Which central ray angle range is used for the AP axial projection of the sacroiliac joints?

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Multiple Choice

Which central ray angle range is used for the AP axial projection of the sacroiliac joints?

Explanation:
The central ray is angled to place the beam along the plane of the sacroiliac joints, which lie obliquely in the pelvis. The sacroiliac joints slope roughly 30 degrees from the horizontal, so directing the CR cephalad by about 30 to 35 degrees lines up the beam with the joint spaces. This alignment helps open the joints and minimize superimposition of surrounding pelvic structures, giving a clearer view. Angles smaller than this may not open the joints adequately, while larger angles can distort anatomy. So, using about 30–35 degrees cephalad is the best range for the AP axial projection of the sacroiliac joints.

The central ray is angled to place the beam along the plane of the sacroiliac joints, which lie obliquely in the pelvis. The sacroiliac joints slope roughly 30 degrees from the horizontal, so directing the CR cephalad by about 30 to 35 degrees lines up the beam with the joint spaces. This alignment helps open the joints and minimize superimposition of surrounding pelvic structures, giving a clearer view. Angles smaller than this may not open the joints adequately, while larger angles can distort anatomy. So, using about 30–35 degrees cephalad is the best range for the AP axial projection of the sacroiliac joints.

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