How does radiation dose differ between 2D mammography and tomosynthesis?

How does radiation dose differ between 2D mammography and tomosynthesis?

• A. Tomosynthesis adds exposure for the 3D data set, increasing dose relative to 2D alone; modern protocols strive to minimize dose while preserving diagnostic performance, and cumulative dose remains within guidelines.
• B. Tomosynthesis reduces dose compared with 2D.
• C. There is no dose difference.
• D. 2D mammography yields no dose.

Answer: (A)

Tomosynthesis increases radiation dose because it builds a 3D view by taking multiple low-dose x-ray projections across the breast. Each projection adds to the patient’s total exposure, so the overall dose for a tomosynthesis exam is higher than a single 2D mammogram. However, modern protocols optimize this added exposure by reducing per-view dose, using fewer projections when possible, and often relying on synthetic 2D images derived from the tomosynthesis data to minimize the need for an extra 2D exposure. Even with these optimizations, the cumulative dose stays within established safety guidelines. This is why the correct choice reflects that tomosynthesis adds exposure for the 3D data set, increasing dose relative to 2D alone, with ongoing dose minimization and guideline-based limits.

Tomosynthesis increases radiation dose because it builds a 3D view by taking multiple low-dose x-ray projections across the breast. Each projection adds to the patient’s total exposure, so the overall dose for a tomosynthesis exam is higher than a single 2D mammogram. However, modern protocols optimize this added exposure by reducing per-view dose, using fewer projections when possible, and often relying on synthetic 2D images derived from the tomosynthesis data to minimize the need for an extra 2D exposure. Even with these optimizations, the cumulative dose stays within established safety guidelines. This is why the correct choice reflects that tomosynthesis adds exposure for the 3D data set, increasing dose relative to 2D alone, with ongoing dose minimization and guideline-based limits.