Search PubMed⌕ Search
Home/Archive/PubMed

PubMed · 14992761

Structural shape characterization via exploratory factor analysis.

Alexei M C Machado·James C Gee·Mario F M Campos
View original source ↗Export metadata ↓

Abstract

UNLABELLED: This article presents an exploratory factor analytic approach to morphometry in which a high-dimensional set of shape-related variables is examined with the purpose of finding clusters with strong correlation. This clustering can potentially identify regions that have anatomic significance and thus lend insight to knowledge discovery and morphometric investigations. METHODS: The information about regional shape is extracted by registering a reference image to a set of test images. Based on the displacement fields obtained form image registration, the amount of pointwise volume enlargement or reduction is computed and statistically analyzed with the purpose of extracting a reduced set of common factors. EXPERIMENTS: The effectiveness and robustness of the method is demonstrated in a study of gender-related differences of the human corpus callosum anatomy, based on a sample of 84 right-handed normal controls. RESULTS: The method is able to automatically partition the structure into regions of interest, in which the most relevant shape differences can be observed. The confidence of results is evaluated by analyzing the statistical fit of the model and compared to previous experimental works.

Explore related subjects

AnthropometryArtificial IntelligenceCorpus CallosumFactor Analysis, StatisticalFemaleFunctional LateralityHumansMagnetic Resonance ImagingMaleSex FactorsJournal ArticleResearch Support, Non-U.S. Gov'tResearch Support, U.S. Gov't, P.H.S.Review

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Alexei M C Machado, James C Gee, Mario F M Campos. 2004. Structural shape characterization via exploratory factor analysis.. https://doi.org/10.1016/s0933-3657(03)00039-3

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2005

Triangle identified at the proximal end of femur: a new sex determinant.

Deviating from the conventional measurements, the present study uses the points of traction epiphysis on the upper end the femur as a landmark for measurement. A triangle was drawn on the posterior aspect of the femur using the apex of two traction epiphyses and the lateral most point on the articular margin of head. The study was conducted on 200 male and 80 female femora belonging to Central India. The lengths of triangle, so drawn, yielded highly significant results. The measurements were further evaluated by discriminant function analysis. Employing a single variable attained a prediction accuracy of 85.5% for males and 81.3% for females. When the variables were combined into a function, the accuracy improved to 86.5% for males and 86.3% for females. One of the advantages of the measurements on the proximal end of femur is that they can be used on fragmented bone where the shaft and distal end are missing. The study has applied value in the field of forensic anthropology.

Anthropometry↗
PubMed2005

The estimation of stature on the basis of measurements of the femur.

The study aims to establish the relationship between body height and the greatest length of the femur. The motive for undertaking these examinations was the lack in the literature of studies that allow -- with reference to the current population of Central Europe -- the reconstruction of height while alive based on measurements of a skeleton. It was decided to examine isolated bones from human remains undergoing forensic autopsy, and belonging to individuals of both sexes whose growth processes had stopped. Examinations were conducted on 91 human bodies from the contemporary Polish population. The research points to a very close relationship between the length of a dead body and the measured greatest length of the femur. This relationship was expressed in nine coefficients of correlation calculated for both sexes.

Anthropometry↗
PubMed2005

Discriminant function sexing of fragmentary and complete tibiae from medieval Croatian sites.

Previous studies have demonstrated that populations differ from each other in size and proportion and that these differences can affect metric assessment of sex. This paper establishes standards for determining sex from fragmentary and complete tibiae in the medieval Croatian population. The sample is composed of 180 tibiae (96 males and 84 females) from six medieval archaeological sites in Croatia. Three of the sites were located in continental Croatia, three on the eastern Adriatic coast and its immediate hinterland. Six tibial dimensions were measured: (1) length of the tibia; (2) maximum epiphyseal breadth of the proximal tibia; (3) maximum epiphyseal breadth of the distal tibia; (4) maximum diameter of the tibia at the nutritient foramen; (5) transverse diameter of the tibia at the nutritient foramen; and (6) circumference of the tibia at the nutritient foramen. Unifactorial and multifactorial analyses were performed on the collected data. Six discriminant functions were generated, one using six variables, two using two variables, and three employing one variable. Results show that complete tibiae can be sexed with 92.2% accuracy. Slightly lower accuracies (91.7 and 87.8%) were achieved using a combination of two variables, while functions employing one variable were accurate from 85.6 to 81.7%. The results of this study show that the medieval Croatian tibia is a good skeletal component for determining sex. Standardized coefficients of the discriminant functions generated in this study support the results of previous studies that found that breadth dimensions provide better separation of the sexes than length.

Anthropometry↗