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669 results on '"Ayache, N."'

1. Regional flux analysis for discovering and quantifying anatomical changes: An application to the brain morphometry in Alzheimer's disease

Author

Lorenzi, M, Ayache, N, Pennec, X, and Initiative, for the Alzheimer's Disease Neuroimaging

Subjects
Biomedical and Clinical Sciences, Health Sciences, Acquired Cognitive Impairment, Neurosciences, Brain Disorders, Neurodegenerative, Alzheimer's Disease, Alzheimer's Disease including Alzheimer's Disease Related Dementias (AD/ADRD), Dementia, Aging, Neurological, Algorithms, Alzheimer Disease, Anatomy, Cross-Sectional, Atrophy, Brain, Cerebral Ventricles, Databases, Factual, Disease Progression, Hippocampus, Humans, Image Processing, Computer-Assisted, Non-linear registration, Longitudinal atrophy, Alzheimer's disease, Optimization, Demons, Alzheimer's Disease Neuroimaging Initiative, Medical and Health Sciences, Psychology and Cognitive Sciences, Neurology & Neurosurgery, Biomedical and clinical sciences, Health sciences
Abstract

In this study we introduce the regional flux analysis, a novel approach to deformation based morphometry based on the Helmholtz decomposition of deformations parameterized by stationary velocity fields. We use the scalar pressure map associated to the irrotational component of the deformation to discover the critical regions of volume change. These regions are used to consistently quantify the associated measure of volume change by the probabilistic integration of the flux of the longitudinal deformations across the boundaries. The presented framework unifies voxel-based and regional approaches, and robustly describes the volume changes at both group-wise and subject-specific level as a spatial process governed by consistently defined regions. Our experiments on the large cohorts of the ADNI dataset show that the regional flux analysis is a powerful and flexible instrument for the study of Alzheimer's disease in a wide range of scenarios: cross-sectional deformation based morphometry, longitudinal discovery and quantification of group-wise volume changes, and statistically powered and robust quantification of hippocampal and ventricular atrophy.

Published
2015

2. SELF-ORGANIZING MAPS APPLIED TO DECLUSTERING IN PREFERENTIAL SAMPLING.

Author

AYACHE, N. K., SANTOS, A. E. M., NASCIMENTO, A. E. A., DE CASTRO, S. A. B., and DA SILVA, D. F. S.

Subjects
*SELF-organizing maps
Abstract

Sampling processes in mineral exploration often result in preferentially sampled areas, with the formation of clustering. Some factors can cause areas to be preferentially sampled, accessibility conditions, attribute values, and the sampling strategy. Clustering impacts statistical inference of area. The objective of the present paper is to propose a new approach to declustering methods using Kohonen network, Self-Organizing Maps (SOM). SOM are a type of artificial neural network used for unsupervised classification. The methodology assigns each sample a weight to calculate the declustered mean. The assignment of weight to each sample in an area is inversely proportional to the densely sampled in area. The declustered mean is given by the sum of the weight multiplication with the attribute value of each sample. Therefore, the logic of assigning weights is similar to Cell Declustering method, but the delimitation of the densified areas is different. SOM identifies areas with non-linear margins, unlike the Cell Declustering method. A case study is presented, using the Walker Lake data set. The present research is not intended to replace classical declustering methods, but rather to present a new approach to a routine problem in reserve evaluation. Although the mathematics of the applied technique is indeed complex, the results can be promising. [ABSTRACT FROM AUTHOR]

Published
2023
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7. Estimation of Reaction, Diffusion and Restitution Parameters for a 3D Myocardial Model Using Optical Mapping and MRI

Author

Relan, J., Pop, M., Delingette, H., Wright, G. A., Ayache, N., Sermesant, M., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Camara, Oscar, editor, Pop, Mihaela, editor, Rhode, Kawal, editor, Sermesant, Maxime, editor, Smith, Nic, editor, and Young, Alistair, editor

Published
2010
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8. LogDemons Revisited: Consistent Regularisation and Incompressibility Constraint for Soft Tissue Tracking in Medical Images

Author

Mansi, T., Pennec, X., Sermesant, M., Delingette, H., Ayache, N., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Jiang, Tianzi, editor, Navab, Nassir, editor, Pluim, Josien P. W., editor, and Viergever, Max A., editor

Published
2010
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9. Coupled Personalisation of Electrophysiology Models for Simulation of Induced Ischemic Ventricular Tachycardia

Author

Relan, J., Chinchapatnam, P., Sermesant, M., Rhode, K., Delingette, H., Razavi, R., Ayache, N., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Jiang, Tianzi, editor, Navab, Nassir, editor, Pluim, Josien P. W., editor, and Viergever, Max A., editor

Published
2010
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10. Clinical Evaluation of a Respiratory Gated Guidance System for Liver Punctures

Author

Nicolau, S. A., Pennec, X., Soler, L., Ayache, N., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Ayache, Nicholas, editor, Ourselin, Sébastien, editor, and Maeder, Anthony, editor

Published
2007
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12. Riemannian Elasticity: A Statistical Regularization Framework for Non-linear Registration

Author

Pennec, X., Stefanescu, R., Arsigny, V., Fillard, P., Ayache, N., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Duncan, James S., editor, and Gerig, Guido, editor

Published
2005
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13. A Complete Augmented Reality Guidance System for Liver Punctures: First Clinical Evaluation

Author

Nicolau, S. A., Pennec, X., Soler, L., Ayache, N., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Duncan, James S., editor, and Gerig, Guido, editor

Published
2005
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14. An Augmented Reality & Virtuality Interface for a Puncture Guidance System: Design and Validation on an Abdominal Phantom

Author

Nicolau, S., Schmid, J., Pennec, X., Soler, L., Ayache, N., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Yang, Guang-Zhong, editor, and Jiang, Tian-Zi, editor

Published
2004
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24. Towards Model-Based Estimation of the Cardiac Electro-Mechanical Activity from ECG Signals and Ultrasound Images

Author

Ayache, N., Chapelle, D., Clément, F., Coudière, Y., Delingette, H., Désidéri, J. A., Sermesant, M., Sorine, M., Urquiza, J. M., Goos, Gerhard, editor, Hartmanis, Juris, editor, van Leeuwen, Jan, editor, Katila, Toivo, editor, Nenonen, Jukka, editor, Magnin, Isabelle E., editor, Clarysse, Patrick, editor, and Montagnat, Johan, editor

Published
2001
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37. Certified Complexity

Author

Armadio, R., Asperti, A., Ayache, N., Campbell, B., Mulligan, D., Pollack, R., Regis-Gianas, Y., Coen, C. Sacerdoti, and Stark, I.

Published
2011
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39. Understanding the mechanisms amenable to CRT response: from pre-operative multimodal image data to patient-specific computational models

Author

Tobon-Gomez, C., Duchateau, N., Sebastian, R., Marchesseau, S., Camara, O., Donal, E., De Craene, M., Pashaei, A., Relan, J., Steghofer, M., Lamata, P., Delingette, H., Duckett, S., Garreau, M., Hernandez, A., Rhode, K. S., Sermesant, M., Ayache, N., Leclercq, C., Razavi, R., Smith, N. P., and Frangi, A. F.

Published
2013
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48. Spherical demons: fast diffeomorphic landmark-free surface registration

Author

Yeo, B.T.T., Golland, P., Fischl, B., Ayache, N., Vercauteren, T., and Sabuncu, M.R.

Subjects
Diagnostic imaging -- Research, Spline theory -- Analysis, Interpolation -- Usage, Cerebral cortex -- Structure, Business, Electronics, Electronics and electrical industries, Health care industry
Published
2010

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