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JMARRT Image production
Terms in this set (70)
the front of a cassette can be made from which of the following materials?
what is the color of light emitted by a gadolinium oxysulfide rare earth intensifying screen?
the major difference b/w a 200 speed & a 400 speed screen is which of the following?
thickness of phosphor layer
an illuminator(viewbox)should have a fluorescent bulb with how much light intensity?
an unexposed radiographic film will have a slight density after processing.what is this density called?
base plus fog
which of the following materials would NOT be used in the interspaces of a grid?
when should a grid be used?
when radiographing body parts greater than 10cmwhen using high kVpwhen scatter radiation is high
what is a major benifit of a fixed kVp technique chart?
consistent radiographic contrast
which of the following is the main determinant in selecting a focal spot size?
the mA used
compared to a low ratio grid, a high ratio grid will do which of the following?
absorb more scatter radiation
when using a tube rating chart, which of the following must be taken into consideration?
speed of rotorfocal spot size
how can a compression band improve radiographic quality?
reduce scatter radiationreduce pt motionimprov radiographic contrast
which of the following test will determine the focal spot size?
star pattern test
off-distance grid cut-off is characterized by which of the following?
both sides of the image are underexposed
what is the main reason why beam filters are used in radiography?
reduces patient exposure
what is a 3-dimensional radiograph called that is produced by two angled views of the same structure?
the use of intensifying screens will have which of the following effects?
decrease patient dose
what does it mean if a radiographic film is duplitized?
emulsion is coated on two sides
which of the following is an example of a compensating filter?
Aluminum wedge filter
how can the production of scatter radiation be reduced?
used close collimation
which of the following is found in the emulsion of radiographic film?
which of the following is used to reduce the effect of scatter radiation?
the emulsion on a radiographic film is composed of silver halide crystals suspended in----------.
what is it called when an intensifying screen continues to fluoresce after the exposure is completed?
how much should kVp be increased when an extension cylinder is used to cone down on an area of interest?
which of the following materials is classified as a rare earth phosphor?
Exposure required without screens divided by exposure required with screens defines which of the following?
poor film-screen contact can be caused by which of the following?
warped cassette frontbent cassete framebroken cassette latch
which of the following is the least acceptable beam restricting device?
the base of radiographic film is made from which of the following materials?
400 speed rare eaarth screens require how much less radiation than 200 speed rare earth screens?
the image on radiographic film after exposure but before development is known as what?
a latent image
radiographic quality is achieved by balancing which of the following?
sharpness of detail and visibility of detail
off-center grid cut-off would demonstrate which of these/
one side of the image would be underexposed
a characteristic curve graphically demostrates the relationship b/w which of the following/
density and distortion
which of the following is NOT a primary factor in the production of a radiograph?
what is the purpose of a compensating filter?
produce uniform denisity in a radiograph
a fixed kVp technique chart uses which uses which of the following?
fixed kVp and variable mAs
why do the backs of some cassette contain lead?
stops backscatter from fogging the film
subtraction technique is used for which of the following situation?
which of the following tests will determine film-screen contact?
wire mesh test
b/c of the anode heel effect,where is the intensify of the x-ray beam the greatest?
at the anode end
how many lines per inch are normal in modern radiographic grids?
a radiographic grid should be used whenever kVp exceeds which of the following?
which of the following grid interspaces will produce the most satisfactory radiograph?
which of the following would NOT be classified as a beam restricting device?
which of the following causes the most repeated radiographs in a radioglogy department?
what is the function of a cassette?
maintain good film-screen contact
which of the following statements concerning a 16:1 ratio is true
effectively absorbs scatter raysdesigned for high kVp techniqueshas little positioning latitude
a compression band will improve which of the following radiographic qualities?
which of the four primary factors in the production of a radiograph is ragarded as the factor of penetration?
the height of the lead strips divided by the distance b/w the lead strips defines which of the following?
which of the following relates to the principle of light reflecting through the film base?
the rare earth phosphor,lanthanum oxybromide,emits what color light?
what type of screen was present when Roentgen discovered x-rays?
a properly formulated technique chart could accurately be used for what percentage of pts?
what does grid cut-off mean?
the primary x rays are absorbed
which of the following conditions will cause grid cut-off with a focused grid?
cr not centered to gridgrid angledtube angled acrossed the grid
grid focusing distance is associated with which of the following?
quality assurance programs suggest radiographic illuminators(viewboxs)should be clean how often?
which type of radiographic grid has lead lines running in two directions?
the image on a radiograph after development is known as what?
what is called when a phosphor absorbs x-rays and immediately emits light?
when mA is increased,what must be done to exposure time in order to maintain the same density?
where is the ionization chamber (photocell)located in an automatic exposure control (AEC) device?
b/w the pt and the image receptor
the distance b/w the lead strips of a foucused grid to a point where all lines converge is known as what?
grid focusing distance
which of the following is an advantage of the air gap technique?
eliminates the need for a grid
teleroentgenography refers to any radiograph taken at what SID?
which of the following affects grid efficency the most?
no practical amount of mAs can ever compensate for which of the following?
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