Elsa D. Angelini

Imperial College London

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Papers

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i-10 index

Research Trends

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Document Type

Co-Authors

Andrew F. Laine

Columbia University

124

Isabelle Bloch

Laboratoire Traitement et Communication de l’Information

Eric A. Hoffman

University of Iowa

R. Graham Barr

Columbia University Irving Medical Center

Jean‐Christophe Olivo‐Marín

Centre National de la Recherche Scientifique

Benjamin M. Smith

McGill University

Jie Yang

Columbia University

Jérémie Anquez

Theraclion (France)

Christine P. Hendon

Columbia University

Jamal Atif

Lamsade

Cooperative Institutions

Columbia University

134

Centre National de la Recherche Scientifique

106

Johns Hopkins University

Columbia University Irving Medical Center

Télécom Paris

Imperial College London

Harvard University

Inserm

Laboratoire Traitement et Communication de l’Information

University of California, Los Angeles

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Citation

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Influence of pregnancy stage and fetus position on the whole-body and local exposure of the fetus to RF-EMF

Physics in Medicine and Biology (2014)

Nadège Varsier Sonia Dahdouh Antoine Serrurier J-P De la Plata Jérémie Anquez

This paper analyzes the influence of pregnancy stage and fetus position on the whole-body and brain exposure of the fetus to radiofrequency electromagnetic fields. Our analysis is performed using semi-homogeneous pregnant woman models between 8 and 32 weeks of amenorrhea. By analyzing the influence of the pregnancy stage on the environmental whole-body and local exposure of a fetus in vertical position, head down or head up, in the 2100 MHz frequency band, we concluded that both whole-body and average brain exposures of the fetus decrease during the first pregnancy trimester, while they advance during the pregnancy due to the rapid weight gain of the fetus in these first stages. From the beginning of the second trimester, the whole-body and the average brain exposures are quite stable because the weight gains are quasi proportional to the absorbed power increases.

Fetal head

Body position

Position (finance)

10.1088/0031-9155/59/17/4913

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Citations (19)

Variational segmentation framework in prolate spheroidal coordinates for 3D real-time echocardiography

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2006)

Bruno Vallet Elsa D. Angelini Andrew F. Laine

This paper presents a new formulation of a deformable model segmentation in prolate spheroidal coordinates for segmentation of 3D cardiac echocardiography data. The prolate spheroidal coordinate system enables a representation of the segmented surface with descriptors specifically adapted to the "ellipsoidal" shape of the ventricle. A simple data energy term, based on gray-level information, guides the segmentation. The segmentation framework provides a very fast and simple algorithm to evolve an initial ellipsoidal object towards the endocardial surface of the myocardium with near real-time deformations. With near real-time performance, additional constraints on landmark points, can be used interactively to prevent leakage of the surface.

Ellipsoid

Representation

10.1117/12.653692

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Citations (10)

Whole-body pregnant woman modeling by digital geometry processing with detailed uterofetal unit based on medical images

IEEE Transactions on Biomedical Engineering (2010)

Lazar Bibin Jérémie Anquez Juan Pablo de la Plata Alcalde Tamy Boubekeur Elsa D. Angelini

Anatomical models of pregnant women are used in several applications, such as numerical dosimetry, to assess the potential effects of electromagnetic fields on biological tissues, or medical simulation. Recent advances in medical imaging have enabled the generation of realistic and detailed models of human beings. The construction of pregnant woman models remains a complex task, since it is not possible to acquire whole-body images. Only few models have been developed up to now, and they all present some limitations regarding the representation of anatomical variability of the fetus shape and position over the entire gestation. This paper describes a complete methodology that intends to automate each step of the construction of pregnant women models. The proposed approach relies on the segmentation of 3-D ultrasonic and 3-D magnetic resonance imaging (MRI) data, and on dedicated computer graphics tools. The lack of complete anatomical information for the mother in image data is compensated, in an original way, by merging the available information with a synthetic woman model, deformed to match the image-based information. A set of models anatomically validated by clinical experts is presented. They include detailed information on uterofetal units and cover different gestational stages with various fetal positions.

Representation

Solid modeling

10.1109/tbme.2010.2053367

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Citations (51)

Video reconstruction usung compressed sensing measurements and 3D Total Variation regularization for bio-imaging applications

HAL (Le Centre pour la Communication Scientifique Directe) (2012)

Yoann Le Montagner Elsa D. Angelini J.-C. Olivo-Marin

Regularization

Total variation denoising

Variation (astronomy)

Source

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Citations (0)

Toward Noninvasive Quantification of Brain Radioligand Binding by Combining Electronic Health Records and Dynamic PET Imaging Data

IEEE Journal of Biomedical and Health Informatics (2015)

Arthur Mikhno Francesca Zanderigo R. Todd Ogden J. John Mann Elsa D. Angelini

Quantitative analysis of positron emission tomography (PET) brain imaging data requires a metabolite-corrected arterial input function (AIF) for estimation of distribution volume and related outcome measures. Collecting arterial blood samples adds risk, cost, measurement error, and patient discomfort to PET studies. Minimally invasive AIF estimation is possible with simultaneous estimation (SIME), but at least one arterial blood sample is necessary. In this study, we describe a noninvasive SIME (nSIME) approach that utilizes a pharmacokinetic input function model and constraints derived from machine learning applied to an electronic health record database consisting of "long tail" data (digital records, paper charts, and handwritten notes) that were collected ancillary to the PET studies. We evaluated the performance of nSIME on 95 [ ¹¹ C]DASB PET scans that had measured AIFs. The results indicate that nSIME is a promising alternative to invasive AIF measurement. The general framework presented here may be expanded to other metabolized radioligands, potentially enabling quantitative analysis of PET studies without blood sampling. A glossary of technical abbreviations is provided at the end of this paper.

Radioligand

Health records

10.1109/jbhi.2015.2416251

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Citations (10)

Assessment of visual quality and spatial accuracy of fast anisotropic diffusion and scan conversion algorithms for real-time three-dimensional spherical ultrasound

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2004)

Qi Duan Elsa D. Angelini Andrew F. Laine

Three-dimensional ultrasound machines based on matrix phased-array transducers are gaining predominance for real-time dynamic screening in cardiac and obstetric practice. These transducers array acquire three-dimensional data in spherical coordinates along lines tiled in azimuth and elevation angles at incremental depth. This study aims at evaluating fast filtering and scan conversion algorithms applied in the spherical domain prior to visualization into Cartesian coordinates for visual quality and spatial measurement accuracy. Fast 3d scan conversion algorithms were implemented and with different order interpolation kernels. Downsizing and smoothing of sampling artifacts were integrated in the scan conversion process. In addition, a denoising scheme for spherical coordinate data with 3d anisotropic diffusion was implemented and applied prior to scan conversion to improve image quality. Reconstruction results under different parameter settings, such as different interpolation kernels, scaling factor, smoothing options, and denoising, are reported. Image quality was evaluated on several data sets via visual inspections and measurements of cylinder objects dimensions. Error measurements of the cylinder's radius, reported in this paper, show that the proposed fast scan conversion algorithm can correctly reconstruct three-dimensional ultrasound in Cartesian coordinates under tuned parameter settings. Denoising via three-dimensional anisotropic diffusion was able to greatly improve the quality of resampled data without affecting the accuracy of spatial information after the modification of the introduction of a variable gradient threshold parameter.

Interpolation

Smoothing

10.1117/12.535813

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Citations (18)

An automated myocardial segmentation in cardiac MRI

Conference proceedings (2007)

R. El Berbari Isabelle Bloch Alban Redheuil Elsa D. Angelini Élie Mousseaux

In this paper we present an automatic approach to segment Cardiac Magnetic Resonance (CMR) images. A preprocessing step that consists in filtering the image using connected operators (area opening and closing filters) is applied in order to homogenize the cavity and solve the problems due to the papillary muscles. Thereby the GVF snake algorithm is applied with one point clicked in the cavity as initialization and an optimized tuning of parameters for the endocardial contour extraction. The epicardial border is then obtained using the endocardium as initialization. The performance of the proposed method was assessed by experimentation on thirty-nine CMR images. A high agreement between manual and automatic contours was obtained with correlation scores of 0.96 for the endocardium and 0.90 for the epicardium. Overlapping percentage, mean and maximum distances between the two contours show a good performance of the method.

Initialization

Endocardium

10.1109/iembs.2007.4353341

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Citations (32)

Validation of Combined Bronchitic-Apical Emphysema, A Novel CT Emphysema Subtype, Using Ultra-resolution Micro-CT Imaging

Dragoş M. Vasilescu Elsa D. Angelini Artur Wysoczanski Eric A. Hoffman Andrew F. Laine

Pulmonary emphysema

10.1164/ajrccm-conference.2024.209.1_meetingabstracts.a1252

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Citations (2)

VALIDATION OF OPTICAL-FLOW FOR QUANTIFICATION OF MYOCARDIAL DEFORMATIONS ON SIMULATED RT3D ULTRASOUND

Qi Duan Elsa D. Angelini Shunichi Homma Andrew F. Laine

Quantitative analysis of cardiac motion is of great clinical interest in assessing ventricular function. Real-time 3-D (RT3D) ultrasound transducers provide valuable four-dimensional information, from which quantitative measures of cardiac function can be extracted. Previously, we presented a method based on four-dimensional optical flow motion estimation for anatomical tracking of myocardium in RT3D ultrasound, from which myocardial displacement fields and dynamic cardiac metrics were computed. In this paper, in order to quantitatively validate our method, we build a truly 3D mathematical phantom of cardiac tissue and blood. Distinguished from previous studies, our work further decomposes tissue impedance into cell kernels and processes all functions in 3D. Instead of simply modeling the myocardium, a "quasi-LV" phantom is built including myocardium and blood. Also all ultrasound probe parameters used in this work are directly estimated from clinical RT3D data instead of using common parameters from 2D transducers. Based on this phantom, simulated RT3D ultrasound data sets are generated for validation to assess the performance of an optical flow based method in tracking myocardial tissues.

Tracking (education)

Optical Flow

10.1109/isbi.2007.357009

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Citations (25)

Segmentation-free and multiscale-free extraction of medial information using gradient vector flow. Application to vascular structures

HAL (Le Centre pour la Communication Scientifique Directe) (2012)

Guillaume Pizaine Raphaël Prevost Elsa D. Angelini Isabelle Bloch S. Makram–Ebeid

Vector flow

Medial axis

Source

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Citations (1)