CAMRT Radiography Practice Exam

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In a 10-degree caudal projection of the coccyx, where is the coccyx demonstrated?

Above the symphysis pubis
At the level of the iliac crest
Below the symphysis pubis
In the sacrum

The correct answer is: Above the symphysis pubis

In a 10-degree caudal projection of the coccyx, the coccyx is best visualized above the symphysis pubis. This is due to the angling of the x-ray beam, which is directed slightly caudally to provide a clear view of the coccyx while minimizing superimposition with adjacent anatomical structures. By positioning the x-ray beam in this manner, the coccyx is projected into a location that is more optimal for visualization, making it appear higher than its usual anatomical position in relation to the symphysis pubis. The angles used during positioning not only help to separate the coccyx from the pubic symphysis but also aid in reducing the shadows created by other structures in the surrounding area, further enhancing the clarity of the coccyx on the radiograph.