which of the following statementis true regarding the PA axial projection of the paranasal sinuses?
1. the cnteral ray is directed caudally to the orbitomeatal line
2. the petrous pyramids are projected into the lower one third of the orbits
3. the frontal sinuses are visualized
a. 1 only
b. 1 and 2 only
c. 2 and 3 only
d. 1,2 and 3
1. the cnteral ray is directed caudally to the orbitomeatal line
2. the petrous pyramids are projected into the lower one third of the orbits
3. the frontal sinuses are visualized
a. 1 only
b. 1 and 2 only
c. 2 and 3 only
d. 1,2 and 3
