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Proceedings Paper

Geometric calibration for a next-generation digital breast tomosynthesis system
Author(s): William S. Ferris; Trevor L. Vent; Tristan D. Maidment; Raymond J. Acciavatti; David E. Wurtele; Andrew D. A. Maidment
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Paper Abstract

A method for geometric calibration of a next-generation tomosynthesis (NGT) system is proposed and tested. The NGT system incorporates additional geometric movements between projections over conventional DBT. These movements require precise geometric calibration to support magnification DBT and isotropic SR. A phantom was created to project small tungsten-carbide ball bearings (BB’s) onto the detector at four different magnifications. Using a bandpass filter and template matching, a MATLAB program was written to identify the centroid locations of each BB projection on the images. An optimization algorithm calculated an effective location for the source and detector that mathematically projected the BB’s onto the same locations on the detector as found on the projection images. The average distance between the BB projections on the image and the mathematically computed projections was 0.11 mm. The effective locations for the source and detector were encoded in the DICOM file for each projection; these were then used by the reconstruction algorithm. Tomographic image reconstructions were performed for three acquisition modes of the NGT system; these successfully demonstrated isotropic SR, magnified SR, and oblique reconstruction.

Paper Details

Date Published: 9 March 2017
PDF: 10 pages
Proc. SPIE 10132, Medical Imaging 2017: Physics of Medical Imaging, 101324C (9 March 2017); doi: 10.1117/12.2255301
Show Author Affiliations
William S. Ferris, Univ. of Pennsylvania (United States)
Trevor L. Vent, Univ. of Pennsylvania (United States)
Tristan D. Maidment, Univ. of Pennsylvania (United States)
Raymond J. Acciavatti, Univ. of Pennsylvania (United States)
David E. Wurtele, Swarthmore College (United States)
Andrew D. A. Maidment, Univ. of Pennsylvania (United States)

Published in SPIE Proceedings Vol. 10132:
Medical Imaging 2017: Physics of Medical Imaging
Thomas G. Flohr; Joseph Y. Lo; Taly Gilat Schmidt, Editor(s)

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