Sex differences of human corpus callosum revealed by polar coordinate system: magnetic resonance imaging study

Spasojević, Goran; Malobabić, Slobodan; Mikić, D.; Vujnović, Saša; Spasojević, O. Pilipović; Maliković, Aleksandar

doi:10.5603/fm.2015.0101

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…Generally, controversies related to tractography results can be related to the gyral and sulcal pattern of brain, in this case of the frontal lobe. The very complex and variable structure and the sex differences in the hemispheric white matter, for example such as the corpus callosum [37,38,39], requires careful explanation of results of white matter studies.…”

Section: The Frontal Longitudinal Systemmentioning

confidence: 99%

Contribution of tractography to neuroanatomical terminology - short association tracts of the frontal lobe

Malobabić,

Spasojević

2024

Biomedicinska istraž.

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<p style="text-align: justify;">Enormous development of neuroimaging technologies, and subsequently of research methods, opened new era of in vivo research of the white matter anatomy. This review analyzes recent connectomics and imaging data about short association fibers of the frontal lobe, and relates it to current status and to further development of anatomical terminology. In some recent terminologies, such as in Neuroanatomical Terminology, or in Terminology of German Anatomical Society, under the section Fibrae associationis lobares Fasciculus frontalis obliquus, Fasciculus frontalis orbitopolaris and Fasciculus frontomarginalis have been listed. Also, in this review anatomy of the potential candidates for adding into new terminologies is described, such as Fronto-parietal U-tracts, Fronto-insular tracts, and Frontal longitudinal fasciculus system. Suggestions considered in this review are related to our research of human brain morphology in order to overcome the lack of postmortem brain specimens, to contribute to the linking of different data, and to enable better morphological correlations. &nbsp;</p>

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Section: The Frontal Longitudinal Systemmentioning

confidence: 99%

Contribution of tractography to neuroanatomical terminology - short association tracts of the frontal lobe

Malobabić,

Spasojević

2024

Biomedicinska istraž.

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“…The representation of linear random variables via polar coordinates (radius and angle) is not new in statistical analysis. Some applications can be found in imaging, 21 genetics 22 and sports science, 23 to mention a few. What makes the use of polar coordinates worth some introductory remarks is the presence of a circular data component (ie, the angle).…”

Section: Introductionmentioning

confidence: 99%

Joint regression modelling of intensity and timing of accelerometer counts

Geraci

2022

Statistics in Medicine

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Accelerometers are commonly used in human medical and public health research to measure physical movement, which is relevant in a wide range of studies, from physical activity and sleep behaviours studies, to identification of movement patterns in people affected by diseases of the locomotor system and prediction of risk of injury in high performance sports. The accelerometer output provides the intensity (activity count) and timing (timestamp) of the movement, which can be used to define bouts of activity (periods of sustained movement of a given intensity). In some contexts, it may be important to include both dimensions to obtain a broader and deeper understanding of the phenomenon under study. Such is the case of a large‐scale epidemiological investigation on the daily and weekly physical activity behaviours of school‐aged children enrolled in the UK Millennium Cohort Study, which has motivated the present article. I present a statistical approach to joint modelling of intensity and timing of activity bouts that takes advantage of the circular nature of the timing. The model, which accounts for the longitudinal structure of the observations, is remarkably simple to implement using standard statistical software.

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“…), and interpretability (does this output reflect the shapes seen in the raw data?). Although there was growing interest and an increasing number of examples of Fourier shape analysis being applied in neuroimaging research and clinical outcomes (e.g., [32,36,37], publications using this technique have slowed, and there remains a lack of field-relevant benchmarking of the method. The aim of this paper is therefore to establish the properties of Fourier shape analysis techniques with a specific focus on properties relevant to neuroimaging and health analyses, using the corpus callosum for demonstration.…”

Section: Introductionmentioning

confidence: 99%

Assumption-Free Assessment of Corpus Callosum Shape: Benchmarking and Application

Walsh

Shaw

Oyarce

et al. 2019

Concepts in Magnetic Resonance Part A

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Shape analysis provides a unique insight into biological processes. This paper evaluates the properties, performance, and utility of elliptical Fourier (eFourier) analysis to operationalise global shape, focussing on the human corpus callosum. 8000 simulated corpus callosum contours were generated, systematically varying in terms of global shape (midbody arch, splenium size), local complexity (surface smoothness), and nonshape characteristics (e.g., rotation). 2088 real corpus callosum contours were manually traced from the PATH study. Performance of eFourier was benchmarked in terms of its capacity to capture and then reconstruct shape and systematically operationalise that shape via principal components analysis. We also compared the predictive performance of corpus callosum volume, position in Procrustes-aligned Landmark tangent space, and position in eFourier n-dimensional shape space in relation to the Symbol Digit Modalities Test. Jaccard index for original vs. reconstructed from eFourier shapes was excellent (M=0.98). The combination of eFourier and PCA performed particularly well in reconstructing known n-dimensional shape space but was disrupted by the inclusion of local shape manipulations. For the case study, volume, eFourier, and landmark measures were all correlated. Mixed effect model results indicated all methods detected similar features, but eFourier estimates were most predictive, and of the two shape operationalization techniques had the least error and better model fit. Elliptical Fourier analysis, particularly in combination with principal component analysis, is a powerful, assumption-free and intuitive method of quantifying global shape of the corpus callosum and shows great promise for shape analysis in neuroimaging more broadly.

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Sex differences of human corpus callosum revealed by polar coordinate system: magnetic resonance imaging study

Abstract: Background: Evaluation of morphological and size changes related to various patho- (Folia Morphol 2015; 74, 4: 414-420)

Cited by 6 publications

References 19 publications

Contribution of tractography to neuroanatomical terminology - short association tracts of the frontal lobe

Contribution of tractography to neuroanatomical terminology - short association tracts of the frontal lobe

Joint regression modelling of intensity and timing of accelerometer counts

Assumption-Free Assessment of Corpus Callosum Shape: Benchmarking and Application

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