In scoliosis imaging, which projection better reduces breast dose?

• A. Lungs
• B. Heart
• C. Brain
• D. Breasts

Answer: (D)

In scoliosis imaging, protecting radiosensitive tissues is essential, and breast tissue is a prime concern, especially in younger patients. The way the patient is positioned and the projection used determines how much dose reaches the breasts. A PA (posterior–anterior) projection is preferred because the x-ray beam enters from the back and travels toward the front. This arrangement places the breasts farther from the x-ray source and increases attenuation before the beam reaches breast tissue, so fewer photons reach the breasts. Put simply, choosing the projection that minimizes exposure to breast tissue lowers the breast dose.

So, the focus is on reducing dose to the breasts, which is why this projection is the best choice for protecting that tissue during scoliosis imaging.