The importance of processing procedures and threshold values in CT scan segmentation of skeletal elements: An example using the immature os coxa

Forensic Science International : Synergy
Michala K StockKyra E Stull

Abstract

As the accessibility and utility of virtual databases of skeletal collections continues to grow, the impact that scan processing procedures has on the accuracy of data obtained from virtual databases remains relatively unknown. This study quantifies the intra- and inter-observer error generated from varying computed tomography (CT) scan processing protocols, including re-segmentation, incrementally varying thresholding value, and data collectors' selection of the threshold value on a set of virtual subadult pelves. Four observers segmented the subadult ossa coxarum from postmortem CT scans of the fully-fleshed bodies of eleven individuals of varying ages. Segmentation protocol was set, with the exception of each observer selecting their own thresholding value for each scan. The resulting smoothed pelvic surfaces were then compared using deviation analyses. Root mean square error (RMSE), average distance deviation, and maximum deviation distances demonstrated that thresholding values of ∼50 HU (Hounsfield units) are easily tolerated, the surfaces generated are robust to error, and threshold value selection does not systematically vary with user experience. The importance of consistent methodology during segmentation protocol is ...Continue Reading

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Citations

Nov 28, 2020·American Journal of Physical Anthropology·Kyra E StullMarin A Pilloud
Feb 6, 2021·Journal of Biomechanics·M GardegarontH Follet
Jan 19, 2021·Forensic Science International : Synergy·L K CorronK E Stull
May 19, 2021·American Journal of Physical Anthropology·An-Di YimHon-Man Liu
Jun 7, 2021·Forensic Science International : Synergy·Louise K CorronJaroslav Brůžek
Aug 7, 2021·Journal of Forensic Sciences·Heather M GarvinKyra E Stull

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