Evaluation of scatter effects on image quality for breast tomosynthesis

Wu Gang, James G. Mainprize, John M Boone, Martin J. Yaffe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

Digital breast tomosynthesis uses a limited number (typically 10-20) of low-dose x-ray projections to produce a three-dimensional (3D) volume tomographic reconstruction of the breast. The purpose of this investigation was to characterize and evaluate the effect of scatter radiation on image quality for breast tomosynthesis. Generated by a Monte Carlo simulation method, scatter point spread functions (PSF) were convolved over the field of view (FOV) to estimate the distribution of scatter for each angle of tomosynthesis projection. The results demonstrated that in the absence of scatter reduction techniques, the scatter-to-primary ratio (SPR) levels for the average breast (e.g. 12 cm diameter 50/50 composition semi-cylindrical phantom) are quite high (-0.4 at the centre of mass), and as expected, increased with increased breast thickness and with larger FOV. Associated with such levels of x-ray scatter are cupping artifacts, as well as reduced accuracy in reconstruction values. The effect of x-ray scatter on the contrast, noise, and signal-difference-to-noise ratio (SDNR) in tomosynthesis reconstruction was measured as a function of tumour size. For example, the contrast in the reconstructed central slice image of a tumour-like mass (14 mm in diameter) was degraded by 30% while the inaccuracy of the voxel value was 28%, and the reduction of SDNR was 60%. We have quantified the degree to which scatter degrades the image quality over a wide range of parameters relevant to breast tomosynthesis, including x-ray beam energy, breast thickness, breast diameter, and breast composition. However, even without a scatter rejection device, the contrast and SDNR in the reconstructed tomosynthesis slice is higher than that of conventional mammographie projection images acquired with a grid at an equivalent total exposure.

Original languageEnglish (US)
Title of host publicationProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume6510
EditionPART 1
DOIs
StatePublished - 2007
EventMedical Imaging 2007: Physics of Medical Imaging - San Diego, CA, United States
Duration: Feb 18 2007Feb 22 2007

Other

OtherMedical Imaging 2007: Physics of Medical Imaging
CountryUnited States
CitySan Diego, CA
Period2/18/072/22/07

Keywords

  • Breast imaging
  • Contrast
  • Image quality
  • SDNR
  • Tomosynthesis
  • X-ray scatter

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Gang, W., Mainprize, J. G., Boone, J. M., & Yaffe, M. J. (2007). Evaluation of scatter effects on image quality for breast tomosynthesis. In Progress in Biomedical Optics and Imaging - Proceedings of SPIE (PART 1 ed., Vol. 6510). [65101T] https://doi.org/10.1117/12.708531