What is the purpose of applying a three-to-five degree caudal angulation on a cervical thoracic spine (Swimmers) lateral radiograph?

The application of a three-to-five degree caudal angulation on a cervical thoracic spine (Swimmers) lateral radiograph is primarily performed to better visualize the C7 - T1 articulation. This specific angulation helps to separate the C7 and T1 vertebrae, which can otherwise be superimposed on each other due to their close anatomical proximity. By angling the x-ray beam caudally, radiologists can obtain a clearer view of this region, making it easier to identify any potential abnormalities, pathologies, or injuries that may be present.

Improving visualization of the C7 - T1 articulation is particularly important in diagnosing conditions such as cervical ribs, degenerative disc disease, or spinal stenosis, which may affect the functionality and health of the spine in that area. The technique ensures that the critical details of this articulation are not obscured, ultimately aiding in accurate diagnosis and treatment planning.