Proposing rapid source pulsing for improved super-resolution in digital breast tomosynthesis

Raymond J. Acciavatti; Trevor L. Vent; Bruno Barufaldi; E. Paul Wileyto; Peter B. Noël; Andrew D. A. Maidment

doi:10.1117/12.2542551

16 March 2020 Proposing rapid source pulsing for improved super-resolution in digital breast tomosynthesis

Raymond J. Acciavatti, Trevor L. Vent, Bruno Barufaldi, E. Paul Wileyto, Peter B. Noël, Andrew D. A. Maidment

Proceedings Volume 11312, Medical Imaging 2020: Physics of Medical Imaging; 113125G (2020) https://doi.org/10.1117/12.2542551
Event: SPIE Medical Imaging, 2020, Houston, Texas, United States

Abstract

Our previous work showed that digital breast tomosynthesis (DBT) systems are capable of super-resolution, or subpixel resolution relative to the detector. Using a bar pattern phantom, it is possible to demonstrate that there are anisotropies in super-resolution throughout the reconstruction. These anisotropies are lessened in acquisition geometries with narrow spacing between source positions. This paper demonstrates that by re-arranging the source positions in the scan, the anisotropies can be minimized even further. To this end, a theoretical model of the reconstruction of a high-frequency sinusoidal test object was developed from first principles. We modeled the effect of clustering additional source positions around each conventional source position in fine increments (submillimeter). This design can be implemented by rapidly pulsing the source during a continuous sweep of the x-ray tube. It is shown that it is not possible to eliminate the anisotropies in a conventional DBT system with uniformly-spaced source positions, even if the increments of spacing are narrower than those used clinically. However, super-resolution can be achieved everywhere if the source positions are re-arranged in clusters with submillimeter spacing. Our previous work investigated a different approach for optimizing super-resolution through the use of detector motion perpendicular to the breast support. The advantage of introducing rapid source pulsing is that detector motion is no longer required; this mitigates the need for a thick detector housing, which may be cumbersome for patient positioning.

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Raymond J. Acciavatti, Trevor L. Vent, Bruno Barufaldi, E. Paul Wileyto, Peter B. Noël, and Andrew D. A. Maidment "Proposing rapid source pulsing for improved super-resolution in digital breast tomosynthesis", Proc. SPIE 11312, Medical Imaging 2020: Physics of Medical Imaging, 113125G (16 March 2020); https://doi.org/10.1117/12.2542551

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KEYWORDS

Super resolution

Digital breast tomosynthesis

Anisotropy

Fourier transforms

Breast

X-rays

Image quality

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