The effect of lag on image quality for a digital breast tomosynthesis system

James G. Mainprize; Xinying Wang; Martin J. Yaffe

doi:10.1117/12.811889

13 March 2009 The effect of lag on image quality for a digital breast tomosynthesis system

James G. Mainprize, Xinying Wang, Martin J. Yaffe

Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 72580R (2009) https://doi.org/10.1117/12.811889
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

Digital breast tomosynthesis (DBT) is a limited-view, limited-angle computed tomography (CT) technique that has the potential to yield improved lesion conspicuity over that of standard digital mammography. To maintain short acquisition time, the detector must have a rapid temporal response. Transient effects like lag and ghosting have been noted previously in digital mammography systems, but for the times between successive views (approx. 1 minute), their impact on image quality is generally negligible. However, tomosynthesis imaging requires much shorter times between projection images (< 1 s). Under these conditions, detectors that may have been acceptable for digital mammography may not be suitable for tomosynthesis. Transient effects will generally cause both a loss of signal and an increase in image noise. A cascaded systems analysis is used to determine the effect of lag on image quality in a DBT system. It is shown that in the projection images, lag results in artifacts appearing as a "trail" of prior exposures. The effect of lag on image quality is also evaluated with a simple Monte Carlo simulation of a cone-beam tomosynthesis image formation incorporating a filtered back-projection algorithm.

Citation Download Citation

James G. Mainprize, Xinying Wang, and Martin J. Yaffe "The effect of lag on image quality for a digital breast tomosynthesis system", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72580R (13 March 2009); https://doi.org/10.1117/12.811889

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