lesson 5 Flashcards
filters out randomly deflected radiation that can blur an image produced by the machine
x-ray grid
made up of lead, a fabricated series of sections of radiopaque material
grid
- dark lines represent lead strips
- light lines represents interspace material
radiographic grid
will give grid lines on your radiograph
stationary grid
motion blurs out lead strips shadow
moving grid
all lead strips are parallel
linear parallel grid
has lead grid strips running parallel to both the long and short axis of the grid
crossed grid
the lead strips run along one axis and are tilted so that they lie on imaginary lines of the divergent x-ray beam
focused grid
types of moving grid
- Single-stroke grid
- reciprocating grid
- oscillating grid
cause the grid to move continuously across the film
single stroke grid
motor-driven, during exposure, moves back and forth several time
reciprocating grid
a powerful electromagnetic pull the grid on one side and releases it at the beginning of the exposure
oscillating grid
undesirable absorption of primary x-ray that can reduce optical density of the film
grid cut-off
images made when primary x-rays are absorbed in the grid strips
grid lines
types of grid cut-off
- off level grid
- off center grid
- off focus grid
- upside down grid
