
Proceedings Paper
Optimization of continuous tube motion and step-and-shoot motion in digital breast tomosynthesis systems with patient motionFormat | Member Price | Non-Member Price |
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Paper Abstract
In digital breast tomosynthesis (DBT), a reconstruction of the breast is generated from projections acquired over a
limited range of x-ray tube angles. There are two principal schemes for acquiring projections, continuous tube motion
and step-and-shoot motion. Although continuous tube motion has the benefit of reducing patient motion by lowering
scan time, it has the drawback of introducing blurring artifacts due to focal spot motion. The purpose of this work is to
determine the optimal scan time which minimizes this trade-off. To this end, the filtered backprojection reconstruction
of a sinusoidal input is calculated. At various frequencies, the optimal scan time is determined by the value which
maximizes the modulation of the reconstruction. Although prior authors have studied the dependency of the modulation
on focal spot motion, this work is unique in also modeling patient motion. It is shown that because continuous tube
motion and patient motion have competing influences on whether scan time should be long or short, the modulation is
maximized by an intermediate scan time. This optimal scan time decreases with object velocity and increases with
exposure time. To optimize step-and-shoot motion, we calculate the scan time for which the modulation attains the
maximum value achievable in a comparable system with continuous tube motion. This scan time provides a threshold
below which the benefits of step-and-shoot motion are justified. In conclusion, this work optimizes scan time in DBT
systems with patient motion and either continuous tube motion or step-and-shoot motion by maximizing the modulation
of the reconstruction.
Paper Details
Date Published: 2 March 2012
PDF: 12 pages
Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 831306 (2 March 2012); doi: 10.1117/12.911016
Published in SPIE Proceedings Vol. 8313:
Medical Imaging 2012: Physics of Medical Imaging
Norbert J. Pelc; Robert M. Nishikawa; Bruce R. Whiting, Editor(s)
PDF: 12 pages
Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 831306 (2 March 2012); doi: 10.1117/12.911016
Show Author Affiliations
Raymond J. Acciavatti, The Univ. of Pennsylvania (United States)
Andrew D. A. Maidment, The Univ. of Pennsylvania (United States)
Published in SPIE Proceedings Vol. 8313:
Medical Imaging 2012: Physics of Medical Imaging
Norbert J. Pelc; Robert M. Nishikawa; Bruce R. Whiting, Editor(s)
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