Match the following choices with the correct question as they relate to radiographic grids.
a. grid frequency
b. grid ratio
c. contrast improvement factor
d. focussed grid
e. air-gap technique
f. Moire effect
g. grid cut-off
h. convergence point
i. Hollis Potter
j. Gustav Bucky
1. must be used at a specific SID
2. invented the moving grid assembly
3. commonly ranges from 85–103 lpi
4. K
1. d. focussed grid
2. i. Hollis Potter
3. a. grid frequency
4. c. contrast improvement factor
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