Which of the following is the correct angle for the central ray when performing a lateral thoracic spine projection?

For a lateral thoracic spine projection, the central ray is typically positioned perpendicular to the image receptor. However, while performing such a radiographic projection, it is important to ensure optimal visualization of the vertebrae and to avoid superimposition.

In this context, angling the central ray cephalically helps to achieve a more efficient alignment of the spine as well as to reduce the curvature effect that might obscure vertebral levels in certain patients. The 15 degrees cephalic angle is specifically designed to counteract the natural kyphotic curve of the thoracic spine, enhancing the clarity of the images obtained.

This adjustment is crucial, especially in patients with varying body habitus, as it aids in ensuring that the central ray aligns with the area of interest effectively. Therefore, utilizing a cephalic angle in this scenario is essential for acquiring high-quality images for diagnostic purposes.