the grid lines must be running in the same direction as the movement of the laser beam that is scanning the imaging plate.
What is a downfall of using a parallel linear grid?
absorbs a large amount of the primary beam.
What does the ICRU do?
the International Commission of Radiologic Units and Measurements evaluate grid performance by two criteria; selectivity and contrast imporvement ability.
What is the Air-Gap technique?
places a space between the part and the grid. a 10" gap has the same effect as a 15:1 grid
What does a linear pattern look like?
lead strips run the length of the grid in one direction
What is Canting?
When the lead strips are angled to match the beam divergence
What is the "K" factor?
the contrast improvement ability which is a comparison of contrast of an image with a grid to that of an image without a grid
What does it mean when the grid is off level?
when the tube is angled, an off level grid error occurs with a focused grid and it is the only positioning error possible with a parallel grid.
T\F: Lower frequency grids have thinner lead strips.
False : Higher frequency grids have thinner leas strips.
T\F: As the lead content increases, the removal of scatter decreases, and the contrast decreases
False: As the lead increases, removal of scatter increases, and contrast increases.
