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Proceedings Paper

Quantification of resolution in multiplanar reconstructions for digital breast tomosynthesis
Author(s): Trevor L. Vent; Raymond J. Acciavatti; Young Joon Kwon; Andrew D. A. Maidment
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Paper Abstract

Multiplanar reconstruction (MPR) in digital breast tomosynthesis (DBT) allows tomographic images to be portrayed in various orientations. We have conducted research to determine the resolution of tomosynthesis MPR. We built a phantom that houses a star test pattern to measure resolution. This phantom provides three rotational degrees of freedom. The design consists of two hemispheres with longitudinal and latitudinal grooves that reference angular increments. When joined together, the hemispheres form a dome that sits inside a cylindrical encasement. The cylindrical encasement contains reference notches to match the longitudinal and latitudinal grooves that guide the phantom’s rotations. With this design, any orientation of the star-pattern can be analyzed. Images of the star-pattern were acquired using a DBT mammography system at the Hospital of the University of Pennsylvania. Images taken were reconstructed and analyzed by two different methods. First, the maximum visible frequency (in line pairs per millimeter) of the star test pattern was measured. Then, the contrast was calculated at a fixed spatial frequency. These analyses confirm that resolution decreases with tilt relative to the breast support. They also confirm that resolution in tomosynthesis MPR is dependent on object orientation. Current results verify that the existence of super-resolution depends on the orientation of the frequency; the direction parallel to x-ray tube motion shows super-resolution. In conclusion, this study demonstrates that the direction of the spatial frequency relative to the motion of the x-ray tube is a determinant of resolution in MPR for DBT.

Paper Details

Date Published: 22 March 2016
PDF: 12 pages
Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 978303 (22 March 2016);
Show Author Affiliations
Trevor L. Vent, Univ. of Pennsylvania Health System (United States)
Raymond J. Acciavatti, Univ. of Pennsylvania Health System (United States)
Young Joon Kwon, Univ. of Pennsylvania Health System (United States)
Andrew D. A. Maidment, Univ. of Pennsylvania Health System (United States)

Published in SPIE Proceedings Vol. 9783:
Medical Imaging 2016: Physics of Medical Imaging
Despina Kontos; Thomas G. Flohr, Editor(s)

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