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Which image represents positioning for the AP axial sacroiliac joints?

For the RPO and LPO positions for the sacroiliac joints:

Pathology Matching: Fracture through pedicles and anterior arch of C2 with forward displacement upon C3 Abnormal or exaggerated convex curvature of the Thoracic spine Avulsion fracture of spinous process of C7 A form of rheumatoid arthritis Impact fracture from axial loading of anterior and posterior arch of C1 Mild form of scoliosis and kyphosis developing during adolescence Congenital defect in which the posterior elements of the vertebrae fail to unite Most common at the level of L4-5 and may result in sciatica Forward displacement of one vertebra onto another A vertebra that takes on a characteristic of the adjacent region of the spine, e.g. cervical or lumbar ribs

What should be done to prevent mandibular rami from superimposing cervical vertebrae in the lateral projection of the cervical vertebral column?

A radiograph of an open-radiographic mouth projection reveals that the base of the skull is superimposed over the dens. What positioning error lead to this outcome?

How many degrees and in which direction should the CR be directed for an AP axial projection of the coccyx?

Image E is an AP projection. Which position is it?

A radiograph of an AP axial sacrum reveals that it is foreshortened, and the sacral foramina are not clearly seen. The patient was in an AP supine position, and the technologist angled the CR 10° cephalad.  What specific positioning error is present on this radiograph?

Refer to Image H, where is the CR directed?

A radiograph of a lateral thoracic spine reveals that there is excessive density along the posterior aspect of the spine. Even with good collimation, the scatter radiation reaching the IR obscures the spinous processes.  What can the technologist do to improve the visibility of the posterior structures of the spine?