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30 Cards in this Set

  • Front
  • Back
A film that has not been exposed will have a density of 0
False
The useful range of density in diagnostic radiology is .25 - 2
True
The steeper the straight line portion of the characteristic curve of a film the greater the contrast
True
The result of poor screen contact is blurring of the image.
True
The function of a slow speed screen is to produce fine detail.
True
The gain in detail is one of the advantages in using intensifying screens.
False
The intensification factor of screens varies with the thickness of the part to be radiographed.
False
Quantum mottle is a phenomenon of the x-ray beam.
False
Dirt on the surface of the intensifying screen will show up as a dark spot on the radiograph.
False
Screen lag is a desirable intensifying screen action.
False
Phosphorescence is the emission of light by a crystal after the activating source has ceased.
True
A high speed screen is used when detail is the most important factor.
False
A radiograph of a wire mesh screen is a good test for poor screen film contact.
True
An increase in kV applied to the x-ray tube increases the percentage of higher energy photons.
True
An increase of 5% in kV will approximately double the exposure.
False
The exposure rate is directly proportional to the kVp.
False
The number of electrons emitted by the cathode is primarily dependent upon the heat of the filament.
True
The speed at which the electrons travel from cathode to anode is dependent upon tube current.
False
An increase in the kV applied to the tube results in sorter wavelengths.
True
The image forming radiation that exposes the image receptor is called primary radiation.
False
The efficiency of a grid is its ability to remove scattered radiation.
True
Grid ratio is defined as the relationship between the height of the lead strip to the width the strip.
False
X-ray intensifying screens reduce the amount of radiation needed for an exposure by intensifying x-ray energy
False
A combination of fast screens and small focal spot would produce the best resolution.
False
A radiograph that exhibits a short scale of contrast can be described as an image having high contrast.
True
The function of contrast is to make detail visible.
True
Radiographic contrast is directly controlled by milliamperage.
False
Filtration of the x-ray beam affects the half-value layer.
True
The density of a radiograph is a measurement of the quality of radiation absorbed by the image receptor.
False
To reduce radiation exposure to the patient and still maintain good radiographic quality one should decrease mAs and increase the kVp.
True