Accuracy of Three-Dimensional Photogrammetric Images in Non-Synostotic Cranial Deformities

Schaaf, Helmut; Pons-Kuehnemann, Joern; Malik, Christoph Yves; Streckbein, Philipp; Preuss, Markus; Howaldt, Hans‐Peter; Wilbrand, Jan-Falco

doi:10.1055/s-0030-1255060

Cited by 67 publications

(49 citation statements)

References 33 publications

(34 reference statements)

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“…Agreement between measurements was above 0.9 in all measurements based on ICC results. These findings are consistent with the studies by Aldridge et al, 19 Wong et al, 9 and Schaaf et al 26 According to Heike et al, 27 the intrarater reliability correlation coefficients for the 3D stereophotogrammetric images were greater than or equal to 0.95 for 26 of the 30 measurements and mean absolute differences were ,1 mm.…”

Section: Discussionsupporting

confidence: 91%

Accuracy and reliability of 3D stereophotogrammetry: A comparison to direct anthropometry and 2D photogrammetry

Di̇ndaroğlu

Kutlu

Duran

et al. 2016

The Angle Orthodontist

136

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Objective: To evaluate the accuracy of three-dimensional (3D) stereophotogrammetry by comparing it with the direct anthropometry and digital photogrammetry methods. The reliability of 3D stereophotogrammetry was also examined. Materials and Methods: Six profile and four frontal parameters were directly measured on the faces of 80 participants. The same measurements were repeated using two-dimensional (2D) photogrammetry and 3D stereophotogrammetry (3dMDflex System, 3dMD, Atlanta, Ga) to obtain images of the subjects. Another observer made the same measurements for images obtained with 3D stereophotogrammetry, and interobserver reproducibility was evaluated for 3D images. Both observers remeasured the 3D images 1 month later, and intraobserver reproducibility was evaluated. Statistical analysis was conducted using the paired samples t-test, intraclass correlation coefficient, and Bland-Altman limits of agreement. Results: The highest mean difference was 0.30 mm between direct measurement and photogrammetry, 0.21 mm between direct measurement and 3D stereophotogrammetry, and 0.5 mm between photogrammetry and 3D stereophotogrammetry. The lowest agreement value was 0.965 in the Sn-Prn parameter between the photogrammetry and 3D stereophotogrammetry methods. Agreement between the two observers varied from 0.90 (Ch-Ch) to 0.99 (Sn-Me) in linear measurements. For intraobserver agreement, the highest difference between means was 0.33 for observer 1 and 1.42 mm for observer 2. Conclusions: Measurements obtained using 3D stereophotogrammetry indicate that it may be an accurate and reliable imaging method for use in orthodontics. (Angle Orthod. 2016;86:487-494.)

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Section: Discussionsupporting

confidence: 91%

Accuracy and reliability of 3D stereophotogrammetry: A comparison to direct anthropometry and 2D photogrammetry

Di̇ndaroğlu

Kutlu

Duran

et al. 2016

The Angle Orthodontist

136

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“…In most cases, the effects of the deformational plagiocephaly are aesthetical and can be corrected by active repositioning or the use of orthotic helmets (Schaaf et al 2010). In contrast, craniosynostosis, which can cause major problems such as elevated intracranial pressure, usually requires surgical intervention for its correction.…”

Section: Introductionmentioning

confidence: 99%

“…3D modelling is considered an interesting option as it is accurate and non-invasive. The main problem of the method is the acquisition of well-focused images in real clinical conditions, as the infants are usually in constant movement during the medical consultation (Schaaf et al 2010). To deal with this issue complex setups of professional cameras or combinations of camera and laser are used.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Repeatability on Videogrammetry for Infants’ Cranial Deformation

García¹,

Lerma²,

Mateu³

et al. 2017

Proceedings - 1st Congress in Geomatics Engineering - CIGeo

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Abstract:Cranial deformation affects a large number of infants. The methodologies commonly employed to measure the deformation include, among others, calliper measurements and visual assessment for mild cases and radiological imaging for severe cases, where surgical intervention is considered. Visual assessment and calliper measurements usually lack the required level of accuracy to evaluate the deformation. Radiological imaging, including Computed Tomography (CT) and Magnetic Resonance Imaging (MRI), are costly and highly invasive. The use of smartphones to record videos that can be used for three-dimensional (3D) modelling of the head has emerged as a low-cost, noninvasive methodology to extract 3D information of the patient. To be able to analyse the deformation, a novel technique is employed: the obtained model is compared with an ideal head. In this study we have tested the repeatability of the process. For this purpose, several models of two patients have been obtained and the differences between them are evaluated. The results show that the differences in the ellipsoid semiaxis for the same patient are usually below 4 mm, although they increase up to 6.4 mm in some cases. The variability in the distances to the ideal head, which are the values used to evaluate deformity, reaches a maximum value of 2.7 mm. The errors obtained are comparable to those of classical measurement techniques and show the potential of the methodology in development.Keywords: Photogrammetry, Low-cost, Plagiocephaly, 3D modelling Resumen:La deformación craneal afecta a un elevado porcentaje de lactantes, a pesar de esto, no existen estándares para su medición. Existen diversas metodologías empleadas para el análisis de este tipo de deformación, que van desde el análisis visual o la medición con calibre en casos leves, a pruebas radiológicas en casos más graves, en los que se plantea la posibilidad de una intervención quirúrgica. El análisis visual y la medición con calibre a menudo carecen de la precisión requerida para evaluar la deformación, mientras que las pruebas radiológicas (Tomografía Axial Computarizada, TAC, o Resonancia Magnética, RM) son altamente invasivas y tienen un alto coste. Otras soluciones como la fotografía tridimensional (3D) incluyen complejos sistemas de varias cámaras, lo que también supone un coste elevado. La posibilidad de utilizar videos tomados con teléfonos inteligentes para la creación de modelos 3D craneales se ha convertido en una posibilidad para obtener información 3D del paciente de forma precisa y con un coste bajo. Para analizar la deformación se ha planteado una metodología que consiste en calcular las distancias entre el modelo generado y una forma craneal ideal. En este estudio se ha llevado a cabo el análisis de la repetibilidad del proceso de obtención del modelo y de la cabeza ideal ajustada, para ello se han obtenido varios modelos 3D de dos pacientes y se han evaluado las diferencias entre ellos. Los resultados muestran unas diferencias en los semiejes de los elipsoides de aproximadamen...

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“…The analysis of three-dimensional models of stereopho togrammetry can be made by means of linear, volume, an gular, or area measurements, and/or by comparison of pattern reference points or whole faces. The more relevant the issues addressed in a model, the better the quality of the study results 7,8 . This systematic review aims to address the use of stereophotogrammetry in evaluating craniofacial deformities, focusing on its practical application.…”

Section: Introductionmentioning

confidence: 99%

Uso da estereofotogrametria nas deformidades craniofaciais: revisão sistemática

Ladeira¹,

Bastos²,

Vanini³

et al. 2013

Rev. Bras. Cir. Plást.

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Accuracy of Three-Dimensional Photogrammetric Images in Non-Synostotic Cranial Deformities

Abstract: 3D photogrammetry is potentially a reliable tool for treatment planning and follow-up of abnormal head shapes in infancy.

Cited by 67 publications

References 33 publications

Accuracy and reliability of 3D stereophotogrammetry: A comparison to direct anthropometry and 2D photogrammetry

Accuracy and reliability of 3D stereophotogrammetry: A comparison to direct anthropometry and 2D photogrammetry

Analysis of Repeatability on Videogrammetry for Infants’ Cranial Deformation

Uso da estereofotogrametria nas deformidades craniofaciais: revisão sistemática

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