CAMRT Radiography Practice Exam 2026 – Comprehensive Test Prep

To effectively demonstrate the axillary portion of the lower, posterior left ribs, an RPO (right posterior oblique) position is optimal. This positioning allows the lower left ribs to be clearly visualized by placing them farther from the heart and minimizing superimposition from other structures.

Using full expiration during the imaging process helps to move the diaphragm upward, effectively allowing more room for the lower ribs to be shown without the interference of respiratory motion. In contrast, a position such as RPO with full inspiration might elevate the diaphragm, which can further obscure the lower ribs.

Additionally, the RPO position ensures that the left side of the thorax is rotated away from the imaging plate, enhancing visibility of the details in the axillary region of the lower ribs. This is particularly important as the ribs in this area tend to overlap with lung structures in a standard AP projection. Therefore, the combination of an RPO position with full expiration significantly aids in obtaining a clearer, more diagnostic image of the lower, posterior left ribs.