Accuracy of Linear Craniometric Measurements Obtained from Laser Scanning Created 3D Models of Dry Skulls

Toneva, Diana; Nikolova, Silviya; Georgiev, Ivan; Tchorbadjieff, Assen

doi:10.1007/978-3-319-49544-6_18

Cited by 9 publications

(5 citation statements)

References 20 publications

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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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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 scanner accuracy reported by the manufacturer was up to 0.05 mm. The parameters established to be optimal for dry bone scanning were a scanning resolution of 0.40 mm and a texture resolution of 150 DPI (Toneva et al, 2017(Toneva et al, , 2020, and these were applied to each of the scanning sessions. The generated 3D surface images were postprocessed using the software platform VXelements.…”

Section: Methodsmentioning

confidence: 99%

Anatomic variations in the frontal and occipital bones: a comparative study of neurocranial morphology

NIKOLOVA

TONEVA

Lazarov

2023

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Developmental variations in the cranial vault arise during early ontogenesis due to premature or delayed suture closure, non-union between the normal ossification centers, and emergence of additional ossification centers. These variations cause abnormal calvarial partition and are often associated with modifications of the overall cranial configuration. This study aims to evaluate the impact of metopic suture persistence and the development of supernumerary bones in the occipital region on neurocranial morphology. A series of 245 crania of Bulgarian males was investigated. According to the presence or absence of developmental variations in the frontal and occipital bone they were divided into four series: control (n = 115); crania with a retained metopic suture (n = 32); crania with supernumerary bones in the occipital region (n = 67); and metopic crania with supernumerary bones in the occipital region (n = 31). Polygonal 3D models were generated, on which the 3D coordinates of 35 landmarks describing the neurocranium were collected. Geometric morphometric analyses were applied to compare the size and shape of the landmark configurations. Significant size differences were observed only in the frontal and occipital bone configurations between the metopic crania with occipital supernumerary bones and the non-metopic crania. Significant shape differences were found in all comparisons between the metopic and non-metopic groups for all configurations, except the occipital one. Metopism has a significant impact on overall neurocranial morphology, which is intensified by the presence of supernumerary bones in the occipital region.

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“…Some investigations were carried out for evaluating the reliability of measurements taken on the 3D digital models created by laser scanning comparing with directly taken linear measurements on dry skulls (Toneva et al, 2017), which allows assessing the good agreement between both measuring methods and applicability of laser scanning for paleoanthropological measurements.…”

Section: Related Workmentioning

confidence: 99%

Photogrammetric Techniques for Paleoanthropological Objects Preserving and Studying

Knyaz

Leybova

Galeev

et al. 2018

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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Paleo-anthropological research has its specificity closely related with studied objects. Their complicated shape arises from anatomical features of human skull and other skeletal bones. The degree of preservation is associated with the fragility of palaeo-anthropological material which usually has high historical and scientific value. The circumstances mentioned above enhance the relevance of photogrammetry implementation in anthropological studies. Thus, such combination of scientific methodologies with up-to-date technology creates a potential for improvement of various stages of palaeo-anthropological studies. This can be referred to accurate documenting of anthropological material and creation of databases accessible for wide range of users, predominantly research scientists and students; preservation of highly valuable samples and possibility of sharing information as 3D images or printed copies, improving co-operation of scientists world-wide; potential for replication of contact anthropometric studies on 3D images or printed copies providing for development of new biometric methods, and etc. This paper presents an approach based on photogrammetric techniques and non-contact measurements, providing technological and methodological development of paleo-anthropological studies, including data capturing, processing and representing.

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Accuracy of Linear Craniometric Measurements Obtained from Laser Scanning Created 3D Models of Dry Skulls

Cited by 9 publications

References 20 publications

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

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

Anatomic variations in the frontal and occipital bones: a comparative study of neurocranial morphology

Photogrammetric Techniques for Paleoanthropological Objects Preserving and Studying

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