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Investigation of the effect of varying scatter-to-primary ratios on nodule contrast in chest tomosynthesis
Dept. of Radiation Physics, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden.
Linköping University, Department of Medical and Health Sciences, Radiation Physics. Linköping University, Faculty of Health Sciences. Department of Cell and Molecular Biology, Uppsala University, Uppsala, Sweden.
Dept. of Radiation Physics, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden and Dept. of Diagnostic Radiology, Södra Älvsborgs Sjukhus, Sahlgrenska University Hospital, Gothenburg, Sweden.
NCCPM, Royal Surrey County Hospital, Guildford , UK.
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2011 (English)In: Medical Imaging 2011: Physics of Medical Imaging / [ed] Norbert J. Pelc; Ehsan Samei; Robert M. Nishikawa, SPIE - International Society for Optical Engineering, 2011, 79615Y-1-79615Y-10 p.Conference paper (Other academic)
Abstract [en]

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-to-primary 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 %.

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2011. 79615Y-1-79615Y-10 p.
Series
, Proceedings of SPIE (Progress in biomedical optics and imaging), ISSN 1605-7422 ; 7961
Keyword [en]
TSYN, XIM
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:liu:diva-68292DOI: 10.1117/12.873173ISI: 000294178500201ISBN: 9780819485038OAI: oai:DiVA.org:liu-68292DiVA: diva2:417716
Conference
Medical Imaging 2011: Physics of Medical Imaging, 12 February 20011, Lake Buena Vista, Florida, USA
Note

Original Publication: Angelica Svalkvist, Gustaf Ullman, Markus Håkansson, David Dance, Michael Sandborg, Gudrun Alm Carlsson and Magnus Båth, Investigation of the effect of varying scatter-to-primary ratios on nodule contrast in chest tomosynthesis, 2011, Proc SPIE 7961, 79615Y. http://dx.doi.org/10.1117/12.873173 Copyright 2011 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

Available from: 2011-05-18 Created: 2011-05-18 Last updated: 2015-03-20Bibliographically approved

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Ullman, GustafSandborg, MichaelAlm Carlsson, Gudrun
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