RAD 120 Final Exam Review with
Complete Solutions
_____ focal spot size is used when fine detail is required. - ANSWER-small
15% Rule - ANSWER-As kVp increases by 15%, mAs in cut in half in order to maintain
density and vice versa.
As kVp is decreased by 15%, mAs is doubled in order to maintain the same density.
A _____ is a device that is designed to remove scattered photons before they reach the
IR. - ANSWER-Grid
A misrepresentation of size or shape is - ANSWER-Distortion
As mAs increases, density _____ - ANSWER-increases
As size distortion decreases, the resolution of recorded detail - ANSWER-increases
At what point does the latent image become a visible image? (where) - ANSWER-in the
developer
(Ch 20)
Automatic processing of radiographic images requires approximately how many
seconds? - ANSWER-90
contrast - ANSWER-the visible differences between densities
Define the Half Value Layer - ANSWER-
Density - ANSWER-overall blackening of the film
Deterministic effects of ionizing radiation include all of the following except - ANSWER-
a. sterility
b. cataracts
c. skin erythema
d. cancer
d. cancer
Dose limits are specified for - ANSWER-the whole body
certain tissues
certain organs
, Fluoroscopic image is a _____ , _____. - ANSWER-dynamic, moving(live)
For fluoro procedures with a kVp of 100 or more, the protective apron must possess a
minimum of _____ lead equivalent. - ANSWER-0.5 mm
How do you produce an x-ray photon? - ANSWER-Current and voltage we have
thermionic emission at the filament in the cathode we produce electrons (boil the
electrons) off of the filament, then we apply a voltage which excites them and they travel
to the anode half of the speed of light, they want to go to the anode for negative to
positive, then we have the production of x-ray photon, 99% heat and 1% x-rays
Hydrogen
Carbon
Oxygen
Aluminum
Calcium
Molybdenum
Iodine
Barium
Tungsten
Lead - ANSWER-H 1
C6
O8
Al 13
Ca 20
-----
I 53
Ba 56
W 74
Pb 82
If we were to take two images, one is taken at 40" and the other at 72". What would be
the difference on the second image? - ANSWER-Detail and magnifiation
Inverse Square Law - ANSWER-Law of electrostatics that states that the force between
two charges is directly proportional to the product of their magnitudes and inversely
proportional to the square of the distance between them
Low Contrast - ANSWER-Many shades of gray
decreased contrast
high kVp
Long scale contrast
Large (wide) dynamic
range/window width
Medium used to capture the image - ANSWER-Image Receptor
Complete Solutions
_____ focal spot size is used when fine detail is required. - ANSWER-small
15% Rule - ANSWER-As kVp increases by 15%, mAs in cut in half in order to maintain
density and vice versa.
As kVp is decreased by 15%, mAs is doubled in order to maintain the same density.
A _____ is a device that is designed to remove scattered photons before they reach the
IR. - ANSWER-Grid
A misrepresentation of size or shape is - ANSWER-Distortion
As mAs increases, density _____ - ANSWER-increases
As size distortion decreases, the resolution of recorded detail - ANSWER-increases
At what point does the latent image become a visible image? (where) - ANSWER-in the
developer
(Ch 20)
Automatic processing of radiographic images requires approximately how many
seconds? - ANSWER-90
contrast - ANSWER-the visible differences between densities
Define the Half Value Layer - ANSWER-
Density - ANSWER-overall blackening of the film
Deterministic effects of ionizing radiation include all of the following except - ANSWER-
a. sterility
b. cataracts
c. skin erythema
d. cancer
d. cancer
Dose limits are specified for - ANSWER-the whole body
certain tissues
certain organs
, Fluoroscopic image is a _____ , _____. - ANSWER-dynamic, moving(live)
For fluoro procedures with a kVp of 100 or more, the protective apron must possess a
minimum of _____ lead equivalent. - ANSWER-0.5 mm
How do you produce an x-ray photon? - ANSWER-Current and voltage we have
thermionic emission at the filament in the cathode we produce electrons (boil the
electrons) off of the filament, then we apply a voltage which excites them and they travel
to the anode half of the speed of light, they want to go to the anode for negative to
positive, then we have the production of x-ray photon, 99% heat and 1% x-rays
Hydrogen
Carbon
Oxygen
Aluminum
Calcium
Molybdenum
Iodine
Barium
Tungsten
Lead - ANSWER-H 1
C6
O8
Al 13
Ca 20
-----
I 53
Ba 56
W 74
Pb 82
If we were to take two images, one is taken at 40" and the other at 72". What would be
the difference on the second image? - ANSWER-Detail and magnifiation
Inverse Square Law - ANSWER-Law of electrostatics that states that the force between
two charges is directly proportional to the product of their magnitudes and inversely
proportional to the square of the distance between them
Low Contrast - ANSWER-Many shades of gray
decreased contrast
high kVp
Long scale contrast
Large (wide) dynamic
range/window width
Medium used to capture the image - ANSWER-Image Receptor
