Where is the central ray directed for AP obliques of the SI joints?
at the level of the ASIS
1 inch medial from the upside ASIS
1 inch superior and 1 inch medial from the iliac crest
1 inch medial from the downside ASIS
1 inch medial from the upside ASIS
Rationale: AP oblique projections will require the patient to be placed into the RPO and LPO position. The SI joint furthest from the image receptor will open up on posterior oblique positions; therefore the CR should be directed 1 inch medial to the upside ASIS.
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