How many degrees of caudal angulation is needed for the AP axial projection of the coccyx?

How many degrees of caudal angulation is needed for the AP axial projection of the coccyx?

• A. 15°
• B. 10°
• C. 20°
• D. 25°

Answer: (B)

For the AP axial projection of the coccyx, a caudal angulation of 10 degrees is required. This angulation is designed to direct the x-ray beam towards the coccyx, which is anatomically positioned at an angle posteriorly from its vertical line. By angling the x-ray beam caudally, this positioning helps to obtain a clear image of the coccyx without superimposition by the pubic symphysis or other pelvic structures. Additionally, the 10-degree angulation aids in optimizing the visualization of the area of interest, allowing for better assessment of potential fractures or abnormalities in the coccyx region.