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Proceedings Paper

Investigation of the effect of varying scatter-to-primary ratios on nodule contrast in chest tomosynthesis
Author(s): Angelica Svalkvist; Gustaf Ullman; Markus Håkansson; David R. Dance; Michael Sandborg; Gudrun Alm Carlsson; Magnus Båth
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Paper Abstract

The primary aim of the present work was to analyze the effects of varying scatter-to-primary ratios on the appearance of simulated nodules in chest tomosynthesis section images. Monte Carlo simulations of the chest tomosynthesis system GE Definium 8000 VolumeRAD (GE Healthcare, Chalfont St. Giles, UK) were used to investigate the variation of scatter-to-primary ratios between different angular projections. The simulations were based on a voxel phantom created from CT images of an anthropomorphic chest phantom. An artificial nodule was inserted at 80 different positions in the simulated phantom images, using five different approaches for the scatter-to-primary ratios in the insertion process. One approach included individual determination of the scatter-to primary-ratio for each projection image and nodule location, while the other four approaches were using mean value, median value and zero degree projection value of the scatter-toprimary ratios at each nodule position as well as using a constant scatter-to-primary ratio of 0.5 for all nodule positions. The results indicate that the scatter-to-primary ratios vary up to a factor of 10 between the different angular tomosynthesis projections (±15°). However, the error in the resulting nodule contrast introduced by not taking all variations into account is in general smaller than 10 %.

Paper Details

Date Published: 16 March 2011
PDF: 10 pages
Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 79615Y (16 March 2011); doi: 10.1117/12.873173
Show Author Affiliations
Angelica Svalkvist, Univ. of Gothenburg (Sweden)
Gustaf Ullman, Linköping Univ. (Sweden)
Uppsala Univ. (Sweden)
Markus Håkansson, Univ. of Gothenburg (Sweden)
Sahlgrenska Univ. Hospital (Sweden)
David R. Dance, Royal Surrey County Hospital (United Kingdom)
Michael Sandborg, Linköping Univ. (Sweden)
Gudrun Alm Carlsson, Linköping Univ. (Sweden)
Magnus Båth, Univ. of Gothenburg (Sweden)
Sahlgrenska Univ. Hospital (Sweden)

Published in SPIE Proceedings Vol. 7961:
Medical Imaging 2011: Physics of Medical Imaging
Norbert J. Pelc; Ehsan Samei; Robert M. Nishikawa, Editor(s)

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