Conference proceeding
Radiation dose differences between digital mammography and digital breast tomosynthesis are dependent on breast thickness
Progress in Biomedical Optics and Imaging - Proceedings of SPIE, Vol.9783, pp.97832R-97832R-7
03/22/2016
DOI: 10.1117/12.2216492
Abstract
Purpose
To evaluate the radiation dose derived from digital mammography (DM) and digital breast tomosynthesis (DBT) at
different tube current-exposure time product (mAs) and at 6 phantom thicknesses from 10 to 60 mm.
Materials and Methods
A total of 240 DM and DBT cranio-caudal (CC) phantom images were acquired at each thickness and at four exposure
levels (the baseline mAs, 50%, 25% and 12.5% the baseline mAs). The incident Air Kerma (K) at the surface of the
phantoms was measured using a solid state dosimeter. Mean Glandular Doses (MGD) were calculated for both
modalities (DM and DBT).
Results
DBT dose was greater than that of DM for all mAs at each phantom thickness. For a breast thickness of 50 mm (close to
average sized breast), the dose for DBT (2.32 mGy) was 13% higher than that for DM (2.05 mGy). The results also show
that the difference in MGD between DM and DBT was less for the thicker compared with the thinner phantom, this
difference being approximately a factor of 2.58 at 10 mm compared with a factor of 1.08 at 60 mm. While the MGD
increased with increasing phantom thickness for both modalities, the dose increase with DBT was less than for DM, with
the difference between 10 and 60 mm being a factor of 7 for DM and 3 for DBT.
Conclusion
The radiation dose from DBT was higher than that of DM and the difference in dose between DM and DBT decreases as
phantom thickness increases.
Details
- Title: Subtitle
- Radiation dose differences between digital mammography and digital breast tomosynthesis are dependent on breast thickness
- Creators
- Maram M Alakhras - The Univ. of Sydney (Australia)Claudia Mello-Thoms - The Univ. of Sydney (Australia)Roger Bourne - The Univ. of Sydney (Australia)Mary Rickard - The Univ. of Sydney (Australia)Jennifer Diffey - John Hunter Hospital (Australia)Patrick C Brennan - The Univ. of Sydney (Australia)
- Contributors
- Despina Kontos (Editor) - The Univ. of Pennsylvania Health System (United States)Thomas G Flohr (Editor) - Siemens Healthcare GmbH (Germany)Joseph Y Lo (Editor) - Duke Univ. Medical Ctr. (United States)
- Resource Type
- Conference proceeding
- Publication Details
- Progress in Biomedical Optics and Imaging - Proceedings of SPIE, Vol.9783, pp.97832R-97832R-7
- Publisher
- SPIE
- DOI
- 10.1117/12.2216492
- ISSN
- 1605-7422
- Language
- English
- Date published
- 03/22/2016
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Radiology
- Record Identifier
- 9984051524402771
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