Accuracy of the anthropometric measurements of skeletonized skulls with corresponding measurements of their 3D reconstructions obtained by CT scanning

Lorkiewicz-Muszyńska, Dorota; Kociemba, Wojciech; Sroka, Alicja; Kulczyk, Tomasz; Żaba, Czesław; Paprzycki, W; Przystańska, Agnieszka

doi:10.1127/anthranz/2015/0481

Cited by 20 publications

(9 citation statements)

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“…Furthermore, precise results have been established for the cranial volume and surface area based on 3D laser scanning technology [25]. The 3D volumetric representations obtained by traditional CT [23,26,27] and cone beam CT (CBCT) [28][29][30][31][32] scans have also provided accurate and reliable digital measurements. However, there have been few comparative studies including angular characteristics.…”

Section: Discussionmentioning

confidence: 99%

Reliability and Accuracy of Angular Measurements on Laser Scanning Created 3D Models of Dry Skulls

Toneva

Nikolova

Georgiev

2016

Journal of Anthropology

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The aim of the study was to assess the accuracy and reliability of skull angles measured on 3D models created by laser scanning. Five skulls were measured through both conventional and digital measuring methods. The 3D models were created using a hand-held laser scanner Creaform VIUscan™. Seven angular characteristics were measured three times by two observers. The intra- and interobserver reliability were assessed using intraclass correlation coefficient. The differences between the digital and direct measurements were assessed using the measurement and relative errors. The intraclass correlation coefficients for digitally taken angles indicated almost perfect intra- and interobserver reliability, except for the alveolar profile angle showing moderate interobserver agreement. The overall measurement error based on the differences between digitally and directly measured angles was 0.61° and the relative error was 0.68%.

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Section: Discussionmentioning

confidence: 99%

Reliability and Accuracy of Angular Measurements on Laser Scanning Created 3D Models of Dry Skulls

Toneva

Nikolova

Georgiev

2016

Journal of Anthropology

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“…For example, linear measurements obtained from CT scans of human skulls were shown to differ insignificantly from corresponding measurements on the original skulls (Lorkiewicz‐Muszyńska et al. ; but see Hildebolt et al. and Richtsmeier et al.…”

Section: Introductionmentioning

confidence: 99%

Measurement error in μCT‐based three‐dimensional geometric morphometrics introduced by surface generation and landmark data acquisition

et al. 2019

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Computed‐tomography‐derived (CT‐derived) polymesh surfaces are widely used in geometric morphometric studies. This approach is inevitably associated with decisions on scanning parameters, resolution, and segmentation strategies. Although the underlying processing steps have been shown to potentially contribute artefactual variance to three‐dimensional landmark coordinates, their effects on measurement error have rarely been assessed systematically in CT‐based geometric morphometric studies. The present study systematically assessed artefactual variance in landmark data introduced by the use of different voxel sizes, segmentation strategies, surface simplification degrees, and by inter‐ and intra‐observer differences, and compared their magnitude to true biological variation. Multiple CT‐derived surface variants of the anuran (Amphibia: Anura) pectoral girdle were generated by systematic changes in the factors that potentially influence the surface geometries. Twenty‐four landmarks were repeatedly acquired by different observers. The contribution of all factors to the total variance in the landmark data was assessed using random‐factor nested permanovas. Selected sets of Euclidean distances between landmark sets served further to compare the variance among factor levels. Landmark precision was assessed by landmark standard deviation and compared among observers and days. Results showed that all factors, except for voxel size, significantly contributed to measurement error in at least some of the analyses performed. In total, 6.75% of the variance in landmark data that mimicked a realistic biological study was caused by measurement error. In this landmark dataset, intra‐observer error was the major source of artefactual variance followed by inter‐observer error; the factor segmentation contributed < 1% and slight surface simplification had no significant effect. Inter‐observer error clearly exceeded intra‐observer error in a different landmark dataset acquired by six partly inexperienced observers. The results suggest that intra‐observer error can potentially be reduced by including a training period prior to the actual landmark acquisition task and by acquiring landmarks in as few sessions as possible. Additionally, the application of moderate and careful surface simplification and, potentially, also the use of case‐specific optimal combinations of automatic local thresholding algorithms and parameters for segmentation can help reduce intra‐observer error. If landmark data are to be acquired by several observers, it is important to ensure that all observers are consistent in landmark identification. Despite the significant amount of artefactual variance, we have shown that landmark data acquired from microCT‐derived surfaces are precise enough to study the shape of anuran pectoral girdles. Yet, a systematic assessment of measurement error is advisable for all geometric morphometric studies.

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“…Advanced imaging technologies produce twodimensional (2D) and three-dimensional (3D) images, which allow various metric analyses in virtual environment. There are numerous studies comparing the reliability and accuracy of measurements obtained by direct craniometric approaches with those measured on 3D models generated by different technologies such as laser scanning (Park et al, 2006;Richard et al, 2014;Toneva et al, 2016;Toneva et al, 2017b;Thoma et al, 2018), multi-slice computed tomography (CT, Richard et al, 2014;Stull et al, 2014;Lorkiewicz-Muszy nska et al, 2015), cone-beam CT (Berco et al, 2009;Hassan et al, 2009;Damstra et al, 2010;Kamburo glu et al, 2011), industrial CT (Toneva et al, 2017a), 3D photogrammetry (Moshobane et al, 2016), as well as on 3D printed copies (Nizam et al, 2006;Richard et al, 2014). The accuracy of digital measurements depends to a large extent on the precision in landmark placement.…”

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confidence: 99%

Impact of Resolution and Texture of Laser Scanning Generated Three‐Dimensional Models on Landmark Identification

Toneva

Nikolova

Georgiev

et al. 2019

The Anatomical Record

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The aim of the study was to determine the impact of the resolution and texture of three‐dimensional (3D) models created through laser scanning on the measurement error (ME) of craniometric landmarks. Ten skulls were scanned at five different resolutions, and the generated 3D models were exported with and without texture. The 3D coordinates of 28 landmarks were derived. Each landmark was picked five times by one observer. The ME of a definite landmark was calculated as an average of distances between the repeated placements of the landmark by the observer and the landmark centroid. One‐way analysis of variance was applied for detection of significant differences in the MEs between and within landmark types recorded at different resolutions. The MEs of landmark types in textured and nontextured models were compared by a paired test. Twelve linear measurements were calculated as interlandmark distances, and their values obtained on the models of different resolution were compared. The Frankfurt horizontal plane was constructed for each model and its deviation was calculated at different resolutions. Scan resolution impacted MEs of Type 1 and Type 2 landmarks but not the precision level of Type 3 landmarks. Texture most influenced the precise identification of Type 1 landmarks. The interlandmark distances between Type 2 landmarks were most consistent in their values, those between Type 1 landmarks showed deviations in low‐resolution models, and distances between Type 3 landmarks demonstrated various patterns of transition of the values throughout the resolutions. Altogether, the use of textured high‐resolution models would be preferable in morphometric studies. Anat Rec, 2019. © 2019 American Association for Anatomy Anat Rec, 303:1950–1965, 2020. © 2019 American Association for Anatomy

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Accuracy of the anthropometric measurements of skeletonized skulls with corresponding measurements of their 3D reconstructions obtained by CT scanning

Abstract: It is relevant that 3D reconstructions of the skull can be used in forensic anthropology for personal identification.

Cited by 20 publications

References 0 publications

Reliability and Accuracy of Angular Measurements on Laser Scanning Created 3D Models of Dry Skulls

Reliability and Accuracy of Angular Measurements on Laser Scanning Created 3D Models of Dry Skulls

Measurement error in μCT‐based three‐dimensional geometric morphometrics introduced by surface generation and landmark data acquisition

Impact of Resolution and Texture of Laser Scanning Generated Three‐Dimensional Models on Landmark Identification

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