Jimena Barbeito-Andrés1, Marisol Anzelmo1, Fernando Ventrice2, Marina L Sardi1. 1. División Antropología, Museo de La Plata, Paseo del Bosque s/n, La Plata 1900, Buenos Aires, Argentina ; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina. 2. Laboratorio de Neuroimágenes, Departamento de Imágenes, Instituto de Investigaciones Neurológicas Raúl Carrea, FLENI, Argentina.
Abstract
BACKGROUND/AIM: Computed Tomography (CT) is a powerful tool in craniofacial research that focuses on morphological variation. In this field, an ontogenetic approach has been taken to study the developmental sources of variation and to understand the basis of morphological evolution. This work aimed to determine measurement error (ME) in cranial CT in diverse developmental stages and to characterize how this error relates to different types of landmarks. MATERIAL AND METHODS: We used a sample of fifteen skulls ranging from 0 to 31 years. Two observers placed landmarks in each image three times. Measurement error was assessed before and after Generalized Procrustes Analysis. RESULTS: The results indicated that ME is larger in neurocranial structures, which are described mainly by type III landmarks and semilandmarks. In addition, adult and infant specimens showed the same level of ME. These results are specially relevant in the context of craniofacial growth research. CONCLUSION: CT images have become a frequent evidence to study cranial variation. Evaluation of ME gives insight into the potential source of error in interpreting results. Neural structures present higher ME which is mainly associated to landmark localization. However, this error is irrespective of age. If landmarks are correctly selected, they can be analyzed with the same level of reliability in adults and subadults.
BACKGROUND/AIM: Computed Tomography (CT) is a powerful tool in craniofacial research that focuses on morphological variation. In this field, an ontogenetic approach has been taken to study the developmental sources of variation and to understand the basis of morphological evolution. This work aimed to determine measurement error (ME) in cranial CT in diverse developmental stages and to characterize how this error relates to different types of landmarks. MATERIAL AND METHODS: We used a sample of fifteen skulls ranging from 0 to 31 years. Two observers placed landmarks in each image three times. Measurement error was assessed before and after Generalized Procrustes Analysis. RESULTS: The results indicated that ME is larger in neurocranial structures, which are described mainly by type III landmarks and semilandmarks. In addition, adult and infant specimens showed the same level of ME. These results are specially relevant in the context of craniofacial growth research. CONCLUSION: CT images have become a frequent evidence to study cranial variation. Evaluation of ME gives insight into the potential source of error in interpreting results. Neural structures present higher ME which is mainly associated to landmark localization. However, this error is irrespective of age. If landmarks are correctly selected, they can be analyzed with the same level of reliability in adults and subadults.
Authors: Karolin Engelkes; Jennice Helfsgott; Jörg U Hammel; Sebastian Büsse; Thomas Kleinteich; André Beerlink; Stanislav N Gorb; Alexander Haas Journal: J Anat Date: 2019-05-07 Impact factor: 2.610
Authors: Jens Fagertun; Stine Harder; Anders Rosengren; Christian Moeller; Thomas Werge; Rasmus R Paulsen; Thomas F Hansen Journal: BMC Med Imaging Date: 2014-10-11 Impact factor: 1.930