Three-dimensional computer-assisted craniometrics: A comparison of the uncertainty in measurement induced by surface reconstruction performed by two computer programs

Guyomarc’h, Pierre; Santos, Frédéric; Dutailly, Bruno; Desbarats, Pascal; Bou, Christophe; Coqueugniot, Hélène

doi:10.1016/j.forsciint.2012.01.008

Cited by 48 publications

(55 citation statements)

References 37 publications

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“…Measurement error, both because of uncertainty in landmark identification/location and alterations in the objects true dimension as a consequence of imaging, has the potential to drastically affect the interpretation of results, thus this error should be considered in research design [20,21]. Furthermore, the Daubert guidelines emphasize the importance of precision, accuracy and reliability in forensic science research [20,[22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Accuracy and reliability of measurements obtained from computed tomography 3D volume rendered images

Stull

Tise

Ali

et al. 2014

Forensic Science International

147

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Forensic pathologists commonly use computed tomography (CT) images to assist in determining the cause and manner of death as well as for mass disaster operations.Even though the design of the CT machine does not inherently produce distortion, most techniques within anthropology rely on metric variables, thus concern exists regarding the accuracy of CT images reflecting an object's true dimensions. Numerous researchers have attempted to validate the use of CT images, however the comparisons have only been conducted on limited elements and/or comparisons were between measurements taken from a dry element and measurements taken from the 3D-CT image of the same dry element.A full-body CT scan was performed prior to autopsy at the Office of the Chief Medical Examiner for the State of Maryland. Following autopsy, the remains were processed to remove all soft tissues and the skeletal elements were subject to an additional CT scan. Percent differences and Bland-Altman plots were used to assess the accuracy between osteometric variables obtained from the dry skeletal elements and from CT images with and without soft tissues. An additional seven crania were scanned, measured by three observers, and the reliability was evaluated by technical error of measurement (TEM) and relative technical error of measurement (%TEM).Average percent differences between the measurements obtained from the three data sources ranged from 1.4% to 2.9%. Bland-Altman plots illustrated the two sets of measurements were generally within 2mm for each comparison between data sources. Intra-observer TEM and %TEM for three observers and all craniometric variables ranged between 0.46 mm and 0.77 mm and 0.56% and 1.06%, respectively. The three-way interobserver TEM and %TEM for craniometric variables was 2.6 mm and 2.26%, respectively. Variables that yielded high error rates were orbital height, orbital breadth, inter-orbital breadth and parietal chord. Overall, minimal differences were found among the data sources and high accuracy was noted between the observers, which prove CT images are an acceptable source to collect osteometric variables.

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Section: Introductionmentioning

confidence: 99%

“…Furthermore, the Daubert guidelines emphasize the importance of precision, accuracy and reliability in forensic science research [20,[22][23][24]. Two broad categories are associated with measurement error.…”

Section: Introductionmentioning

confidence: 99%

Accuracy and reliability of measurements obtained from computed tomography 3D volume rendered images

Stull

Tise

Ali

et al. 2014

Forensic Science International

147

View full text Add to dashboard Cite

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“…For instance, studies have shown that there are no significant differences between measurements taken from 3D virtual models generated from CT data in comparison with those generated through traditional osteometrics (Covino et al 1996;Hildebolt et al 1990;Spoor et al 1993). However, others have shown a mean difference of 0.49 mm (Choi et al 2002) and indicated that 3D CT models may lead to systematic underestimations of between 0.06 and 1.01 mm (Guyomarc'h et al 2012).…”

Section: Scientific Validitymentioning

confidence: 98%

“…Surface-scanning and 3D photogrammetry require some learning time as well as practise developing an appropriate approach to capture the complete morphology of the object of interest. Both also require processing of resulting images to create the final digital object, although this varies between methods and is being reduced by the development of semiand fully-automated programs in some cases (Guyomarc'h et al 2012;Jaklič et al 2015). CT scanning, on the other hand, can require a considerable time-commitment, access to an appropriate CT (or micro-CT) scanner which is large enough to fit the research specimen, transport of the specimen to a suitable scanner, funds to pay for the CT scanning and processing time if a researcher has to visit an external facility, as well as either access to a technician or appropriate operation knowledge, and a computer with the correct software and capacity to generate the CT data.…”

Section: Efficacymentioning

confidence: 99%

“…Some initial errors that can be encountered are a direct result of the equipment and scan parameters used to produce a digital image. For laser scanning, the quality of the resulting model is affected by the settings used (eg how many scans, point density, and mode) (Polo and Felicísimo 2012), as well as the positioning of the object (Fourie et al 2011), the environmental conditions (Algee-Hewitt and Wheat 2016), and the method used to align individual scans (Fourie et al 2011;Guyomarc'h et al 2012). In 3D photogrammetry, the camera must be calibrated prior to image capture to eliminate distortion, and the final quality of the 3D model is affected by the quantity of images captured (Gallo et al 2014).…”

Section: Scientific Validitymentioning

confidence: 99%

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The Suitability of 3D Data: 3D Digitisation of Human Remains

White

Hirst

Smith

2018

Arch

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________________________________________________________________The use of 3D data in the analysis of skeletal and fossil materials has conveyed numerous advantages in many fields; however, as the availability and use of 3D scanning equipment are rapidly increasing, it is important for researchers to consider whether these methods are suitable for the proposed study. The issue of suitability has been largely overlooked in previous research; for instance, casts and reconstruction methods are frequently used to increase sample sizes, without sufficient assessment of the effect, this may have on the accuracy and reliability of results. Furthermore, the reliability of geometric morphometric methods and the implications of virtual curation have not received sufficient consideration. This paper discusses the suitability of 3D research with regard to the accuracy, reliability, and accessibility of methods and materials, as well as the effects of the current learning environment. Areas where future work will progress 3D research are proposed. ________________________________________________________________Résumé: L'utilisation de données 3D dans l'analyse de matériaux squelettiques et fossiles a fourni de nombreux avantages dans plusieurs domaines, mais comme la disponibilité et l'utilisation de l'équipement de balayage 3D connaissent une montée rapide, les chercheurs doivent se demander si ces méthodes conviennent à l'étude proposée. Le problème de la convenance a été largement ignoré dans les recherches précédentes. Pour cas, des méthodes de moulage et de reconstruction sont souvent utilisées pour augmenter la taille des échantillons sans d'abord évaluer avec précision l'effet de celles-ci sur l'exactitude et la fiabilité des résultats. Qui plus est, la fiabilité des méthodes morphométriques géométriques et les répercussions de la conservation virtuelle n'ont pas fait l'objet de suffisamment d'attention. Le présent article discute de la convenance des recherches 3D relativement à l'exactitude, la fiabilité et l'accessibilité des méthodes et matériaux, ainsi que des effets de l'environnement d'apprentissage actuel. Nous y proposons des domaines où les travaux futurs feront avancer la recherche 3D. ________________________________________________________________Resumen: El uso de datos tridimensionales en el análisis de material esqueléticos y fó siles ha proporcionado numerosas ventajas en muchos campos, sin embargo, dado que la disponibilidad y el uso de equipos de escaneo en 3D está aumentando rápidamente, es importante que los investigadores consideren si estos métodos son adecuados para el estudio propuesto. En gran parte el tema de la idoneidad ha sido pasado por alto en investigaciones previas; por ejemplo, con frecuencia se utilizan moldes y métodos de reconstrucció n para aumentar el tamañ o de las muestras, sin una evaluació n suficiente del efecto que esto puede tener en la precisió n y confiabilidad de los resultados. Además, la confiabilidad de los métodos morfométricos geométricos y las implicacio...

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Landmark Typology in Applied Morphometrics Studies: What's the Point?

Wärmländer

Garvin

Guyomarc’h

et al. 2018

The Anatomical Record

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Landmarks are the hallmark of biological shape analysis as discrete anatomical points of correspondence. Various systems have been developed for their classification. In the most widely used system, developed by Bookstein in the 1990s, landmarks are divided into three distinct types based on their anatomical locations and biological significance. As Bookstein and others have argued that different landmark types possess different qualities, e.g., that Type 3 landmarks contain deficient information about shape variation and are less reliably measured, researchers began using landmark types as justification for selecting or avoiding particular landmarks for measurement or analysis. Here, we demonstrate considerable variation in landmark classifications among 17 studies using geometric morphometrics (GM), due to disagreement in the application of both Bookstein's landmark typology and individual landmark definitions. A review of the literature furthermore shows little correlation between landmark type and measurement reproducibility, especially when factors such as differences in measurement tools (calipers, digitizer, or computer software) and data sources (dry crania, 3D models, or 2D images) are considered. Although landmark typology is valuable when teaching biological shape analysis, we find that employing it in research design introduces confusion without providing useful information. Instead, researchers should choose landmark configurations based on their ability to test specific research hypotheses, and research papers should include justifications of landmark choices along with landmark definitions, details on landmark collection methods, and appropriate interobserver and intraobserver analyses. Hence, while the landmarks themselves are crucial for GM, we argue that their typology is of little use in applied studies. Anat Rec, 302:1144–1153, 2019. © 2018 Wiley Periodicals, Inc.

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Three-dimensional computer-assisted craniometrics: A comparison of the uncertainty in measurement induced by surface reconstruction performed by two computer programs

Cited by 48 publications

References 37 publications

Accuracy and reliability of measurements obtained from computed tomography 3D volume rendered images

Accuracy and reliability of measurements obtained from computed tomography 3D volume rendered images

The Suitability of 3D Data: 3D Digitisation of Human Remains

Landmark Typology in Applied Morphometrics Studies: What's the Point?

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