The importance of processing procedures and threshold values in CT scan segmentation of skeletal elements: An example using the immature os coxa
| Autor: | Michala K. Stock, Cortney N. Hulse, Heather M. Garvin, Kerri L. Colman, Louise Corron, Laura E Cirillo, Kyra E. Stull, Alexandra R. Klales |
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| Přispěvatelé: | ACS - Amsterdam Cardiovascular Sciences, ARD - Amsterdam Reproduction and Development, Graduate School, Medical Biology |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Male
Mean squared error Adolescent Computer science Threshold limit value Biological anthropology Forensic anthropology Geomagic® Virtual anthropology 01 natural sciences Pathology and Forensic Medicine Subadult Set (abstract data type) 03 medical and health sciences 0302 clinical medicine Imaging Three-Dimensional Consistency (statistics) Hounsfield scale Image Processing Computer-Assisted Humans Segmentation 030216 legal & forensic medicine Child Pelvic Bones Observer Variation business.industry 010401 analytical chemistry Infant Pattern recognition Precision Amira™ Thresholding 0104 chemical sciences Child Preschool Female Artificial intelligence business Tomography X-Ray Computed Law Smoothing |
| Zdroj: | Forensic science international, 309:110232. Elsevier Ireland Ltd |
| ISSN: | 0379-0738 |
| Popis: | 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 highlighted here, especially with regards to consistency in both selected thresholding value as well as smoothing protocol, as these variables can affect subsequent measurements of the resultant surfaces. |
| Databáze: | OpenAIRE |
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