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41 Cards in this Set

  • Front
  • Back
a device used to measure the thickness of anatomic parts
the measureable distance bt 2 adjacent densities
degree of blackness on radiograph
Exposure time
period of time during which xrays are permitted to leave xray tube
Inverse Square Law
intensity of the radiation varies inversely as the square of distance from source decreases
related to thousands of volts of electrical potential bt cathode and anode
Kinetic energy
energy related to motion
number of xrays produced over given period
one thousandth of an ampere
Sante's Rule
a method of estimating kilovoltage in relation to area thickness
Thermionic emission
process of releasing electrons from their atomic orbits by heat
scattering or reflecting radiation in the opposite direction from that which was intended
crossed grid
2 parallel or 2 focsed grids that are set at right angles
distortion of anatomical structures so that image appears longer
focused grid
a grid with a parallel center lead strip and inclined strips on either side
distortion of anatomic structures when image appears shorter than actual size
geometric distortion
variation in normal size or shape
geometric unsharpness
loss of detail due to distortion
deive made of lead strips embedded in spacing material placed bt patient and film, designed to absorb non-image forming radiation
grid cutoff
progressive decrease in transmitted xray
grid efficiency
ability of grid to absorb non-image forming radiation
grid factor
the amt of exposure needs to be increased to compensate for grids absorption
grid focus
the distance bt the source of an xray and the grid in which the grid is effective without grid cutoff
grid ratio
relation bt height of lead strips to the distance bt them
linear grid
grid in which lead strips are parallel
distortion of anatomic structures when inage appears larger then actual size
Potter-Bucky Diaphragm
moves grid across the xray
pseudofocused grid
grid with parallel lead strips that are progressively reduced in height toward the edge of the grid
radiographic contrast
density difference bt two adjacent areas
radiographic density
degree of blackness
radiographic detail
definition of edge of atomic structure
radiogrpahic quality
the ease in which details are perceived
scatter radiation
non0image forming radiation scattered in all directions
subject contrast
difference bt density and mass of two adjacent anatomic structures
unfocused grid
grid with leas strips that are parallel and are at right angles to film
detail and defintion - four things used to describe image
geometric unsharpness
atributed to
result of large focal spot or decreased SID
sedation may be needed
screens and films
radiographic quality depends on these three things
radiogrpahic density
radiogrpahic contrast
geometric factors that effect detail
density is influenced by what four things?
quantity of beam
quality of beam
type of tissue being radiographed
thickness of tissue being radiographed
greater radiogrpahic density may be produced by increasing
total # of xrays reaching film (mAs)
increased penetrating power of xrays (kVp)
increased developing time
temp of developer
radiographic contrast is influenced by what 5 things?
subject contrast
kVp level
scatter radiation
film type used
film fogging