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Author | Debora Gil; Oriol Rodriguez-Leor; Petia Radeva; J. Mauri | ||||
Title | Myocardial Perfusion Characterization From Contrast Angiography Spectral Distribution | Type | Journal Article | ||
Year | 2008 | Publication | IEEE Transactions on Medical Imaging | Abbreviated Journal | |
Volume | 27 | Issue | 5 | Pages | 641-649 |
Keywords | Contrast angiography; myocardial perfusion; spectral analysis. | ||||
Abstract | Despite recovering a normal coronary flow after acute myocardial infarction, percutaneous coronary intervention does not guarantee a proper perfusion (irrigation) of the infarcted area. This damage in microcirculation integrity may detrimentally affect the patient survival. Visual assessment of the myocardium opacification in contrast angiography serves to define a subjective score of the microcirculation integrity myocardial blush analysis (MBA). Although MBA correlates with patient prognosis its visual assessment is a very difficult task that requires of a highly expertise training in order to achieve a good intraobserver and interobserver agreement. In this paper, we provide objective descriptors of the myocardium staining pattern by analyzing the spectrum of the image local statistics. The descriptors proposed discriminate among the different phenomena observed in the angiographic sequence and allow defining an objective score of the myocardial perfusion. | ||||
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IAM;MILAB | Approved | no | ||
Call Number | IAM @ iam @ GRR2008 | Serial | 1541 | ||
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Author | Aura Hernandez-Sabate; Debora Gil; Petia Radeva | ||||
Title | On the usefulness of supervised learning for vessel border detection in IntraVascular Imaging | Type | Conference Article | ||
Year | 2005 | Publication | Proceeding of the 2005 conference on Artificial Intelligence Research and Development | Abbreviated Journal | |
Volume | Issue | Pages | 67-74 | ||
Keywords | classification; vessel border modelling; IVUS | ||||
Abstract | IntraVascular UltraSound (IVUS) imaging is a useful tool in diagnosis of cardiac diseases since sequences completely show the morphology of coronary vessels. Vessel borders detection, especially the external adventitia layer, plays a central role in morphological measures and, thus, their segmentation feeds development of medical imaging techniques. Deterministic approaches fail to yield optimal results due to the large amount of IVUS artifacts and vessel borders descriptors. We propose using classification techniques to learn the set of descriptors and parameters that best detect vessel borders. Statistical hypothesis test on the error between automated detections and manually traced borders by 4 experts show that our detections keep within inter-observer variability. | ||||
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Publisher | IOS Press | Place of Publication | Amsterdam, The Netherlands | Editor | |
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IAM;MILAB | Approved | no | ||
Call Number | IAM @ iam @ HGR2005c | Serial | 1549 | ||
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Author | Aura Hernandez-Sabate; David Rotger; Debora Gil | ||||
Title | Image-based ECG sampling of IVUS sequences | Type | Conference Article | ||
Year | 2008 | Publication | Proc. IEEE Ultrasonics Symp. IUS 2008 | Abbreviated Journal | |
Volume | Issue | Pages | 1330-1333 | ||
Keywords | Longitudinal Motion; Image-based ECG-gating; Fourier analysis | ||||
Abstract | Longitudinal motion artifacts in IntraVascular UltraSound (IVUS) sequences hinders a properly 3D reconstruction and vessel measurements. Most of current techniques base on the ECG signal to obtain a gated pullback without the longitudinal artifact by using a specific hardware or the ECG signal itself. The potential of IVUS images processing for phase retrieval still remains little explored. In this paper, we present a fast forward image-based algorithm to approach ECG sampling. Inspired on the fact that maximum and minimum lumen areas are related to end-systole and end-diastole, our cardiac phase retrieval is based on the analysis of tissue density of mass along the sequence. The comparison between automatic and manual phase retrieval (0.07 ± 0.07 mm. of error) encourages a deep validation contrasting with ECG signals. | ||||
Address | Beijing (China) | ||||
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IAM;MILAB | Approved | no | ||
Call Number | IAM @ iam @ HRG2008 | Serial | 1553 | ||
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Author | Oriol Rodriguez-Leor; A. Carol; H. Tizon; Eduard Fernandez-Nofrerias; J. Mauri; Vicente del Valle; Debora Gil; Aura Hernandez-Sabate; Petia Radeva | ||||
Title | Model estadístic-determinístic per la segmentació de l adventicia en imatges d ecografía intracoronaria | Type | Journal Article | ||
Year | 2005 | Publication | Rev Societat Catalana Cardiologia | Abbreviated Journal | |
Volume | 5 | Issue | Pages | 41 | |
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IAM;MILAB | Approved | no | ||
Call Number | IAM @ iam @ RCT2005 | Serial | 1637 | ||
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Author | Oriol Rodriguez-Leor; J. Mauri; Eduard Fernandez-Nofrerias; C. Garcia; R. Villuendas; Vicente del Valle; Debora Gil; Petia Radeva | ||||
Title | Reconstruction of a spatio-temporal model of the intima layer from intravascular ultrasound sequences | Type | Journal Article | ||
Year | 2003 | Publication | European Heart Journal | Abbreviated Journal | |
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Area | Expedition | Conference | ESC Congress | ||
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IAM;MILAB | Approved | no | ||
Call Number | IAM @ iam @ RMF2003c | Serial | 1641 | ||
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Author | Oriol Rodriguez-Leor; J. Mauri; Eduard Fernandez-Nofrerias; Antonio Tovar; Vicente del Valle; Aura Hernandez-Sabate; Debora Gil; Petia Radeva | ||||
Title | Utilización de la Estructura de los Campos Vectoriales para la Detección de la Adventicia en Imágenes de Ecografía Intracoronaria | Type | Journal Article | ||
Year | 2004 | Publication | Revista Internacional de Enfermedades Cardiovasculares Revista Española de Cardiología | Abbreviated Journal | |
Volume | 57 | Issue | 2 | Pages | 100 |
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Area | Expedition | Conference | SEC | ||
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IAM;MILAB | Approved | no | ||
Call Number | IAM @ iam @ RMF2004 | Serial | 1642 | ||
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Author | Oriol Rodriguez-Leor; Eduard Fernandez-Nofrerias; J. Mauri; Vicente del Valle; Debora Gil; A.Barrios; E.Garcia; Petia Radeva | ||||
Title | Perfusion ratio: A new tool to objectively assess microcirculation perfusion after primary Percutaneous Coronary Intervention | Type | Conference Article | ||
Year | 2006 | Publication | World Congress of Cardiology | Abbreviated Journal | |
Volume | Issue | Pages | 859 | ||
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Publisher | Place of Publication | Barcelona (Spain) | Editor | ||
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IAM;MILAB | Approved | no | ||
Call Number | IAM @ iam @ RFM2006c | Serial | 1643 | ||
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Author | Oriol Rodriguez-Leor; J. Mauri; Eduard Fernandez-Nofrerias; Vicente de Valle; E. Garcia; A. Barrios; Debora Gil; Petia Radeva | ||||
Title | Analysis of the changes in angiography local grey-level values to determine myocardial perfusion | Type | Conference Article | ||
Year | 2006 | Publication | World Congress of Cardiology | Abbreviated Journal | |
Volume | Issue | Pages | 862 | ||
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Publisher | Place of Publication | Barcelona (Spain) | Editor | ||
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IAM;MILAB | Approved | no | ||
Call Number | IAM @ iam @ RMF2006 | Serial | 1644 | ||
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Author | Misael Rosales; Petia Radeva; Oriol Rodriguez; Debora Gil | ||||
Title | Suppression of IVUS Image Rotation. A Kinematic Approach | Type | Book Chapter | ||
Year | 2005 | Publication | Functional Imaging and Modeling of the Heart | Abbreviated Journal | LNCS |
Volume | 3504 | Issue | Pages | 889-892 | |
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Abstract | IntraVascular Ultrasound (IVUS) is an exploratory technique used in interventional procedures that shows cross section images of arteries and provides qualitative information about the causes and severity of the arterial lumen narrowing. Cross section analysis as well as visualization of plaque extension in a vessel segment during the catheter imaging pullback are the technique main advantages. However, IVUS sequence exhibits a periodic rotation artifact that makes difficult the longitudinal lesion inspection and hinders any segmentation algorithm. In this paper we propose a new kinematic method to estimate and remove the image rotation of IVUS images sequences. Results on several IVUS sequences show good results and prompt some of the clinical applications to vessel dynamics study, and relation to vessel pathology. | ||||
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Publisher | Springer Berlin / Heidelberg | Place of Publication | Editor | Frangi, Alejandro and Radeva, Petia and Santos, Andres and Hernandez, Monica | |
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Lecture Notes in Computer Science | Abbreviated Series Title | LNCS | |
Series Volume | 3504 | Series Issue | Edition | ||
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IAM;MILAB | Approved | no | ||
Call Number | IAM @ iam @ RRR2005 | Serial | 1645 | ||
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Author | Misael Rosales; Petia Radeva; Oriol Rodriguez-Leor; Debora Gil | ||||
Title | Modelling of image-catheter motion for 3-D IVUS | Type | Journal Article | ||
Year | 2009 | Publication | Medical image analysis | Abbreviated Journal | MIA |
Volume | 13 | Issue | 1 | Pages | 91-104 |
Keywords | Intravascular ultrasound (IVUS); Motion estimation; Motion decomposition; Fourier | ||||
Abstract | Three-dimensional intravascular ultrasound (IVUS) allows to visualize and obtain volumetric measurements of coronary lesions through an exploration of the cross sections and longitudinal views of arteries. However, the visualization and subsequent morpho-geometric measurements in IVUS longitudinal cuts are subject to distortion caused by periodic image/vessel motion around the IVUS catheter. Usually, to overcome the image motion artifact ECG-gating and image-gated approaches are proposed, leading to slowing the pullback acquisition or disregarding part of IVUS data. In this paper, we argue that the image motion is due to 3-D vessel geometry as well as cardiac dynamics, and propose a dynamic model based on the tracking of an elliptical vessel approximation to recover the rigid transformation and align IVUS images without loosing any IVUS data. We report an extensive validation with synthetic simulated data and in vivo IVUS sequences of 30 patients achieving an average reduction of the image artifact of 97% in synthetic data and 79% in real-data. Our study shows that IVUS alignment improves longitudinal analysis of the IVUS data and is a necessary step towards accurate reconstruction and volumetric measurements of 3-D IVUS. | ||||
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IAM;MILAB | Approved | no | ||
Call Number | IAM @ iam @ RRR2009 | Serial | 1646 | ||
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Author | Oriol Pujol; Debora Gil; Petia Radeva | ||||
Title | Fundamentals of Stop and Go active models | Type | Journal Article | ||
Year | 2005 | Publication | Image and Vision Computing | Abbreviated Journal | |
Volume | 23 | Issue | 8 | Pages | 681-691 |
Keywords | Deformable models; Geodesic snakes; Region-based segmentation | ||||
Abstract | An efficient snake formulation should conform to the idea of picking the smoothest curve among all the shapes approximating an object of interest. In current geodesic snakes, the regularizing curvature also affects the convergence stage, hindering the latter at concave regions. In the present work, we make use of characteristic functions to define a novel geodesic formulation that decouples regularity and convergence. This term decoupling endows the snake with higher adaptability to non-convex shapes. Convergence is ensured by splitting the definition of the external force into an attractive vector field and a repulsive one. In our paper, we propose to use likelihood maps as approximation of characteristic functions of object appearance. The better efficiency and accuracy of our decoupled scheme are illustrated in the particular case of feature space-based segmentation. | ||||
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Publisher | Butterworth-Heinemann | Place of Publication | Newton, MA, USA | Editor | |
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Series Volume | Series Issue | Edition | |||
ISSN | 0262-8856 | ISBN | Medium | ||
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IAM;MILAB;HuPBA | Approved | no | ||
Call Number | IAM @ iam @ PGR2005 | Serial | 1629 | ||
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Author | David Rotger; Misael Rosales; Jaume Garcia; Oriol Pujol ; J. Mauri; Petia Radeva | ||||
Title | Active Vessel: A New Multimedia Workstation for Intravascular Ultrasound and Angiography Fusion | Type | Journal Article | ||
Year | 2003 | Publication | Computers in Cardiology | Abbreviated Journal | |
Volume | 30 | Issue | Pages | 65-68 | |
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Abstract | AcriveVessel is a new multimedia workstation which enables the visualization, acquisition and handling of both image modalities, on- and ofline. It enables DICOM v3.0 decompression and browsing, video acquisition,repmduction and storage for IntraVascular UltraSound (IVUS) and angiograms with their corresponding ECG,automatic catheter segmentation in angiography images (using fast marching algorithm). BSpline models definition for vessel layers on IVUS images sequence and an extensively validated tool to fuse information. This approach defines the correspondence of every IVUS image with its correspondent point in the angiogram and viceversa. The 3 0 reconstruction of the NUS catheterhessel enables real distance measurements as well as threedimensional visualization showing vessel tortuosity in the space. | ||||
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IAM;MILAB;HuPBA | Approved | no | ||
Call Number | IAM @ iam @ RRG2003 | Serial | 1647 | ||
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Author | Sergio Vera; Debora Gil; Agnes Borras; F. Javier Sanchez; Frederic Perez; Marius G. Linguraru; Miguel Angel Gonzalez Ballester | ||||
Title | Computation and Evaluation of Medial Surfaces for Shape Representation of Abdominal Organs | Type | Book Chapter | ||
Year | 2012 | Publication | Workshop on Computational and Clinical Applications in Abdominal Imaging | Abbreviated Journal | |
Volume | 7029 | Issue | Pages | 223–230 | |
Keywords | medial manifolds, abdomen. | ||||
Abstract | Medial representations are powerful tools for describing and parameterizing the volumetric shape of anatomical structures. Existing methods show excellent results when applied to 2D
objects, but their quality drops across dimensions. This paper contributes to the computation of medial manifolds in two aspects. First, we provide a standard scheme for the computation of medial manifolds that avoid degenerated medial axis segments; second, we introduce an energy based method which performs independently of the dimension. We evaluate quantitatively the performance of our method with respect to existing approaches, by applying them to synthetic shapes of known medial geometry. Finally, we show results on shape representation of multiple abdominal organs, exploring the use of medial manifolds for the representation of multi-organ relations. |
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Address | Toronto; Canada; | ||||
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Publisher | Springer Link | Place of Publication | Berlin | Editor | H. Yoshida et al |
Language | English | Summary Language | English | Original Title | |
Series Editor | Series Title | Lecture Notes in Computer Science | Abbreviated Series Title | LNCS | |
Series Volume | Series Issue | Edition | |||
ISSN | 0302-9743 | ISBN | 978-3-642-28556-1 | Medium | |
Area | Expedition | Conference | ABDI | ||
Notes ![]() |
IAM;MV | Approved | no | ||
Call Number | IAM @ iam @ VGB2012 | Serial | 1834 | ||
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Author | Carles Sanchez | ||||
Title | Tracheal ring detection in bronchoscopy | Type | Report | ||
Year | 2011 | Publication | CVC Technical Report | Abbreviated Journal | |
Volume | 168 | Issue | Pages | ||
Keywords | Bronchoscopy, tracheal ring, segmentation | ||||
Abstract | Endoscopy is the process in which a camera is introduced inside a human.
Given that endoscopy provides realistic images (in contrast to other modalities) and allows non-invase minimal intervention procedures (which can aid in diagnosis and surgical interventions), its use has spreaded during last decades. In this project we will focus on bronchoscopic procedures, during which the camera is introduced through the trachea in order to have a diagnostic of the patient. The diagnostic interventions are focused on: degree of stenosis (reduction in tracheal area), prosthesis or early diagnosis of tumors. In the first case, assessment of the luminal area and the calculation of the diameters of the tracheal rings are required. A main limitation is that all the process is done by hand, which means that the doctor takes all the measurements and decisions just by looking at the screen. As far as we know there is no computational framework for helping the doctors in the diagnosis. This project will consist of analysing bronchoscopic videos in order to extract useful information for the diagnostic of the degree of stenosis. In particular we will focus on segmentation of the tracheal rings. As a result of this project several strategies (for detecting tracheal rings) had been implemented in order to compare their performance. |
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Corporate Author | Thesis | Master's thesis | |||
Publisher | Place of Publication | Editor | Debora Gil, F.Javier Sanchez | ||
Language | english | Summary Language | english | Original Title | |
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IAM;MV | Approved | no | ||
Call Number | IAM @ iam @ San2011 | Serial | 1841 | ||
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Author | Carles Sanchez; Debora Gil; Antoni Rosell; Albert Andaluz; F. Javier Sanchez | ||||
Title | Segmentation of Tracheal Rings in Videobronchoscopy combining Geometry and Appearance | Type | Conference Article | ||
Year | 2013 | Publication | Proceedings of the International Conference on Computer Vision Theory and Applications | Abbreviated Journal | |
Volume | 1 | Issue | Pages | 153--161 | |
Keywords | Video-bronchoscopy, tracheal ring segmentation, trachea geometric and appearance model | ||||
Abstract | Videobronchoscopy is a medical imaging technique that allows interactive navigation inside the respiratory pathways and minimal invasive interventions. Tracheal procedures are ordinary interventions that require measurement of the percentage of obstructed pathway for injury (stenosis) assessment. Visual assessment of stenosis in videobronchoscopic sequences requires high expertise of trachea anatomy and is prone to human error. Accurate detection of tracheal rings is the basis for automated estimation of the size of stenosed trachea. Processing of videobronchoscopic images acquired at the operating room is a challenging task due to the wide range of artifacts and acquisition conditions. We present a model of the geometric-appearance of tracheal rings for its detection in videobronchoscopic videos. Experiments on sequences acquired at the operating room, show a performance close to inter-observer variability | ||||
Address | Barcelona; February 2013 | ||||
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Publisher | SciTePress | Place of Publication | Portugal | Editor | Sebastiano Battiato and José Braz |
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | LNCS | ||
Series Volume | Series Issue | Edition | |||
ISSN | ISBN | 978-989-8565-47-1 | Medium | ||
Area | 800 | Expedition | Conference | VISAPP | |
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IAM;MV; 600.044; 600.047; 600.060; 605.203 | Approved | no | ||
Call Number | IAM @ iam @ SGR2013 | Serial | 2123 | ||
Permanent link to this record |