For AP axial projection of the SI joints, where should the CR be placed?

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Study for the Clover Learning Radiography Positioning Test. Boost your skills with detailed questions, hints, and explanations. Master your radiography exam!

Multiple Choice

For AP axial projection of the SI joints, where should the CR be placed?

Explanation:
Positioning the AP axial view of the sacroiliac joints relies on a precise entry point to place the beam through the joints themselves. The sacroiliac joints lie just above the pubic symphysis, so the CR is placed about 1.5 inches superior to the pubic symphysis. This location, combined with the typical cephalad angulation, helps project the SI joints away from overlap and centers them in the image for a clear view. Placing the CR lower would miss the joints, while a point higher than about 1.5 inches risksincorrect centering or beam angulation.

Positioning the AP axial view of the sacroiliac joints relies on a precise entry point to place the beam through the joints themselves. The sacroiliac joints lie just above the pubic symphysis, so the CR is placed about 1.5 inches superior to the pubic symphysis. This location, combined with the typical cephalad angulation, helps project the SI joints away from overlap and centers them in the image for a clear view. Placing the CR lower would miss the joints, while a point higher than about 1.5 inches risksincorrect centering or beam angulation.

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