For an Externally Rotated AP Oblique Knee Projection, the

Multiple Choice

For an externally rotated AP oblique knee projection, the
1) leg is externally rotated until an imaginary line connecting the femoral epicondyles is at a 45-degree angle with the IR.
2) leg is internally rotated until an imaginary line connecting the femoral epicondyles is at a 45-degree angle with the IR.
3) central ray is aligned parallel with the tibia plateau.
4) central ray is centered at a level 0.75 inch (2 cm) distal to the medial femoral epicondyles.

A) 1 and 4 only
B) 1 and 3 only
C) 2 and 4 only
D) 1, 3, and 4 only