(2) Posteroanterior projection. In the upright position shown in figure 3-38, the X-ray
beam enters from the posterior body surface. Thus, this position prepares the patient
for a PA (posteroanterior) projection.
Figure 3-38. In this upright position, a PA projection is produced.
b. Lateral Projections. Lateral projections are named for the side of the patient
closest to the film. (Thus, body position and projection names are identical.) In a left
lateral position (figure 3-39), the CR travels to the left lateral surface, thus producing a
left lateral projection. If the patient is placed in the right lateral position with the right
side of the body closest to the film (figure 3-40), he will be prepared for a right lateral
Figure 3-39. A left lateral position produces a left lateral projection.
Figure 3-40. A right lateral position, results in a right lateral projection.