VTNE practice: Diagnostic Imaging
Questions and answers
What is a physical property of x-rays? - ANSWER-Travel in straight lines
As the wavelength of x-ray photons shortens, the energy of the x-ray beam will -
ANSWER-Increase
The kVp setting on an x-ray machine controls the - ANSWER-Quality of the x-ray beam
The milliampere-seconds (mAs) setting on an x-ray machine controls the -
ANSWER-Quantity of x-rays emitted
During an exposure, electrons in the x-ray tube travel from the - ANSWER-Cathode to
the anode
To produce x-rays, a great deal of energy in an x-ray tube is converted into heat. The
ratio of heat generated to x-ray production is generally considered to be -
ANSWER-99%:1%
The acceleration of the electrons and their ultimate striking energy is determined by the
- ANSWER-Kiloyoltage (kVp)
When depressing the "prep" switch on a rotating anode x-ray machine, you are
effectively - ANSWER-Heating up the filament and spinning the rotating anode
Regarding the production of x-rays in the x-ray tube, the - ANSWER-Cathode includes
the filament and the focusing cup
What transformer in an x-ray machine controls the temperature of the filament? -
ANSWER-Step-down transformer
The heel effect is going to be more noticeable with - ANSWER-Larger film, shorter
focal-film distance, and lower kVp
,Full-wave rectification means that - ANSWER-120 pulses of x-rays are produced per
second.
What is the minimum distance in feet that a safelight in the darkroom should be away
from the work site? - ANSWER-4
If using both blue- and green-sensitive films, what type of safelight should you use? -
ANSWER-Red
The main purpose of the x-ray developer is to - ANSWER-Convert the exposed silver
halide crystals into black metallic silver
The main purpose of the x-ray fixer is to - ANSWER-Clear away the unexposed,
undeveloped silver halide crystals
A safelight illumination test was performed in the darkroom. On processing the film, you
see various gradations of blackness on your film. The area exposed for the longest
period of time is - ANSWER-Darkest
After you manually process a film, you notice that there is a green area of about 1/2 inch
along one narrow edge of the film. This is due to the area not being -
ANSWER-Developed or fixed
You notice that there is a clear line at the top of the shorter edge of a radiograph that
you have manually processed. This is due to the area not being - ANSWER-Developed
You are looking at a film that is totally clear except for a bit of black that you notice along
the edges. Your film has not been - ANSWER-Exposed to radiation
You have a film in front of you that has a relatively clear edge all the way around the
radiograph. This is because of - ANSWER-Collimation
The remaining silver halide crystals from exposed x-ray film are removed in the -
ANSWER-Fixer
Which of the following would cause the image on a processed x-ray film to be fogged?
a.Two films in the same cassette
b.kVp too low
c.Film stored in an area of high room temperature
,d.Focal-film distance too long - ANSWER-c.Film stored in an area of high room
temperature
What should be the maximum intensity of the bulb in a safelight in developing rooms? -
ANSWER-15 watts
A bullet fragment on a film appears as a - ANSWER-White mark
A crease in the film after exposure but before processing will likely appear as a -
ANSWER-Black crescent mark
Safelight fogging on a radiograph appears as a - ANSWER-Diffuse grayish area
The cells that are most susceptible to the hazards of ionizing radiation are -
ANSWER-The rapidly dividing cells of the intestinal lining, neoplastic cells, and gonad
cells
A sievert (Sv) is the - ANSWER-Unit of radiation dose equivalent to the absorbed dose
in tissue
A radiation film badge worn at the collar level - ANSWER-Monitors exposure of the
thyroid gland and lenses of the eyes
When taking radiographs, you should whenever possible use - ANSWER-Decreased
exposure time, increased distance from radiation sources, and increased shielding
There is a gloved hand visible on a radiograph. This is - ANSWER-A real concern,
because the hand has been exposed to radiation
A small filament produces an image of - ANSWER-Greater detail than a large filament
You are preparing to take a radiograph, and you want to confirm that you have set the
correct mAs of 15. Which of the following scenarios will give you 15 mAs?
a.300 mA and 1/10 sec
b.300 mA and 1/20 sec
c.150 mA and 1/15 sec
d.150 mA and 1/20 sec - ANSWER-b.300 mA and 1/20 sec
300 × 1/20 sec = 15 mAs.
, If you were going to decrease the focal-film distance from 100 cm to 50 cm, what should
your new mAs be if the old mAs was 16? - ANSWER-4.0 mAs
Scatter radiation on a film is more noticeable if there is - ANSWER-Higher kVp, thicker
patient, and larger field size
To get more density on a film, you should do what to the kVp and mAs? -
ANSWER-Increase either or both
Sante's rule states that when setting up a technique chart, you should use what base
kVp for the abdomen? - ANSWER-(2 × thickness [cm]) + 40
Because of the relationship between milliamp (mA) and mAs, as you increase the mA,
you can - ANSWER-Decrease the length of the exposure, so that there is less chance
of movement
The crystals of high-speed screens, as compared to similar types of par screens, are -
ANSWER-Bigger, and there is less detail
The main advantage of fast-speed screens and films is that - ANSWER-Lower exposure
factors can be used, which can allow use of a smaller focal spot.
If using rare-earth screens, what spectrum of light must the film be sensitive to? -
ANSWER-Green range
You are looking at a radiograph that appears gray overall. This is best described as a -
ANSWER-Low-contrast film with many steps but few changes between each step
A radiograph in front of you appears dark. You note that the bones are gray. You are
best to do what for the next radiograph - ANSWER-Decrease kVp
Grid cutoff can be described as - ANSWER-Incorrect use of the grid, so that the grid
absorbs more radiation than it should
You have taken a radiograph using 10 mAs and 60 kVp. To double the radiographic
density for a second film, you should use - ANSWER-200 mA 1/10 sec, 60 kVp
You want to set up an abdominal radiography technique chart. All of the following
factors should be standardized except
a.Whether to use a grid
Questions and answers
What is a physical property of x-rays? - ANSWER-Travel in straight lines
As the wavelength of x-ray photons shortens, the energy of the x-ray beam will -
ANSWER-Increase
The kVp setting on an x-ray machine controls the - ANSWER-Quality of the x-ray beam
The milliampere-seconds (mAs) setting on an x-ray machine controls the -
ANSWER-Quantity of x-rays emitted
During an exposure, electrons in the x-ray tube travel from the - ANSWER-Cathode to
the anode
To produce x-rays, a great deal of energy in an x-ray tube is converted into heat. The
ratio of heat generated to x-ray production is generally considered to be -
ANSWER-99%:1%
The acceleration of the electrons and their ultimate striking energy is determined by the
- ANSWER-Kiloyoltage (kVp)
When depressing the "prep" switch on a rotating anode x-ray machine, you are
effectively - ANSWER-Heating up the filament and spinning the rotating anode
Regarding the production of x-rays in the x-ray tube, the - ANSWER-Cathode includes
the filament and the focusing cup
What transformer in an x-ray machine controls the temperature of the filament? -
ANSWER-Step-down transformer
The heel effect is going to be more noticeable with - ANSWER-Larger film, shorter
focal-film distance, and lower kVp
,Full-wave rectification means that - ANSWER-120 pulses of x-rays are produced per
second.
What is the minimum distance in feet that a safelight in the darkroom should be away
from the work site? - ANSWER-4
If using both blue- and green-sensitive films, what type of safelight should you use? -
ANSWER-Red
The main purpose of the x-ray developer is to - ANSWER-Convert the exposed silver
halide crystals into black metallic silver
The main purpose of the x-ray fixer is to - ANSWER-Clear away the unexposed,
undeveloped silver halide crystals
A safelight illumination test was performed in the darkroom. On processing the film, you
see various gradations of blackness on your film. The area exposed for the longest
period of time is - ANSWER-Darkest
After you manually process a film, you notice that there is a green area of about 1/2 inch
along one narrow edge of the film. This is due to the area not being -
ANSWER-Developed or fixed
You notice that there is a clear line at the top of the shorter edge of a radiograph that
you have manually processed. This is due to the area not being - ANSWER-Developed
You are looking at a film that is totally clear except for a bit of black that you notice along
the edges. Your film has not been - ANSWER-Exposed to radiation
You have a film in front of you that has a relatively clear edge all the way around the
radiograph. This is because of - ANSWER-Collimation
The remaining silver halide crystals from exposed x-ray film are removed in the -
ANSWER-Fixer
Which of the following would cause the image on a processed x-ray film to be fogged?
a.Two films in the same cassette
b.kVp too low
c.Film stored in an area of high room temperature
,d.Focal-film distance too long - ANSWER-c.Film stored in an area of high room
temperature
What should be the maximum intensity of the bulb in a safelight in developing rooms? -
ANSWER-15 watts
A bullet fragment on a film appears as a - ANSWER-White mark
A crease in the film after exposure but before processing will likely appear as a -
ANSWER-Black crescent mark
Safelight fogging on a radiograph appears as a - ANSWER-Diffuse grayish area
The cells that are most susceptible to the hazards of ionizing radiation are -
ANSWER-The rapidly dividing cells of the intestinal lining, neoplastic cells, and gonad
cells
A sievert (Sv) is the - ANSWER-Unit of radiation dose equivalent to the absorbed dose
in tissue
A radiation film badge worn at the collar level - ANSWER-Monitors exposure of the
thyroid gland and lenses of the eyes
When taking radiographs, you should whenever possible use - ANSWER-Decreased
exposure time, increased distance from radiation sources, and increased shielding
There is a gloved hand visible on a radiograph. This is - ANSWER-A real concern,
because the hand has been exposed to radiation
A small filament produces an image of - ANSWER-Greater detail than a large filament
You are preparing to take a radiograph, and you want to confirm that you have set the
correct mAs of 15. Which of the following scenarios will give you 15 mAs?
a.300 mA and 1/10 sec
b.300 mA and 1/20 sec
c.150 mA and 1/15 sec
d.150 mA and 1/20 sec - ANSWER-b.300 mA and 1/20 sec
300 × 1/20 sec = 15 mAs.
, If you were going to decrease the focal-film distance from 100 cm to 50 cm, what should
your new mAs be if the old mAs was 16? - ANSWER-4.0 mAs
Scatter radiation on a film is more noticeable if there is - ANSWER-Higher kVp, thicker
patient, and larger field size
To get more density on a film, you should do what to the kVp and mAs? -
ANSWER-Increase either or both
Sante's rule states that when setting up a technique chart, you should use what base
kVp for the abdomen? - ANSWER-(2 × thickness [cm]) + 40
Because of the relationship between milliamp (mA) and mAs, as you increase the mA,
you can - ANSWER-Decrease the length of the exposure, so that there is less chance
of movement
The crystals of high-speed screens, as compared to similar types of par screens, are -
ANSWER-Bigger, and there is less detail
The main advantage of fast-speed screens and films is that - ANSWER-Lower exposure
factors can be used, which can allow use of a smaller focal spot.
If using rare-earth screens, what spectrum of light must the film be sensitive to? -
ANSWER-Green range
You are looking at a radiograph that appears gray overall. This is best described as a -
ANSWER-Low-contrast film with many steps but few changes between each step
A radiograph in front of you appears dark. You note that the bones are gray. You are
best to do what for the next radiograph - ANSWER-Decrease kVp
Grid cutoff can be described as - ANSWER-Incorrect use of the grid, so that the grid
absorbs more radiation than it should
You have taken a radiograph using 10 mAs and 60 kVp. To double the radiographic
density for a second film, you should use - ANSWER-200 mA 1/10 sec, 60 kVp
You want to set up an abdominal radiography technique chart. All of the following
factors should be standardized except
a.Whether to use a grid
