Masi, M. (2017) Investigation on 3D dose distribution in digital breast tomosynthesis. Il nuovo cimento C, 40 (2). pp. 1-9. ISSN 1826-9885
|
Text
ncc11450.pdf - Published Version Download (568kB) | Preview |
Abstract
Monte Carlo calculations for dosimetry in digital breast tomosynthesis (DBT) require experimental validations. We measured the 3D dose distribution in a breast phantom in a DBT scan, using XR-QA2 radiochromic films. We positioned film pieces at the entrance surface, at the bottom surface and at four depths between adjacent slabs in the 5-slabs, 5-cm-thick phantom simulating a compressed breast with 50% glandular fraction. We irradiated the phantom at 40kV (half value layer 1.1mm Al) for three angular tilting of the beam central axis (±25◦ and 0◦ normal incidence). We determined the transverse and longitudinal distributions of the average dose in the phantom (in terms of air kerma normalized to the entrance air kerma), showing the angular dependence of the depth-resolved 3D dose distributions. In transverse planes the maximum dose variations were between 5.0% and 14.8% for normal incidence, and by 8.6% from the central to the tilted view. In the direction of the beam axis, the dose decreases up to about 71% from the entrance to the exit value. The extimated backscatter fraction was between 3% and 8%.
| Item Type: | Article |
|---|---|
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 17 Nov 2020 09:35 |
| Last Modified: | 17 Nov 2020 09:35 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/19891 |
Actions (login required)
 |
View Item |
