In a PA coccyx projection, what should the tube tilt be?

In a PA (posteroanterior) projection of the coccyx, the proper tube angle is directed 5-10 degrees cephalad. This is due to the anatomical orientation of the coccyx, which is naturally angled posteriorly. By tilting the X-ray tube cephalad, the beam aligns better with the anatomy of the coccyx, allowing for improved visualization and detail of the area being examined. This angle helps to minimize distortion and ensure that the coccyx appears as clearly as possible on the radiograph.

Additionally, applying this cephalad tilt assists in reducing the projection of surrounding structures and helps to better differentiate the coccyx from the sacrum and other anatomical landmarks, resulting in a more effective diagnostic image. Proper understanding and application of tube angles are crucial in obtaining clear and accurate X-ray images in radiographic positioning.