To Successfully Demonstrate the Ethmoidal and Sphenoidal Sinuses on the SMV

Multiple Choice

To successfully demonstrate the ethmoidal and sphenoidal sinuses on the SMV projection, which of the following must occur?
1) The patient must be recumbent.
2) The infraorbitomeatal line must be parallel with the IR.
3) The central ray must be perpendicular to the infraorbitomeatal line and horizontal.

A) 1 and 2
B) 1 and 3
C) 2 and 3
D) 1, 2, and 3