Comparing digital tomosynthesis to cone-beam CT for position verification in patients undergoing partial breast irradiation.

Published

Journal Article

PURPOSE: To evaluate digital tomosynthesis (DTS) technology for daily positioning of patients receiving accelerated partial breast irradiation (APBI) and to compare the positioning accuracy of DTS to three-dimensional cone-beam computed tomography (CBCT). METHODS AND MATERIALS: Ten patients who underwent APBI were scanned daily with on-board CBCT. A subset of the CBCT projections was used to reconstruct a stack of DTS image slices. To optimize soft-tissue visibility, the DTS images were reconstructed in oblique directions so that the tumor bed, breast tissue, ribs, and lungs were well separated. Coronal and sagittal DTS images were also reconstructed. Translational shifts of DTS images were obtained on different days from the same patients and were compared with the translational shifts of corresponding CBCT images. Seventy-seven CBCT scans and 291 DTS scans were obtained from nine evaluable patients. RESULTS: Tumor beds were best visible in the oblique DTS scans. One-dimensional positioning differences between DTS and CBCT images were 0.8-1.7 mm for the six patients with clips present and 1.2-2.0 mm for the three patients without clips. Because of the limited DTS scan angle, the DTS registration accuracy along the off-plane direction is lower than the accuracy along the in-plane directions. CONCLUSIONS: For patients receiving APBI, DTS localization offers comparable accuracy to CBCT localization for daily patient positioning while reducing mechanical constraints and imaging dose.

Full Text

Duke Authors

Cited Authors

  • Zhang, J; Wu, QJ; Godfrey, DJ; Fatunase, T; Marks, LB; Yin, F-F

Published Date

  • March 1, 2009

Published In

Volume / Issue

  • 73 / 3

Start / End Page

  • 952 - 957

PubMed ID

  • 19135316

Pubmed Central ID

  • 19135316

Electronic International Standard Serial Number (EISSN)

  • 1879-355X

Digital Object Identifier (DOI)

  • 10.1016/j.ijrobp.2008.10.036

Language

  • eng

Conference Location

  • United States