Determination of system geometrical parameters and consistency between scans for contrast-enhanced digital breast tomosynthesis

  • Authors:

  • David A. Scaduto;Wei Zhao

  • Affiliations:

  • Department of Radiology, Stony Brook University, Stony Brook, New York;Department of Radiology, Stony Brook University, Stony Brook, New York

  • Venue:
  • IWDM'12 Proceedings of the 11th international conference on Breast Imaging
  • Year:
  • 2012

Quantified Score

Hi-index 0.00

Visualization

Abstract

Digital breast tomosynthesis (DBT) requires precise knowledge of acquisition geometry for accurate image reconstruction. Further, image subtraction techniques employed in dual-energy contrast-enhanced tomosynthesis require that scans be performed under nearly identical geometrical conditions. A geometrical calibration algorithm is developed to investigate system geometry and geometrical consistency of image acquisition between consecutive digital breast tomosynthesis scans, according to requirements for dual-energy contrast-enhanced tomosynthesis. Investigation of geometrical accuracy and consistency on a prototype DBT unit reveals accurate angular measurement, but potentially clinically significant differences in acquisition angles between scans. Further, a slight gantry wobble is observed, suggesting the need for incorporation of gantry wobble into image reconstruction, or improvements to system hardware.