What is the standard collimation for an AP thoracic spine radiograph?

What is the standard collimation for an AP thoracic spine radiograph?

• A. Collimation to the cervical region
• B. Collimation to the thoracic region
• C. Collimation to the lumbar region
• D. Collimation to the entire spine

Answer: (B)

Limiting the exposure field to the region of interest is essential to reduce patient dose and improve image quality by cutting down on scatter. For an AP thoracic spine radiograph, collimation should be confined to the thoracic region, covering the full thoracic vertebrae from roughly T1 down to about T12, with a small margin superior and inferior to ensure all anatomy is captured. This keeps the beam focused on the thoracic spine and avoids irradiating the cervical or lumbar regions or the pelvis. Collimating to the cervical region would miss the lower thoracic vertebrae; to the lumbar region would omit the upper thoracic spine; and expanding to the entire spine would unnecessarily increase dose and scatter.

Limiting the exposure field to the region of interest is essential to reduce patient dose and improve image quality by cutting down on scatter. For an AP thoracic spine radiograph, collimation should be confined to the thoracic region, covering the full thoracic vertebrae from roughly T1 down to about T12, with a small margin superior and inferior to ensure all anatomy is captured. This keeps the beam focused on the thoracic spine and avoids irradiating the cervical or lumbar regions or the pelvis. Collimating to the cervical region would miss the lower thoracic vertebrae; to the lumbar region would omit the upper thoracic spine; and expanding to the entire spine would unnecessarily increase dose and scatter.