protocol 1 (mean ± SD)

protocol 2 (mean ± SD)

p-value

CTDI (mGy)

12.4 ± 5.1

16.3 ± 7.8

0.11

DLP (mGy·cm)

297.4 ± 129.7

350.37 ± 126.8

0.533

ED (mSv)

4.87 ± 2.3

5.12 ± 2.8

0.533

Breast surface dose (mSv)

left

9.41 ± 0.6

23.8 ± 1.2

0.027

right

10 ± 0.4

24.08 ± 0.7

0.026