Filters








9,460 Hits in 7.7 sec

A 3D Statistical Shape Model for the Left Ventricle of the Heart [chapter]

Hui Luo, Thomas O'Donnell
2001 Lecture Notes in Computer Science  
We propose a method for creating a 3-D statistical shape model of the left ventricle from sets of sparse 2-D contour inputs.  ...  Included is a measure of confidence in these created landmarks. Statistics on the model shape are garnered via principal component analysis.  ...  In this paper we describe a method for developing a statistical shape model of the left ventricle (LV) of the heart.  ... 
doi:10.1007/3-540-45468-3_203 fatcat:hzpffgs4p5fnfi45eqb3a423ne

Improving Segmentation of the Left Ventricle Using a Two-Component Statistical Model [chapter]

Sebastian Zambal, Jiří Hladůvka, Katja Bühler
2006 Lecture Notes in Computer Science  
We interconnect a set of 2D AAMs by a 3D shape model. We show that our approach is able to cope with imperfect data and improves segmentations by 11% on average compared to 3D AAMs.  ...  Quality of segmentations obtained by 3D Active Appearance Models (AAMs) crucially depends on underlying training data.  ...  A Two-Component Model of the Left Ventricle Inspired by the idea of modeling global and local features separately [1, 8] we propose to combine a set of local 2D AAMs with a global 3D shape model.  ... 
doi:10.1007/11866565_19 fatcat:n4adrwsekrh3dhk6x6b67iajnq

Modeling Of Blood Flow Velocity Into The Main Artery Via Left Ventricle Of Heart During Steady Condition

Mohd Azrul Hisham Mohd Adib, Nur Hazreen Mohd Hasni
2012 Zenodo  
A three-dimensional and pulsatile blood flow in the left ventricle of heart model has been studied numerically.  ...  In this study, simulation was used to investigate the pattern of flow velocity in 3D model of heart with consider the left ventricle based on critical parameter of blood under steady condition.  ...  The authors of this paper also would like to express their gratitude to Hospital Tengku Ampuan Afzan (HTAA) for supporting these research activities.  ... 
doi:10.5281/zenodo.1084587 fatcat:cvmo32i4h5cq5jvj4cl2kd3lk4

Transthoracic three-dimensional echocardiographic reconstruction of left and right ventricles: In vitro validation and comparison with magnetic resonance imaging

Riccardo Pini, Giuseppe Giannazzo, Mauro Di Bari, Francesca Innocenti, Luigi Rega, Giancarlo Casolo, Richard B. Devereux
1997 American Heart Journal  
We compared in vitro the accuracy of a three-dimensional (3D) echocardiographic system suitable for transthoracic imaging to magnetic resonance imaging (MRI) in the measurement of left and right ventricular  ...  Thus in this in vitro model, 3D echocardiography exhibited greater accuracy than MRI. (Am Heart J 1997; 133:221-9.)  ...  The ultrasonic beam profile exhibited a regular shape along the entire depth used to visualize the heart, with a lateral resolution of 1.3 mm at -6 dB.  ... 
doi:10.1016/s0002-8703(97)70212-6 pmid:9023169 fatcat:dy3ja62qqrg3lbl2k2xtxknvou

Construction of Left Ventricle 3D Shape Atlas from Cardiac MRI [chapter]

Shaoting Zhang, Mustafa Uzunbas, Zhennan Yan, Mingchen Gao, Junzhou Huang, Dimitris N. Metaxas, Leon Axel
2011 Lecture Notes in Computer Science  
In this paper, we present an effective algorithm to construct a 3D shape atlas for the left ventricle of heart from cardiac Magnetic Resonance Image data.  ...  We also present modes of variation from the computed atlas for the control population, to show the shape and motion variability.  ...  Accurate 3D manual annotation, however, is difficult and time-consuming. In this paper, we propose a method for creating a 3D shape atlas of the left ventricle from 2D manual delineations.  ... 
doi:10.1007/978-3-642-21028-0_11 fatcat:aj7dh5mylvdkpi3yg2pgwom7te

From 2D to 4D in quantitative left ventricle wall motion analysis of biplanar X-ray angiograms

R. Swoboda, M. Carpella, C. Steinwender, C. Gabriel, F. Leisch, W. Backfrieder
2005 Computers in Cardiology, 2005  
The centerline and radial method, originally developed for analysis in 2D, are extended to 3D for assessment of cardiac motion based on our 4D ventricular model.  ...  Color-encoded ventricle models and 2D maps of heart wall dynamics are developed for visualization. Results obtained by using the methods presented herein are in correspondence with clinical findings.  ...  Acknowledgements This work was funded by Grant Wi(Ge)206490 of the State Government of Upper Austria.  ... 
doi:10.1109/cic.2005.1588272 fatcat:sauhuioo5ndgrkrh5erol3uxz4

Conditional Shape Models for Cardiac Motion Estimation [chapter]

Coert Metz, Nora Baka, Hortense Kirisli, Michiel Schaap, Theo van Walsum, Stefan Klein, Lisan Neefjes, Nico Mollet, Boudewijn Lelieveldt, Marleen de Bruijne, Wiro Niessen
2010 Lecture Notes in Computer Science  
We propose a conditional statistical shape model to predict patient specific cardiac motion from the 3D end-diastolic CTA scan.  ...  The prediction of motion from shape information is thus relevant for this purpose.  ...  Such a 4D statistical model was, for instance, built by Perperidis et al. for segmenting the left ventricle, right ventricle, and myocardium, but was not used for motion prediction [4] .  ... 
doi:10.1007/978-3-642-15705-9_55 fatcat:dgyzkwjnfvehdcswuhuiwikeci

Modeling and Representation of Human Hearts for Volumetric Measurement

Qiu Guan, Wanliang Wang, Guang Wu
2012 Computational and Mathematical Methods in Medicine  
The method is based on a flexible model trained from hundreds of patient image sets by a genetic algorithm, which takes advantage of complete segmentation of the heart shape to form a geometrical heart  ...  This paper investigates automatic construction of a three-dimensional heart model from a set of medical images, represents it in a deformable shape, and uses it to perform volumetric measurements.  ...  The program thus creates a trained model representing the general shape of the hearts. Figure 2 : 2 The B-spline surface model of a left ventricle.  ... 
doi:10.1155/2012/389463 pmid:22162723 pmcid:PMC3227230 fatcat:mt5dc5kyzvhhhh2etwsrxcpgwe

Construction of a 4D Statistical Atlas of the Cardiac Anatomy and Its Use in Classification [chapter]

Dimitrios Perperidis, Raad Mohiaddin, Daniel Rueckert
2005 Lecture Notes in Computer Science  
During the construction of the statistical atlas we eliminate the need for manual landmarking of the cardiac images by using a nonrigid surface registration algorithm to propagate a set of pseudo-landmarks  ...  In this paper we present a novel method for building a 4D statistical atlas describing the cardiac anatomy and how the cardiac anatomy changes during the cardiac cycle.  ...  These models describe the significant changes in the shape of the left ventricle, the myocardium due to subjects' different heart shape.  ... 
doi:10.1007/11566489_50 fatcat:37jj7343sfcclhgzcgfygf24dm

Segmentation of the left and right cardiac ventricle using a combined bi-temporal statistical model

Dominik Fritz, Daniel Rinck, Rüdiger Dillmann, Michael Scheuering, Kevin R. Cleary, Robert L. Galloway, Jr.
2006 Medical Imaging 2006: Visualization, Image-Guided Procedures, and Display  
These surfaces were used to build a mean triangular surface model of the left and right ventricle for the end-diastolic and end-systolic heart phase and to compute the PCA and ICA decorrelation matrices  ...  It is based on a combined bi-temporal statistical model of the left and right ventricle using the principal component analysis (PCA) as well as the independent component analysis (ICA) to model global  ...  We built a bi-temporal 3D cardiac statistical model which describes the left and the right ventricle for both cardiac phases in one model.  ... 
doi:10.1117/12.652991 dblp:conf/miigp/FritzRDS06 fatcat:rhmnebfoo5fqtetqm3f3kdylhi

Simultaneous Segmentation and Motion Recovery in 3D Cardiac Image Analysis [chapter]

Ling Zhuang, Huafeng Liu, Wei Chen, Hujun Bao, Pengcheng Shi
2005 Lecture Notes in Computer Science  
tracking of the spatiotemporal evolution of a 3D active region model driven by imaging data, statistical priors of the left ventricular boundaries, and cyclic motion models of the myocardial tissue elements  ...  In this paper, we present a continuum biomechanics model based framework that performs simultaneous segmentation and motion analysis of the left ventricle from 3D image sequences, achieved through the  ...  In this paper, we put forward a method of simultaneous segmentation and motion recovery of the left ventricle from 3D image sequences.  ... 
doi:10.1007/11569541_50 fatcat:2pn65jedvfe5ha4quhgn3hx46q

Anisotropic filtering for model-based segmentation of 4D cylindrical echocardiographic images

J Montagnat, M Sermesant, H Delingette, G Malandain, N Ayache
2003 Pattern Recognition Letters  
The reconstruction of the endocardium takes place by deforming a deformable simplex mesh having an a priori knowledge of left ventricle shape and that is guided by a region-based data attraction force.  ...  This paper presents a 4D (3D þ time) echocardiographic image anisotropic filtering and a 3D model-based segmentation system.  ...  Lethor, CHU Brabois. for providing the 3D ultrasound images used in this paper.  ... 
doi:10.1016/s0167-8655(02)00184-8 fatcat:qsu7h5qcmbasjhxqhikluwymum

Heart Modeling of Congenital Heart Disease Based on Neonatal Echocardiographic Images

Ryo HARAGUCHI, Megumi NAKAO, Ken-ichi KUROSAKI, Michiaki IWATA, Kazuo NAKAZAWA, Koji KAGISAKI, Isao SHIRAISHI
2014 Advanced Biomedical Engineering  
A heart model for research application could be constructed each time using a combination of selected elements to reproduce the behavior of interest.  ...  For example, it is not necessarily important to represent precise shape information. In this review, we present several applications of heart models.  ...  Heart modeling for clinical use Clinically, assessment of left ventricle (LV) contractile function is important in diagnosing heart diseases.  ... 
doi:10.14326/abe.3.86 fatcat:kcqcccop75hmfka2w4hrrea3d4

Nonrigid registration with corresponding points constraint for automatic segmentation of cardiac DSCT images

Xuesong Lu, Rongqian Yang, Qinlan Xie, Shanxing Ou, Yunfei Zha, Defeng Wang
2017 BioMedical Engineering OnLine  
The work described in this paper was partially supported by a grant from the Research Grants Council of the Hong Kong Special Administra-  ...  Acknowledgements The authors would like to thank Guangzhou General Hospital of Guangzhou Military Area Command for providing the images, L. Li and S. L.  ...  Shang introduced a novel scheme for the segmentation of 4-D MR cardiac images [10] . 3D spatially hierarchical expressions of the statistical shape models for the cardiac chambers were constructed through  ... 
doi:10.1186/s12938-017-0323-1 pmid:28351368 pmcid:PMC5370472 fatcat:s7fn53pspncnrgujmchwgeczqq

Relationship between body composition and left ventricular geometry using three dimensional cardiovascular magnetic resonance

Ben Corden, Antonio de Marvao, Timothy J. Dawes, Wenzhe Shi, Daniel Rueckert, Stuart A. Cook, Declan P. O'Regan
2016 Journal of Cardiovascular Magnetic Resonance  
Atlas-based segmentation and co-registration was used to create a statistical model of wall thickness (WT) and relative wall thickness (RWT) throughout the LV.  ...  The 3D models revealed that in males fat mass was strongly associated with a concentric increase in relative wall thickness (RWT) throughout most of the LV (β = 0.37, significant area = 96 %) and a reduced  ...  London, UK; British Heart Foundation project grant PG/12/27/29489, special grant SP/10/10/28431 and a Wellcome Trust-GSK Fellowship Grant (TJWD). 2 Department of Computing, Imperial College London,  ... 
doi:10.1186/s12968-016-0251-4 pmid:27245154 pmcid:PMC4888671 fatcat:z5y3fxcx7rb2bdwobzn5plfgui
« Previous Showing results 1 — 15 out of 9,460 results