Filters








489 Hits in 6.9 sec

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-  ...  Lan for their help on cardiac anatomical knowledge and manual segmentation.  ...  [8] presented a 3-D active shape model for semi-automatic segmentation of cardiac CT and MR volumes. A fuzzy c-means based fuzzy inference system was incorporated into the model.  ... 
doi:10.1186/s12938-017-0323-1 pmid:28351368 pmcid:PMC5370472 fatcat:s7fn53pspncnrgujmchwgeczqq

Accuracy and usefulness of fusion imaging between three-dimensional coronary sinus and coronary veins computed tomographic images with projection images obtained using fluoroscopy

A. Auricchio, A. Sorgente, E. Soubelet, F. Regoli, G. Spinucci, R. Vaillant, F. F. Faletra, C. Klersy, T. Moccetti
2009 Europace  
A transformation to align their projections seen on fluoroscopy with each respective structure segmented in the 3D-CT model was applied.  ...  register the 3D CT model with the fluoroscopy images.  ...  Funding The Cardiocentro Ticino has received a research grant from GE.  ... 
doi:10.1093/europace/eup237 pmid:19726445 fatcat:2xcurma72vb5rkkxq7h73idjly

Cardiac left atrium CT image segmentation for ablation guidance

M.M.J. Koppert, P.M.J. Rongen, M. Prokop, B.M. ter Haar Romeny, H.C. van Assen
2010 2010 IEEE International Symposium on Biomedical Imaging: From Nano to Macro  
It includes both endocardial and epicardial atrial wall segmentation on CT image data. Segmentation is based on active contours, Otsu's multiple threshold method and hysteresis thresholding.  ...  Segmentation results were compared to contours manually drawn by two experts, using repeated measures analysis of variance.  ...  The images were acquired with a CT angiography (CTA) protocol and thus not specifically made for analyzing the left atrium.  ... 
doi:10.1109/isbi.2010.5490304 dblp:conf/isbi/KoppertRPRA10 fatcat:lt7jtorvjneetawtw3ibts2kpu

Evaluation of 3D guided electroanatomic mapping for ablation of atrial fibrillation in reference to CT-Scan image integration

Christian de Chillou, Marius Andronache, Ahmed Abdelaal, Yves Ernst, Isabelle Magnin-Poull, Mohamed Magdi, Ning Zhang, Samuel Tissier, Damien Mandry, Cécile Barbary, Denis Régent, Etienne Aliot
2008 Journal of interventional cardiac electrophysiology  
This study investigates whether this postulation is accurate using CT scan image integration.  ...  Anatomical guided atrial fibrillation (AF) catheter ablation relies on the assumption that the left atrium reconstruction anatomy (LARA) using a 3D mapping system precisely matches the patient's CT scan  ...  This study investigates whether this postulation is accurate using CT scan image integration.  ... 
doi:10.1007/s10840-008-9300-8 pmid:18821007 fatcat:2sbxi6ecuzevbc7exzeu3x7wvm

Computer Vision Techniques for Transcatheter Intervention

Feng Zhao, Xianghua Xie, Matthew Roach
2015 IEEE Journal of Translational Engineering in Health and Medicine  
In all the phases (preoperative, intraoperative, and postoperative) during the transcatheter intervention procedure, computer vision techniques (e.g., image segmentation and motion tracking) have been  ...  In this paper, we present a systematical review on these state-of-the-art methods.  ...  FIGURE 27 . 27 Segmentation of ventricle borders in cardiac MRI images. FIGURE 28 . 28 Extraction of atrium contours in a large CT volume.  ... 
doi:10.1109/jtehm.2015.2446988 pmid:27170893 pmcid:PMC4848047 fatcat:kgkprfayx5arxbyacbubjrbbhy

Accurate Segmentation of the Left Ventricle in Computed Tomography Images for Local Wall Thickness Assessment [chapter]

J. Peters, J. Lessick, R. Kneser, I. Wächter, M. Vembar, O. Ecabert, J. Weese
2010 Lecture Notes in Computer Science  
In recent years, the fully automatic segmentation of the whole heart from three-dimensional (3D) CT or MR images has become feasible with mean surface accuracies in the order of 1mm.  ...  The percentage of local outliers with segmentation errors > 2mm is reduced by a factor of 3 as compared to a previously published approach.  ...  D converts the percentage p into a distance Model for Accurate LV Segmentation Reference Segmentations and Shape Model Segmentations of 67 image volumes from 33 patients at different cardiac phases  ... 
doi:10.1007/978-3-642-15705-9_49 fatcat:bwkdi4hasffb3nj25a62232doe

Intra-operative Volume Imaging of the Left Atrium and Pulmonary Veins with Rotational X-Ray Angiography [chapter]

Robert Manzke, Vivek Y. Reddy, Sandeep Dalal, Annemarie Hanekamp, Volker Rasche, Raymond C. Chan
2006 Lecture Notes in Computer Science  
We present a novel application of contrast-enhanced rotational X-ray imaging for CT-like reconstruction of 3D LAPV anatomy during the intervention itself.  ...  Complex electrophysiology (EP) procedures, such as catheter-based ablation in the left atrium and pulmonary veins (LAPV) for treatment of atrial fibrillation, require knowledge of heart chamber anatomy  ...  Finally, improvements in segmentation tools for automated surface model extraction will be explored.  ... 
doi:10.1007/11866565_74 fatcat:wxeqatqfpzgcxmjit7wxgbi24q

Towards automatic full heart segmentation in computed-tomography images

O. Ecabert, J. Peters, C. Lorenz, J. von Berg, M. Vembar, K. Subramanyan, G. Lavi, J. Weese
2005 Computers in Cardiology, 2005  
We present a robust, fast and fully automatic approach enabling the segmentation of the main anatomical structures of the heart in CT images.  ...  The proposed method is based on the adaptation of a 3D triangulated mesh to new unknown images exploiting simultaneously knowledge of organ shape and typical gray level appearance in images, both learned  ...  Discussion and conclusions In this article, we introduced a model-based approach to automatically and robustly segment the heart in CT images.  ... 
doi:10.1109/cic.2005.1588077 fatcat:6dfp5dd26jhnxjfgwok24utpna

Nonrigid Registration Regularized by Shape Information: Application to Atlas Construction of Cardiac CT Images

Yunfei Zha, Xuesong Lu, Li Wang, Rongqian Yang, Shanxing Ou, Dong Xing, Defeng Wang, Jian Yang
2015 PLoS ONE  
In this paper, we propose a new nonrigid registration algorithm incorporating shape information, to produce comprehensive atlases.  ...  Additionally, the shape information of multiple-objects in images is incorporated into the cost function for registration.  ...  Manual segmentations of AO(Aorta), LV(Left Ventricle), LVM(Left Ventricle Myocardium), LA(Left Atrium), RV(Right Ventricle) Fig 3 . 3 Manual segmentation results of registration images. doi:10.1371/journal.pone  ... 
doi:10.1371/journal.pone.0130730 pmid:26111054 pmcid:PMC4482436 fatcat:lidhtkl63zbmlmxhpeus4qoxea

A knowledge-based cone-beam x-ray CT algorithm for dynamic volumetric cardiac imaging

Ge Wang, Shiying Zhao, Dominic Heuscher
2002 Medical Physics (Lancaster)  
In this paper, we develop a knowledge-based spiral/ helical multislice/cone-beam CT approach for dynamic volumetric cardiac imaging.  ...  The higher speed, thinner slice, and wider coverage with multislice/conebeam CT indicate a great potential for dynamic volumetric imaging, with cardiac CT studies being the primary example.  ...  ACKNOWLEDGMENTS This work was supported in part by grants from the Philips Medical Systems, the National Institutes of Health  ... 
doi:10.1118/1.1494989 pmid:12201428 fatcat:o2tew3pr6rgjvgjarf2higo4b4

Automated MSCT Analysis for Planning Left Atrial Appendage Occlusion Using Artificial Intelligence

Kilian Michiels, Eva Heffinck, Patricio Astudillo, Ivan Wong, Peter Mortier, Alessandra Maria Bavo, Matti Adam
2022 Journal of interventional cardiology  
These models were used independently or in combination to detect the anatomical ostium, the landing zone, the mitral valve annulus, and the fossa ovalis and to segment the left atrium (LA) and left atrial  ...  A fast and accurate AI-based workflow is proposed to automatically analyze MSCT images for planning LAAO.  ...  Acknowledgments is study is part of a project that has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement no. 945698.  ... 
doi:10.1155/2022/5797431 pmid:35571991 pmcid:PMC9068333 fatcat:2vrqgvi6q5d63d7v4eatujhady

Benchmark for Algorithms Segmenting the Left Atrium From 3D CT and MRI Datasets

Catalina Tobon-Gomez, Arjan J. Geers, Jochen Peters, Jurgen Weese, Karen Pinto, Rashed Karim, Mohammed Ammar, Abdelaziz Daoudi, Jan Margeta, Zulma Sandoval, Birgit Stender, Yefeng Zheng (+12 others)
2015 IEEE Transactions on Medical Imaging  
Segmentation of the LA from Magnetic Resonance Imaging (MRI) and Computed Tomography (CT) images is a complex problem.  ...  This manuscript also reports the results of the Left Atrial Segmentation Challenge (LASC) carried out at the STACOM'13 workshop, in conjunction with MICCAI'13.  ...  Blazevic for their very useful suggestions for the automatisation of the evaluation framework.  ... 
doi:10.1109/tmi.2015.2398818 pmid:25667349 fatcat:x6mkjar7cfdqfic6md5uzt2q6u

Image segmentation via adaptive K-mean clustering and knowledge-based morphological operations with biomedical applications

C.W. Chen, J. Luo, K.J. Parker
1998 IEEE Transactions on Image Processing  
This proposed technique has been successfully applied to a sequence of cardiac CT volumetric images to generate the volumes of left ventricle chambers at 16 consecutive temporal frames.  ...  Image segmentation remains one of the major challenges in image analysis, since image analysis tasks are often constrained by how well previous segmentation is accomplished.  ...  II. 3-D IMAGE DATA AND CARDIAC ANATOMY The 3-D image data used in this research are a sequence of CT volumetric images obtained from dynamic spatial reconstructor (DSR), a unique ultra-fast multislice  ... 
doi:10.1109/83.730379 pmid:18276234 fatcat:l2xtphfnxrhjddqvjt7yvetrdi

Computational Modeling of Cardiac Valve Function and Intervention

Wei Sun, Caitlin Martin, Thuy Pham
2014 Annual Review of Biomedical Engineering  
It is thus important to include accurate definitions of these structures and regional material properties in computational models.  ...  Nonetheless, for modeling convenience, the leaflets are often treated as a single-layer, homogeneous material in computational models (3-13).  ...  left atrium to obtain accurate MV flow fields.  ... 
doi:10.1146/annurev-bioeng-071813-104517 pmid:24819475 pmcid:PMC5481457 fatcat:6xm3pwmxqzf7fobw72snbdhfoq

Applications of MRI for diagnosis of cardiovascular diseases

R M MacMillan
1992 New Jersey medicine : the journal of the Medical Society of New Jersey  
Magnetic resonance imaging (MRI) acquires high spatial resolution images of the heart from any part of the cardiac cycle and in any planar configuration without use of contrast.  ...  Sequential images through the cardiac cycle can be viewed as a cine.  ...  sumptions regarding left ventricu- lar geometry.22 MRI has been shown to measure accurately left ventricular mass in the canine model using the gated spin-echo pulse sequence.”  ... 
pmid:1620490 fatcat:yy4t5ew3onha7bvf4m7hwddoyu
« Previous Showing results 1 — 15 out of 489 results