For an AP chest projection obtained with a mobile x-ray unit,
1. the IR is positioned parallel with the midcoronal plane.
2. the image is obtained without the use of a grid.
3. the manubrium is superimposed over the fourth thoracic vertebra.
4. 10 or 11 posterior ribs are demonstrated above the diaphragm.
a. 1 and 2 only
b. 1, 2, and 3 only
c. 3 and 4 only
d. 1, 2, 3, and 4
B
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