b. Anteroposterio/posteroanterior Trunk and Skull. For an anteroposterior
(AP) or posteroanterior (PA) projection, the "R" or "L" marker should be placed on the corresponding
side of the film cassette. See figures 4-29, 4-30, and 4-31.
Figure 4-29. The R corresponds to side of body demonstrated on that side of the film.
Figure 4-30. Full field coverage is demonstrated here. Either letter marker could be
used, as long as it is placed with the corresponding side.
Figure 4-31. Either the R or L marker could be used in labeling the AP view of the