So Young Jung RT, Presenter: Nothing to Disclose

Meoung Mi Jang, Abstract Co-Author: Nothing to Disclose

Kyung Sun Lee, Abstract Co-Author: Nothing to Disclose

Sung Suk Bae, Abstract Co-Author: Nothing to Disclose

Dong Sung Kim, Abstract Co-Author: Nothing to Disclose

Jung Min Chang MD, Abstract Co-Author: Nothing to Disclose

Ka Hee Jung, Abstract Co-Author: Nothing to Disclose

Early clinical results with DBT are very promising. However, it has been reported that the radiation dose of DBT is higher than MG. To investigate how breast density characteristics and the presence of cancer can affect the dose of digital breast tomosynthesis (DBT) compared with conventional digital mammography(MG).  

Between January 2012 and April 2012, DBT and MG were performed in 211 women (mean age 50.3;range 25~77 years), including 148 patients with breast cancer. For Phantom experiments, the radiation dose of both DBT and MG were compared using ACR phantom (CIRS model15). For clinical data evaluation, the radiation dose of DBT and MG were compared between breast density (BI-RADS grade 1,2 [N=50], Grade3 [N=94] and Grade4 [N=67]). In addition, the radiation dose of DBT and MG were compared in breasts with cancers and contralateral normal breasts in patient with breast cancer [N=148].

The radiation dose of DBT was 1.32 mGy, which was 20% higher than MG(1.1mGy)in phantom study. According to the composition of the breast density in 211 women, DBT dose increased 44% in breast density grade1,2 (p=0.00), 11% in grade 3 (p=0.01), and 1% in grade 4 (p=0.585) when compared to MG. The dose differences between DBT and MG were significant in all breast density except for grade 4. The dose increase in DBT compared to MG was 9% in the breast with cancer, and 15% in normal contralateral breasts.

The radiation dose of DBT was generally higher compared to MG. However, the difference of radiation dose between DBT and MG grew smaller with higher breast density, and breast with cancers.

In evaluation of dense breast, and breast with malignancy, concerns on increased dose could be minimized. Because in that case, the minimal dose differences were noted between DBT and MG is.

Jung, S, Jang, M, Lee, K, Bae, S, Kim, D, Chang, J, Jung, K, The Radiation Dose of Breast Tomosynthesis Comparison with Conventional Digital Mammography  .  Radiological Society of North America 2013 Scientific Assembly and Annual Meeting, December 1 - December 6, 2013 ,Chicago IL. http://archive.rsna.org/2013/13013057.html