Figure 10-1. Grid alignment test tool at zero position centered.
f. Adjust the conefield to the following limits:
The width of the test tool.
Be sure only the center of the tool will be radiated.
g. Insert plugs in the other holes (other than the center one) or place lead
shields over them if there are no plugs (see figure 10-2).
h. Set the technical exposure of 5 mAs at 60 kVp. (Set the mAs first because
they will change the kVp).
i. Make the exposure.
j. Make additional exposures of each hole. Plug the ones that are not being
irradiated. When you make an exposure of the hole next to the arrow, include the
arrow. Be sure not to move the test tool until after all the exposures have been
k. Process the film.