Abstract
Goals: Our goal was to compare the compression thickness, compression force, mean glandular dose and discomfort between 2D mammograms and DBT. The last goal was to compare the number of indeterminate mammographic results. Methods: All our initial symptomatic patients and follow-up patients having previously undergone breast surgery underwent DBT after its implementation in August 2010. An equal number of patients were selected from the DBT and 2D group. The factors looked at included compression thickness, compression force in newtons and mean glandular dose (MGD). These were calculated by the machine. A questionnaire was made for all the patients concerning the pain comparison between the two modalities from a 1 to 10 level. All mammographic reporting was performed by one radiologist and recorded. Results: 265 patients underwent DBT in our breast unit. 266 patients previously undergoing 2D mammograms were part of the comparison group. In the 2D group, 25 were less than 40 years of age; 69 were between 40 and 50; and 172 were more than 50 years. As for DBT, 36 were less than 40 years; 76 were between 40 and 50; and 153 were more than 50 years. The compression thickness was 60.7±0.8 in the DBT group. It was 55.3±0.8 in the 2D one. The compression force was 91.2±2.7 in the DBT and 111.0±2.8 in the 2D. The mean glandular dose (MGD) per image was 2.65±0.06 in DBT and 1.93±0.03 in 2D. Concerning the MGD per exam, it was 5.20±0.21 for DBT and 3.86±0.12 in 2D. Patients had significantly less discomfort with the DBT. There were only 3 patients with indeterminate (M3) results in the DBT group versus 21 in the 2D group. Conclusion: The mean glandular dose (MGD) was similar for small breasts, but the DBT mode had significantly higher doses for medium and large breasts. This was by a factor of 1.7. The indeterminate mammographic results were significantly lesser in number compared to the 2D group. The overall increased radiation dose has been found to be safe for the patients. With the added benefit of improvement in the image quality, our initial experience with DBT has been good. Disclosure of Interest: None Declared
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