simplest; all lead grid strips are parallel; clean up scatter radiation in only one direction
High quality grids can clean up how much scatter?
80-90% of scatter
Is the k higher for higher ratio grids?
yes
Off-center grid
cutoff on one side than the other due to central ray not centered on grid
Oscillating grids
positioned in a frame , a powerful electromagnet pulls the grid to one side and releases it at the beginning of the exposure, and oscillates in a circular fashion
What material is mostly used for the grid strips?
lead
The number of grid strips or grid lines per ich or centimeter
Grid Frequency
If a grid has a high frequency will it show more or less grid lines?
less grid lines
Focused grids
lead lines lie on the imaginary radial lines of a circle centered at the focal spot so they coincide with divergence of x ray beam
