What is the correct central ray placement for a lateral coccyx radiograph?

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Multiple Choice

What is the correct central ray placement for a lateral coccyx radiograph?

Explanation:
For a lateral coccyx radiograph, the beam should be aimed to the coccyx midline while minimizing overlap from surrounding pelvic structures. The coccyx sits just posterior and somewhat inferior to the ASIS, so directing the central ray to a point about 3.5 inches posterior to the ASIS and 2 inches inferior to the ASIS places the ray through the coccyx along the midline in a true lateral position. This alignment helps ensure the coccyx is well visualized without excessive superimposition of the pelvis or hips, producing a clear image of the distal spinal column. If the ray were aimed too anterior relative to the ASIS or at the wrong vertical level, the coccyx could be obscured or misrepresented in the projection.

For a lateral coccyx radiograph, the beam should be aimed to the coccyx midline while minimizing overlap from surrounding pelvic structures. The coccyx sits just posterior and somewhat inferior to the ASIS, so directing the central ray to a point about 3.5 inches posterior to the ASIS and 2 inches inferior to the ASIS places the ray through the coccyx along the midline in a true lateral position. This alignment helps ensure the coccyx is well visualized without excessive superimposition of the pelvis or hips, producing a clear image of the distal spinal column. If the ray were aimed too anterior relative to the ASIS or at the wrong vertical level, the coccyx could be obscured or misrepresented in the projection.

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