement with grid / contrast improvement without grid
b. k = contrast improvement without grid / contrast improvement / contrast
improvement with grid
c. k = contrast improvement with grid * contrast improvement without grid
d. k = contrast improvement without grid + contrast improvement with grid -
correct answer ✔✔a. k = contrast improvement with grid / contrast improvement
without grid
At techniques above 90 kVp, it is best to use with grids with ____________ ratio
or higher.
a. 5:1
b. 6:1
c. 8:1
d. 12:1 - correct answer ✔✔c. 8:1
Contrast on a radiographic image is highest when the amount of _____________
is the lowest.
,a. patient tissue
b. photoelectric absorption
c. transmitted x-rays
d. Compton scatter - correct answer ✔✔d. Compton scatter
The slope of the ___________ portion of the characteristic curve shows the film
contrast.
a. base
b. shoulder
c. toe
d. straight line - correct answer ✔✔d. straight line
If 10% of the viewbox light is transmitted through an area of film, what is the
optical density of the area?
a. 0
b. 1
c. 2
d. 3 - correct answer ✔✔b. 1
Radiographic image quality is improved when the __________ is increased.
a. source to image distance
, b. focal spot size
c. film speed
d. screen speed - correct answer ✔✔a. source to image distance
Subject contrast is affected by:
a. mAs
b. focal spot size
c. patient thickness
d. voltage ripple - correct answer ✔✔c. patient thickness
The main disadvantage of using parallel grids is:
a. Grid cut-off
b. higher patient dose
c. contrast loss
d. lowered selectivity - correct answer ✔✔a. grid cut-off
A grid is constructed with _______ strips and ____________ interspace material.
a. radiopaque, radiolucent
b. radiopaque, radiopaque
c. radiolucent, radiopaque
