For an AP AC joint projection without weights,
1. the central ray is centered to the AC joint.
2. the midcoronal plane is positioned parallel with the IR.
3. a grid is used if the patient's AP measurement is 6 inches (15 cm).
4. the patient's shoulders are positioned at equal distances from the IR.
a. 1 and 4 only
b. 3 only
c. 1, 2, and 4 only
d. 1, 2, 3, and 4
D
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