For a PA oblique sternal projection (RAO position),
1)a 30-inch (76-cm) or 40-inch (100-cm) SID is used.
2)the patient’s midcoronal plane is angled 15 to 20 degrees with the IR.
3)a long exposure time is used.
4)costal breathing is used.

1, 2, 3, and 4

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