For a cross-table lateral cervical spine radiograph, which vertebral level is used as the center of the image?

For a cross-table lateral cervical spine radiograph, which vertebral level is used as the center of the image?

• A. C3
• B. C4
• C. C6
• D. T1

Answer: (B)

Centering at the mid-cervical level, about the level of the thyroid cartilage (roughly C4), is used for a cross-table lateral cervical spine radiograph. This places the beam through the middle of the cervical column so the entire spine from C1 down through C7 (and into the cervicothoracic junction) stays within the image field with uniform magnification. If you center higher, you risk not including the lower cervical vertebrae and the thoracic inlet; if you center lower, the upper cervical spine can be off-center and shoulder overlap may obscure anatomy. Centering at C4 balances inclusion of all cervical levels and maintains consistent visualization across the spectrum.

Centering at the mid-cervical level, about the level of the thyroid cartilage (roughly C4), is used for a cross-table lateral cervical spine radiograph. This places the beam through the middle of the cervical column so the entire spine from C1 down through C7 (and into the cervicothoracic junction) stays within the image field with uniform magnification. If you center higher, you risk not including the lower cervical vertebrae and the thoracic inlet; if you center lower, the upper cervical spine can be off-center and shoulder overlap may obscure anatomy. Centering at C4 balances inclusion of all cervical levels and maintains consistent visualization across the spectrum.