Statistical shape analysis of the anatomical variability of the human hippocampus in large populations.

Claire Cury 1, 2
2 ARAMIS - Algorithms, models and methods for images and signals of the human brain
UPMC - Université Pierre et Marie Curie - Paris 6, ICM - Institut du Cerveau et de la Moëlle Epinière = Brain and Spine Institute, Inria de Paris
Abstract : Statistical shape analysis of anatomical structures is a key challenge for many applications: modeling of the normal and pathological variability, prediction of clinical or biological parameters from anatomical data... Recent years have seen the emergence of large databases in neuro-imaging, potentially increasing the statistical power of new studies. This thesis is about the statistical analysis of the anatomical variability of hippocampi in large populations. After a state of the art, the first part of the thesis focuses on the study of an anatomical variant named Incomplete Hippocampal Inversion (IHI). We developed a new robust scale for IHI assessments. We then applied the evaluation to 2000 young healthy subjects from the European database IMAGEN. Results show that IHI are frequent on healthy population, with a left side predominance. This is the first time that IHI are studied on a large database composed of healthy subjects. The second part of this thesis develops a method for the statistical analysis of shapes based on Large Diffeomorphic Deformations Metric Mapping and mathematical currents, applicable for the analysis of large datasets. In particular we have introduced a new fast approach for the estimation of anatomical templates. This approach has been validated on 1000 young healthy subjects of the IMAGEN database and on 294 subjects from the ADNI database (healthy aging subjects and patients with Alzheimer disease). Results show that the method allows the modeling of the anatomical variability of hippocampi with a reasonable number of dimensions.
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Claire Cury. Statistical shape analysis of the anatomical variability of the human hippocampus in large populations.. Neurons and Cognition [q-bio.NC]. Université Pierre et Marie Curie - Paris VI, 2015. English. ⟨NNT : 2015PA066021⟩. ⟨tel-01133165⟩

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